abstract stringlengths 3 192k | title stringlengths 4 857 |
|---|---|
a wide bandwidth, dual polarized, modified four-square antenna is presented as a feed antenna for radio astronomical measurements. a linear array of these antennas is used as a line-feed for cylindrical reflectors for tianlai, a radio interferometer designed for 21cm intensity mapping. simulations of the feed antenna b... | simulation and testing of a linear array of modified four-square feed antennas for the tianlai cylindrical radio telescope |
significant contributions to low frequency radio astronomy were made in the australian state of tasmania after the arrival of grote reber in 1954. initially, reber teamed with graeme ellis, who was then working with the ionospheric prediction service, and they carried out observations as low as 0.52 mhz during the 1955... | the history of early low frequency radio astronomy in australia. 2: tasmania |
the calculation results of photographic and radar meteoroid mass of simultaneous radio - tv and radio-photographic observations of meteors in 1977-1980 in hissar astronomical observatory of the institute of astrophysics, academy of sciences of tajikistan. the analyses' results of the shape of light curves of meteors wi... | physical properties of the meteoroids using simultaneous radar and optical observations |
context. heterodyne mixers are commonly used for high-resolution spectroscopy at radio telescopes. when used as a double sideband system, the accurate flux calibration of spectral lines acquired by those detectors is highly dependent on the system gains in the respective mixer sidebands via the so-called sideband gain ... | derivation of sideband gain ratio for herschel/hifi |
the feasibility of expanding the evaluation parameters was discussed when selecting the "karadag" test site for the installation of millimeter-wave antennas based on the following: a comparative analysis of the data on the integral atmosphere moisture content in the time interval from august 2019 to january 2020 for th... | comparative analysis of the propagation conditions of millimeter radio waves at radio astronomy polygons in russia and uzbekistan |
this review arose from the european radio astronomy technical forum (eratec) meeting held in firenze, october 2015, and aims to highlight the breadth and depth of the high-impact science that will be aided and assisted by the use of simultaneous mm-wavelength receivers. recent results and opportunities are presented an... | the science case for simultaneous mm-wavelength receivers in radio astronomy |
in our effort to systematically study the far infrared (fir) spectra of asymmetrically mono deuterated methanol (ch2doh) and thereby obtain the transition wavenumbers with better and better accuracy (mukhopadhyay, 2016a,b), the complete fourier transform (ft) spectra from fir to infrared (ir) vibrational bands (in the ... | very high resolution far infrared synchrotron radiation spectrum of methanol-d1 (ch2doh) in the first three torsional-vibrational modes |
active galactic nucleus (agn) jets are believed to be important in solving the cooling flow problem in the intracluster medium (icm), while the detailed mechanism is still under debate. here we present a systematic study on the energy coupling efficiency ηcp, the fraction of agn jet energy transferred to the icm. we fi... | on the energy coupling efficiency of agn outbursts in galaxy clusters |
the askaryan radio array (ara) reports an observation of radio emission coincident with the "valentine's day" solar flare on feb. 15$^{\rm{th}}$, 2011 in the prototype "testbed" station. we find $\sim2000$ events that passed our neutrino search criteria during the 70 minute period of the flare, all of which reconstruct... | observation of reconstructable radio emission coincident with an x-class solar flare in the askaryan radio array prototype station |
this paper presents a survey of microwave front-end receivers installed at radio telescopes throughout the world. this unprecedented analysis was conducted as part of a review of front-end developments for italian radio telescopes, initiated by the italian national institute for astrophysics in 2016. fifteen internatio... | an international survey of front-end receivers and observing performance of telescopes for radio astronomy |
the development in africa with radio astronomy (dara) project, a joint venture between the uk, south africa and african partner nations, aims to provide development, education, training and careers advice to africans through radio astronomy and related technical disciplines. | uk aid for african radio astronomy |
recent all-sky and large-area astronomical surveys and their catalogued data over the whole range of electromagnetic spectrum, from γ -rays to radio waves, are reviewed, including such as fermi-glast and integral in γ -ray, rosat, xmm and chandra in x-ray, galex in uv, sdss and several poss i and poss ii-based catalogu... | astronomical surveys and big data |
the primary antenna elements and receivers are two of the most important components in a synthesis telescope. together they are responsible for locking onto an astronomical source in both direction and frequency, capturing its radiation, and converting it into signals suitable for digitization and correlation. the prop... | antennas and receivers in radio interferometry |
we characterize the low frequency radio-frequency interference (rfi) environment at the murchison radio-astronomy observatory (mro), the location selected for the low-frequency component of the square kilometre array. data were collected from the bighorns instrument, located at the mro, which records a contiguous bandw... | the statistics of low frequency radio interference at the murchison radio-astronomy observatory |
fast radio bursts (frbs) are mysterious astronomical radio transients with extremely short intrinsic duration. until now, the physical origins of them still remain elusive, especially for the nonrepeating frbs. strongly inspired by recent progress on possible evidence of earth-mass primordial black holes, we revisit th... | earth-mass primordial black hole mergers as sources for nonrepeating fast radio bursts |
frequency dissemination and synchronization in free space play an important role in global navigation satellite system, radio astronomy, and synthetic aperture radar. in this paper, we demonstrated a portable radio frequency dissemination scheme via free space using microwave antennas. the setup has a good environment ... | portable microwave frequency dissemination in free space and implications on ground-to-satellite synchronization |
an extensive search has been conducted to confirm transitions of trans-ethyl methyl ether (teme, c2h5och3), toward the high-mass star forming region w51 e1/e2 using the 12 m telescope of the arizona radio observatory at wavelengths from 2 mm and 3 mm. in short, we cannot confirm the detection of teme toward w51 e1/e2 a... | the search for a complex molecule in a selected hot core region: a rigorous attempt to confirm trans-ethyl methyl ether toward w51 e1/e2 |
in this work, we investigate the molecular gas and star-formation properties in the barred spiral galaxy ngc 6946 using multiple molecular lines and star-formation tracers. a high-resolution image (100 pc) of 13co (1-0) is created for the inner 2 kpc disk by the single-dish nobeyama radio observatory 45 m telescope and... | molecular gas and star-formation properties in the central and bar regions of ngc 6946 |
the zadko telescope is a 1 m f/4 cassegrain telescope, situated in the state of western australia about 80-km north of perth. the facility plays a niche role in australian astronomy, as it is the only meter class facility in australia dedicated to automated follow-up imaging of alerts or triggers received from differen... | the zadko telescope: exploring the transient universe |
context. methyl cyanide is an important trace molecule in space, especially in star-forming regions where it is one of the more common molecules used to derive kinetic temperatures.aims: we want to obtain accurate spectroscopic parameters of minor isotopologs of methyl cyanide in their lowest excited ν8 = 1 vibrational... | rotational spectra of isotopic species of methyl cyanide, ch3cn, in their v8 = 1 excited vibrational states |
the fourier domain acceleration search (fdas) is an effective technique for detecting faint binary pulsars in large radio astronomy data sets. this paper quantifies the sensitivity impact of reducing numerical precision in the graphics processing unit (gpu)-accelerated fdas pipeline of the astroaccelerate (aa) software... | bits missing: finding exotic pulsars using bfloat16 on nvidia gpus |
mobile communication towers represent a relatively new but growing contributor to the total radio-leakage associated with planet earth. we investigate the overall power contribution of mobile communication towers to the earth's radio leakage budget, as seen from a selection of different nearby stellar systems. we creat... | simulation of the earth's radio-leakage from mobile towers as seen from selected nearby stellar systems |
radio frequency interference (rfi) is a growing concern in the radio astronomy community. single-dish telescopes are particularly susceptible to rfi. several methods have been developed to cope with rf-polluted environments, based on flagging, excision, and real-time blanking, among others. all these methods produce so... | a fpga-based fast converging digital adaptive filter for real-time rfi mitigation on ground based radio telescopes |
a post-processing pipeline to adaptively extract and catalog astronomical sources has been developed to enhance the scientific value and accessibility of data products generated by the vla low-band ionosphere and transient experiment (vlite) on the karl g. jansky very large array (vla). in contrast to other radio sky s... | the vlite database pipeline |
astrophysical sources such as radio halos and relics in galaxy clusters, supernova remnants and radio galaxies have angular sizes from a few to several 10s of arcminutes. in radio interferometric imaging of such sources, the largest angular size of the source that can be imaged is limited by the shortest projected base... | simulations of imaging extended sources using the gmrt and the u-gmrt. implications to observing strategies |
context. we present the first public data release of the vista extension to auxiliary surveys (vexas), comprising nine cross-matched multi-wavelength photometric catalogues where each object has a match in at least two surveys.aims: our aim is to provide spatial coverage that is as uniform as possible in the multi-wave... | vexas: vista extension to auxiliary surveys. data release 1. the southern galactic hemisphere |
the gaia optical reference frame is intrinsically undefined with respect to global orientation and spin, so it needs to be anchored in the radio-based international celestial reference frame (icrf) to provide a referenced and quasi-inertial celestial coordinate system. the link between the two fundamental frames is rea... | functional principal component analysis of radio-optical reference frame tie |
a radio telescope placed in lunar orbit, or on the surface of the moon's farside, could be of great value to the search for extraterrestrial intelligence (seti). the advantage of such a telescope is that it would be shielded by the body of the moon from terrestrial sources of radio frequency interference (rfi). while r... | lunar opportunities for seti |
ten protostellar outflows in the orion molecular clouds were mapped in the 12co/13co j 6 5 and 12co j 7 6 lines. the maps of these mid-j co lines have an angular resolution of about 10 and a typical field size of about 100. the physical parameters of the molecular outflows were derived, including mass transfer rates, k... | mid-j co line observations of protostellar outflows in the orion molecular clouds |
the modern search for extraterrestrial intelligence began with the seminal publications of cocconi & morrison and schwartz & townes, who proposed searching for narrowband signals in the radio spectrum and optical laser pulses. over the last six decades, more than 100 dedicated search programs have targeted thes... | searching for interstellar quantum communications |
a plausible formation scenario for the galactic globular clusters 47 tucanae (47 tuc) and omega centauri $(ω$ cen) is that they are tidally stripped remnants of dwarf galaxies, in which case they are likely to have retained a fraction of their dark matter cores. in this study, we have used the ultra-wide band receiver ... | a search for annihilating dark matter in 47 tucanae and omega centauri |
fermi j1544-0649 is a transient gev source first detected during its gev flares in 2017. multiwavelength observations during the flaring time demonstrate variability and spectral energy distributions that are typical of a blazar. other than the flare time, fermi j1544-0649 is quiet in the gev band and has looked rather... | is fermi 1544-0649 a misaligned blazar? discovering the jet structure with very long baseline interferometry |
the high-frequency (hf) ionospheric cutoff restricts the possibilities of radio astronomical observations from the earth, but on the other hand, it allows one to estimate the f2-layer critical frequency of the ionosphere. this effect has been measured using a new active antenna meant for receiving cosmic radio emission... | validation of f2-layer critical frequency variations in the ionosphere with radio observations of solar bursts |
we present our fifth set of results from our mid-infrared imaging survey of milky way giant h ii (gh ii) regions with our detailed analysis of dr7 and k3-50. we obtained 20/25 and 37 μm imaging maps of both regions using the forcast instrument on the stratospheric observatory for infrared astronomy. we investigate the ... | surveying the giant h ii regions of the milky way with sofia: v. dr7 and k3-50 |
we focus on characterizing the high-energy emission mechanisms of blazars by analyzing the variability in the radio band of the light curves of more than a thousand sources. we are interested in assigning complexity parameters to these sources, modeling the time series of the light curves with the method of the horizon... | assigning degrees of stochasticity to blazar light curves in the radio band using complex networks |
we present new h i observations of the nearby massive spiral galaxy m 83 taken with the jvla at 21″ angular resolution (≈500 pc) of an extended (∼1.5 deg2) ten-point mosaic combined with gbt single-dish data. we study the super-extended h i disk of m 83 (∼50 kpc in radius), in particular disk kinematics, rotation, and ... | kinematic analysis of the super-extended h i disk of the nearby spiral galaxy m 83 |
stratospheric observatory for infrared astronomy/high-resolution airborne wideband camera-plus 154 μm far-infrared polarimetry observations of the well-studied edge-on galaxy ngc 891 are analyzed and compared to simple disk models with ordered (planar) and turbulent magnetic fields. the overall low magnitude and the na... | exploring the magnetic field geometry in ngc 891 with sofia/hawc+ |
the outer galaxy beyond the outer arm represents a promising opportunity to study star formation in an environment vastly different from the solar neighborhood. in our previous study, we identified 788 candidate star-forming regions in the outer galaxy (at galactocentric radii r g ≥ 13.5 kpc) based on the wide-field in... | star formation activity beyond the outer arm. ii. distribution and properties of star formation |
the five-hundred-meter aperture spherical radio telescope (fast) completed its commissioning and began the commensal radio astronomy fast survey (crafts), a multi-year survey to cover 60% of the sky, in 2020. we present predictions for the number of radio-flaring ultracool dwarfs (ucds) that are likely to be detected b... | the potential of detecting radio-flaring ultracool dwarfs at l band in the fast drift-scan survey |
the extraordinary 2021 september-october outburst of centaur 29p/schwassmann-wachmann 1 afforded an opportunity to test the composition of primitive kuiper disk material at high sensitivity. we conducted nearly simultaneous multiwavelength spectroscopic observations of 29p/schwassmann-wachmann 1 using ishell at the nas... | molecular outgassing in centaur 29p/schwassmann-wachmann 1 during its exceptional 2021 outburst: coordinated multiwavelength observations using nflash at apex and ishell at the nasa-irtf |
several ongoing or planned synoptic optical surveys are offering, or will soon be offering, an unprecedented opportunity for discovering larger samples of the rarest types of stripped-envelope core-collapse supernovae, such as those associated with relativistic jets, mildly relativistic ejecta, or strong interaction wi... | an optimized radio follow-up strategy for stripped-envelope core-collapse supernovae |
this book is a concise primer on galactic radio astronomy for undergraduate and graduate students, and provides wide coverage of galactic astronomy and astrophysics such as the physics of interstellar matter and the dynamics and structure of the milky way galaxy and galaxies. radio astronomy and its technological devel... | galactic radio astronomy |
as the next generation of radio astronomical telescopes continue to improve and develop, the pulsar survey will produce millions of pulsar candidates, which pose considerable challenges for pulsar identification and classification. the rapidly evolving artificial intelligence (ai) techniques are being used for pulsar i... | research on pulsar candidate identification method based on deep residual neural network |
i present an exact and explicit solution to the scalar (stokes flux intensity) radio interferometer imaging equation on a spherical surface which is valid also for non-coplanar interferometer configurations. this imaging equation is comparable to w-term imaging algorithms, but by using a spherical rather than a cartesi... | imaging on a sphere with interferometers: the spherical wave harmonic transform. |
turbulence and magnetic fields are ubiquitous in the universe. their importance to astronomy cannot be overestimated. the theoretical advancements in magnetohydrodynamic (mhd) turbulence achieved during the past two decades have significantly influenced many fields of astronomy. this book provides predictive theories o... | study on magnetohydrodynamic turbulence and its astrophysical applications |
our study of a steady decline of solar high-latitude (?45?) photospheric magnetic fields for the past 20 years combined with the fact that cycle 24 is already past its peak, implies that high-latitude fields are likely to decline until ∼2020, the expected minimum of cycle 24.also, interplanetary scintillation (ips) obs... | solar and interplanetary signatures of a maunder-like grand solar minimum around the corner - implications to near-earth space |
gaseous inflows are necessary suppliers of galaxies' star-forming fuel, but are difficult to characterize at the survey scale. we use integral-field spectroscopic measurements of gas-phase metallicity and single-dish radio measurements of total atomic gas mass to estimate the magnitude and frequency of gaseous inflows ... | sdss-iv/manga: can impulsive gaseous inflows explain steep oxygen abundance profiles and anomalously low-metallicity regions? |
a novel search technique for ultralight dark matter has been developed and carried out over a narrow range in the l band, utilizing the recent breakthrough listen public data release of three years of observation with the green bank telescope. the search concept depends only on the assumption of decay or annihilation o... | a model-independent radio telescope dark matter search |
we report on 167 infrared (ir) galaxies selected by akari and iras and detected in the atacama cosmology telescope (act) data release 5 (dr5) sky maps at the 98, 150, and 220 ghz frequency bands. of these detections, 134 (80%) of the millimeter counterparts are first-time identifications with act. we expand the previou... | infrared galaxies detected by the atacama cosmology telescope |
the study of time-variable astronomical phenomena is undergoing an explosive renaissance ushered in by recent advancements in capabilities to monitor the sky from radio to gamma rays. the infrared region of the electromagnetic spectrum provides a unique window to uncover a vast array of stellar eruptions and explosions... | hunting for hidden explosions: exploring the transient infrared sky with the spitzer space telescope |
we estimate spatial gradients in the ionosphere using the global positioning system and glonass (russian global navigation system) observations, utilising data from multiple global positioning system stations in the vicinity of murchison radio-astronomy observatory. in previous work, the ionosphere was characterised us... | ionospheric modelling using gps to calibrate the mwa. ii: regional ionospheric modelling using gps and glonass to estimate ionospheric gradients |
massive stars have very strong stellar winds which interact with their environment. this work has involved the study of these interactive winds at radio and other wavelengths. radio observations have been made of the massive runaway star bd+43 3654 and its bow shock which is interacting with the inter-stellar medium. t... | interferometric radio observations of the interactive winds of massive stars |
modern wireless systems have tremendous applications in communication, medicine, defense, aerospace, remote sensing, tracking, astronomy, fashion, etc. these systems make heavy use of microwave components made of a substantial amount of non-degradable materials as dielectrics or insulators. these non-degradable materia... | bio-based materials for microwave devices: a review |
hess j1943+213 is an unidentified tev source that is likely a high-frequency-peaked bl lac (hbl) object, but that is also compatible with a pulsar wind nebula (pwn) nature. each of these enormously different astronomical interpretations is supported by some of the observed unusual characteristics. in order to finally c... | hess j1943+213: a non-classical high-frequency-peaked bl lac object |
the surface accuracy of a large parabolic antenna is an important indicator to evaluate the quality of the antenna. it not only directly affects the antenna's aperture efficiency, thereby determining the shortest wavelength that the antenna can work, but also affects the main lobe width and side lobe structure of the a... | research on the panel adjustment method of an active main reflector for a large radio telescope |
although meteoroid fragmentation has been observed and studied in the optical meteor community since the 1950s, no definitive fragmentation mechanisms for the relatively small meteoroids (mass ≲10-4 kg) have been proposed. this is in part due to the lack of observations to constrain physical models of the fragmentation... | high-resolution radar observations of meteoroid fragmentation and flaring at the jicamarca radio observatory |
when a lightning flash is propagating in the atmosphere it is known that especially the negative leaders emit a large number of very high frequency (vhf) radio pulses. it is thought that this is due to streamer activity at the tip of the growing negative leader. in this work, we have investigated the dependence of the ... | the relationship of lightning radio pulse amplitudes and source altitudes as observed by lofar |
this book, both a monograph and a graduate textbook, is based on my original research and partly on the materials prepared earlier for the 2007 and 2008 iars astrophysics summer school in istanbul, astromundus course 'supernovae and their remnants' that was held for the first time in 2011 at the department of astronomy... | evolution of supernova remnants |
during the 1950s and 1960s australia was a world leader in the specialised field of low frequency radio astronomy, with two geographically-distinct areas of activity. one was in the sydney region and the other in the island of tasmania to the south of the australian mainland. research in the sydney region began in 1949... | the history of early low frequency radio astronomy in australia. 1: the csiro division of radiophysics |
this paper addressed the dark matter analysis on the spiral galaxy ngc 4321 (m100) by considering the nine different dark matter profiles, so far lacking in the scientific literature, i.e., pseudoisothermal, burkert, nfw, moore, einasto, core-modified, dc14, corenfw and lucky13 profiles. in this paper, we analyzed the ... | a comprehensive analysis using 9 dark matter halo models on the spiral galaxy ngc 4321 |
we present omniuv, a multipurpose simulation toolkit for space and ground vlbi observations. it supports various kinds of vlbi stations, including earth (ground) fixed, earth orbit, lunar fixed, lunar orbit, moon-earth, and earth-sun lagrange 1 and 2 points, etc. the main functionalities of this toolkit are: (1) trajec... | omniuv: a multipurpose simulation toolkit for vlbi observation |
the new generation radio telescopes, such as the square kilometre array (ska) currently under construction, will use aperture array, technology for the low frequency regime. for ska2, the second phase scheduled after the realization of ska1, aperture array technology is proposed up to 1.4 ghz. the antenna element count... | expanding the field of view: station design for the aamid ska radio telescope |
context. the odin satellite is now into its twentieth year of operation, much surpassing its design life of two years. one of its major astronomical pursuits was the search for and study of water vapor in diverse regions of the solar system and the milky way galaxy. the herschel space observatory was needed to detect w... | herschel and odin observations of h2o, co, ch, ch+, and [n ii] in the barred spiral galaxy ngc 1365. bar-induced activity in the outer and inner circumnuclear tori |
there have been a dramatic increase in the number of optical and radio transient surveys due to astronomical transients such as gravitational waves and gamma ray bursts, however, there have been a limited number of wide-field infrared surveys due to narrow field-of-view and high cost of infrared cameras, we present two... | wide-field dynamic astronomy in the near-infrared with palomar gattini-ir and dreams |
context. nitriles constitute almost 15% of the molecules observed in the interstellar medium (ism), surprisingly only two dinitriles have been detected in the ism so far. the lack of astronomical detections for dinitriles may be partly explained by the absence of laboratory rotational spectroscopic data.aims: our goal ... | rotational spectroscopy and astronomical search for glutaronitrile |
the atacama large millimeter/sub-millimeter array (alma) is an interferometric radio observatory in northern chile. the alma data processing pipelines, written in python and built largely upon the common astronomy software applications package (casa), produce calibrated measurement sets, images and supporting products.... | pipeline calibration and imaging for the alma observatory |
the earth's ionosphere is a highly variable medium on a wide range of spatio-temporal scales. the responsiveness of plasma to the geomagnetic field and its changes gives rise to anisotropy, which may introduce wave-like characteristics while scanning the ionosphere with a line-of-sight towards a radio source. previous ... | detection of periodic disturbances in lofar calibration solutions |
we propose a very long baseline interferometry (vlbi) precision evaluation method for probe delay measurement, so as to investigate the error contributions from different components in the chinese vlbi network (cvn). this method takes the idea of traditional closure delay analysis for distant radio sources. it focuses ... | the precision analysis of the chinese vlbi network in probe delay measurement |
solar radio burst is an arrangement of a frequency space that variation with time. most of radio burst can be identified in low frequency range such as below 200 mhz and depending on frequencies. solar radio bursts were the first phenomenon identified in the field of radio astronomy field. solar radio frequency range i... | analysis of type ii and type iii solar radio bursts |
the emerging generation of radio interferometric (ri) telescopes, such as the square kilometre array (ska), will acquire massive volumes of data and transition radio astronomy to a big-data era. the ill-posed inverse problem of imaging the raw visibilities acquired by ri telescopes will become significantly more comput... | online radio interferometric imaging: assimilating and discarding visibilities on arrival |
context. cyanamide is one of the few interstellar molecules containing two chemically different n atoms. it was detected recently toward the solar-type protostar iras 16293-2422 b together with h2n13cn and hdncn in the course of the atacama large millimeter/submillimeter array (alma) protostellar interferometric line s... | laboratory spectroscopic study of the 15n isotopomers of cyanamide, h2ncn, and a search for them toward iras 16293-2422 b |
in this work detailed transition assignments and wavenumbers for interstate transitions from the lowest lying trans-state to higher lying gauche-states (o1 and e1) for doubly deuterated asymmetric methanol (chd2oh) in the high resolution fourier transform far infrared (fir) spectrum are presented. the assignment method... | trans- to gauche-transitions in the far infrared spectrum of methanol-d2 (chd2oh) in the torsional ground state |
surface plasmon polaritons are electromagnetic waves that propagate tightly bound to metal surfaces. the concentration of the electromagnetic field at the surface as well as the short wavelength of surface plasmons enable sensitive detection methods and miniaturization of optics. we present an optical frequency plasmon... | a phased antenna array for surface plasmons |
preface; acknowledgements; figure credits; part i. to 1874: 1. physics in the nineteenth century; 2. mathematics and physics in cambridge in the nineteenth century; part ii. 1874 to 1879: 3. the maxwell era; part iii. 1879 to 1884: 4. rayleigh's quinquennium; part iv. 1884 to 1919: 5. the challenges facing j. j. thomso... | maxwell's enduring legacy |
the baryon acoustic oscillations from integrated neutral gas observations (bingo) telescope is a new 40m class radio telescope to measure the large-angular-scale intensity of hi emission at 980-1260mhz to constrain dark energy parameters. as it needs to measure faint cosmological signals at the millikelvin level, it re... | baryon acoustic oscillations from integrated neutral gas observations: radio frequency interference measurements and telescope site selection |
we explore the general question of correlations among different waveband luminosities in a flux-limited multiband observational data set. such correlations, often observed for astronomical sources, may be either intrinsic or induced by the redshift evolution of the luminosities and the data truncation due to the flux l... | luminosity-luminosity correlations in flux-limited multiwavelength data |
we present the polarization pulse profiles for 29 pulsars observed with the arecibo observatory by the north american nanohertz observatory for gravitational waves (nanograv) timing project at 2.1 ghz, 1.4 ghz, and 430 mhz. these profiles represent the most sensitive polarimetric millisecond pulsar profiles to date, re... | pulsars as calibration tools and x-ray observations of spider pulsars |
while seti is often thought of as a part of radio astronomy with optical seti, artifact seti, meti, and other approaches to finding intelligent life considered to be allied fields, seti is better understood as an interdisciplinary field with many subfields, approaches, and components. in particular, robert bradbury has... | taxonomy and jargon in seti as an interdisciplinary field of study |
we present a multiwavelength study toward the filamentary molecular cloud g341.244-00.265, to investigate the physical and chemical properties, as well as star formation activities taking place therein. our radio continuum and molecular line data were obtained from the sydney university molonglo sky survey (sumss), ata... | a multiwavelength study of filamentary cloud g341.244-00.265 |
the first observations by a worldwide network of advanced interferometric gravitational wave detectors offer a unique opportunity for the astronomical community. at design sensitivity, these facilities will be able to detect coalescing binary neutron stars to distances approaching 400 mpc, and neutron star-black hole s... | hunting gravitational waves with multi-messenger counterparts: australia's role |
we report a discovery of shocked gas from the supernova remnant (snr) g357.7+0.3. our millimeter and submillimeter observations reveal broad molecular lines of co(2-1), co(3-2), co(4-3), 13co (2-1), and 13co (3-2), hco+, and hcn using the heinrich hertz submillimeter telescope, the arizona 12 m telescope, apex, and the... | discovery of broad molecular lines and of shocked molecular hydrogen from the supernova remnant g357.7+0.3: hhsmt, apex, spitzer, and sofia observations |
in preparing the way for the square kilometre array and its pathfinders, there is a pressing need to begin probing the transient sky in a fully robotic fashion using the current generation of radio telescopes. effective exploitation of such surveys requires a largely automated data-reduction process. this paper introdu... | chimenea and other tools: automated imaging of multi-epoch radio-synthesis data with casa |
if fast radio bursts (frbs) are truly at astronomical, in particular cosmological, distances, they represent one of the most exciting discoveries in astrophysics of the past decade. however, the distance to frbs has, to date, been estimated purely from their excess dispersion, and has not been corroborated by any indep... | neutral hydrogen absorption towards fast radio bursts. |
until recently, there have been few studies of the protostellar evolution of intermediate-mass (im) stars, which may bridge the low- and high-mass regimes. this paper aims to investigate whether the properties of an im protostar within the iras 05373+2349 embedded cluster are similar to that of low- and/or high-mass pr... | connecting low- and high-mass star formation: the intermediate-mass protostar iras 05373+2349 vla 2 |
in recent years, deep learning has been successfully applied in various scientific domains. following these promising results and performances, it has recently also started being evaluated in the domain of radio astronomy. in particular, since radio astronomy is entering the big data era, with the advent of the largest... | radio astronomical images object detection and segmentation: a benchmark on deep learning methods |
since the early sixties, our view of radio galaxies and quasars has been drastically shaped by discoveries made thanks to observations of radio sources listed in the third cambridge catalog and its revised version (3cr). however, the largest fraction of data collected to date on 3cr sources was performed with relativel... | powerful radio sources in the southern sky. i. optical identifications |
the pulsar search collaboratory (psc) is a collaboration between the green bank observatory and west virginia university, funded by the national science foundation. the psc program is currently expanding nationwide and engages high school students, teachers, and undergraduate mentors in real-world research by searching... | the pulsar search collaboratory: current status and future prospects |
variations in scaling behavior in the flux and emissions of distant astronomical sources with respect to their cosmic time are important phenomena that can provide valuable information about the dynamics within the sources and their cosmological evolution with time. different studies have been applying linear analysis ... | cosmological evolution of quasar radio emission in the view of multifractality |
we present robbie: a general work-flow for the detection and characterization of radio variability and transient events in the image domain. robbie is designed to work in a batch processing paradigm with a modular design so that components can be swapped out or upgraded to adapt to different input data, whilst retainin... | robbie: a batch processing work-flow for the detection of radio transients and variables |
radio frequency interference (rfi) excision in wideband radio telescope receivers is gaining significance due to increasing levels of manmade rfi and operation outside the protected radio astronomy bands. the effect of rfi on astronomical data can be significantly reduced through real-time excision. in this paper, medi... | real-time implementation of mad-based rfi excision on fpga |
in this work, we calculated the sizes of unresolved x-ray emission regions in three gravitationally lensed radio-loud quasars, b 1422+231, mg j0414+0534, and q 0957+561, using a combination of imaging and spectral analysis on the x-ray data taken from the chandra x-ray observatory. we tentatively detected fekα emission... | x-ray monitoring of gravitationally lensed radio-loud quasars with chandra |
sensitive photon detection in the gigahertz band constitutes the cornerstone to study different phenomena in astronomy, such as radio burst sources, galaxy formation, cosmic microwave background, axions, comets, gigahertz-peaked spectrum radio sources and supermassive black holes. nowadays, state of the art detectors f... | hypersensitive tunable josephson escape sensor for gigahertz astronomy |
we present results of the investigation of the giant radio pulses (grps) generation rate from 5 radio pulsars (b0301+19, b0950+08, b1112+50, b1133+16, and b1237+25) and anomalous intensity pulses generation rate from b0809+74. all data used were obtained with large phased array radio telescope of pushchino radio astron... | low-frequency observations of giant pulses from ordinary pulsars |
recent spectroscopic observations by sensitive radio telescopes require accurate molecular spectral line frequencies to identify molecular species in a forest of lines detected. to measure rest frequencies of molecular spectral lines in the laboratory, an emission-type millimeter and submillimeter-wave spectrometer uti... | spectrometer using superconductor mixer receiver (sumire) for laboratory submillimeter spectroscopy |
we report the detection of co emission in the recently discovered multiphase isolated gas cloud in the nearby galaxy cluster abell 1367. the cloud is located about 800 kpc in projection from the center of the cluster and at a projected distance of > 80 kpc from any galaxy. it is the first and the only known isolated... | non-star-forming molecular gas in the abell 1367 intra-cluster multiphase orphan cloud |
the square kilometre array (ska) will be the largest radio astronomy observatory ever built, providing unprecedented sensitivity over a very broad frequency band from 50 mhz to 15.3 ghz. the ska's low frequency component (ska-low), which will observe in the 50-350 mhz band, will be built at the murchison radio-astronom... | what is the ska-low sensitivity for your favourite radio source? |
in their searches for astrophysical point sources of high energy neutrinos, both the super-kamiokande and macro neutrino detectors saw the largest angular excess from the same source, viz. psr b1509-58. we estimate the probability for the observed number of events by both super-kamiokande and macro to be a chance coinc... | combined significance of spatial coincidence of high energy neutrinos from psr b1509-58 by super-kamiokande and macro |
the radio jets of an active galactic nucleus (agn) can heat up the gas around a host galaxy and quench star formation activity. the presence of a radio jet could be related to the evolutionary path of the host galaxy and may be imprinted in the morphology and kinematics of the galaxy. in this work, we use data from the... | manga integral-field stellar kinematics of lotss radio galaxies: luminous radio galaxies tend to be slow rotators |
active galactic nuclei (agns) can often be identified in radio images as two lobes, sometimes connected to a core by a radio jet. this multicomponent morphology unfortunately creates difficulties for source finders, leading to components that are (a) separate parts of a wider whole, and (b) offset from the multiwavelen... | a quick look at the 3 ghz radio sky. ii. hunting for dragns in the vla sky survey |
the common astronomy software applications (casa), is the primary data processing software for the atacama large millimeter/submillimeter array (alma) and the karl g. jansky very large array (vla), and is often used also for other radio telescopes. casa has always been distributed as a single, integrated application, i... | casa 6: modular integration in python |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.