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the results of photometric observations of two bright blazars of the northern hemisphere, namely, bl lacertae and 1es 1426+428, during 2018-2020 through bvri filters of the johnson/bessel system are given. the observations were performed with the two telescopes: azt-8 of observation station lisnyky of the astronomical ... | photometric variability of bl lacertae and 1es 1426+428 blazars in the optical and gamma ranges |
the cherenkov telescope array (cta) — an array of many tens of imaging atmospheric cherenkov telescopes deployed on an unprecedented scale — is the next generation instrument in the field of very high energy gamma-ray astronomy. cta will operate as an open observatory providing data products to the scientific community... | prototype of a production system for cherenkov telescope array with dirac |
pyirf is a prototype for the generation of instrument response functions (irfs) for the cherenkov telescope array (cta). the package is being developed and tested by members of the cta consortium. documentation: https://cta-observatory.github.io/pyirf/ source code: https://github.com/cta-observatory/pyirf | pyirf |
the cherenkov telescope array (cta) is a project to build a new generation ground-based gamma-ray observatory. among other goals, the project aims to achieve high precision of gamma-ray energy measurement while maximizing the use of observation time. these objectives require detailed and fast information about atmosphe... | fram for cta |
cta will have important synergies with many of the new generation of astronomical and astroparticle observatories. as the flagship vhe gamma-ray observatory for the coming decades, cta plays a similar role in the vhe waveband as the ska in radio, alma at millimetre, or e-elt/tmt/gmt in the optical wavebands, providing ... | synergies |
in response to the ligo-virgo gw event s190923y at t0 = 2019-09-23 12:55:59.646 utc a preliminary analysis of the agile exposure at t0 shows that the gamma-ray imaging detector (grid) exposure covered the 10% of the 90% c.l. localization region (lr) (40% of 90% c.l. localization region (lr) is occulted by earth) at an ... | ligo/virgo s190923y: upper limits from agile-grid observations |
preliminary results of the investigation of the properties of 7 galaxy cluster from cfa2 redshift survey are discussed in the presented article. clusters 933, 142, 1046, and 1652 have several peculiarities of the spatial distributions of galaxies. the distributions on absolute magnitude and luminosity represent two are... | the results of analysis of rich galaxy clusters from cfa2 redshift survey spatial distribution |
cherenkov telescope array (cta) is the next generation ground-based observatory for gamma-ray astronomy at very-high energies which will consist of the northern (cta-n, la palma, spain) and southern (cta-s, paranal, chile) arrays. the atmosphere, as an integral part of the cherenkov telescope detector, has a great impa... | the influence of reduced atmospheric transmission on the cta-north performance |
the gamma-ray energy range from a few hundred kev to a few hundred mev has remained largely unexplored, mainly due to the challenging nature of the measurements, since the pioneering, but limited, observations by comptel on the compton gamma-ray observatory (1991-2000). this energy range is a transition region between ... | extending fermi lat discoveries: compton-pair production space telescope (compair) for mev gamma-ray astronomy |
pushing the limits of current remote sensing (rs) instrumental sensitivity and resolution, state-of-the-art image processing techniques applied to coronal imaging data from extreme ultraviolet (euv) and white-light (wl) coronagraph instruments can overcome faint signals and noise in data. in the past few years, we have... | visualization tools for remote sensing data |
the fram (f/(ph)otometric robotic atmospheric monitor) telescope is a part of the pierre auger observatory (pao) located near town malargüe in argentina. the main task of the fram telescope is the continuous night - time monitoring of the atmospheric extinction and its wavelength dependence. the current methodology of ... | fram telescope - monitoring of atmospheric extinction and variable star photometry |
gamma-ray astronomy in the mev energy range shows a lack of sensitivity compared to other gamma-ray energy bands. several space observatory projects are proposed to space agencies to fill this gap. the comcube cubesat project will focus on the measurement of the polarization of the prompt emission of gamma-ray bursts (... | development of a compton telescope calorimeter module for mev-range gamma-ray astronomy |
the begira project consists in making available the 1.23 m calar alto (caha) telescope to students of the university of the basque country (upv/ehu). the project is designed in such a way that undergraduate and graduate students of the máster oficial en ciencia y tecnología espacial of the upv/ehu can control remotely ... | begira: basque educational gate for interactive and remote astronomy |
the solar eclipse of 2017 august 21 provides an excellent opportunity to examine very low frequency (vlf) radio signal propagation through the path of the solar eclipse between navy vlf transmitters and several vlf receivers. the vlf transmitters available for this study radio signal propagation study are nlk in jim cr... | comparisons of measurements and modeling of solar eclipse effects on vlf transmissions |
we report on the search results of fast radio bursts (frbs) from three gamma-ray bursts (grbs) at 2256 mhz using the 40-m radio telescope located at the yunnan astronomical observatory (ynao). the search for signals was triggered by the burst alert telescope (bat) onboard the swift satellite. radio single pulses are se... | a search for fast radio bursts associated with gamma-ray bursts using the ynao 40-m radio telescope |
preliminary results of the investigation of the properties of 13 clusters of galaxies from cfa2 redshift survey are discussed in the presented article. the distributions on absolute magnitude and luminosity represent two areas for clusters ##88, 1101, 1046, 142, 933, 1242, 1652, 107, 150, 316, 317, 961, 977. redshifts ... | preliminary results of rich galaxy clusters' spatial distribution analysis on cfa2 redshift survey data: compact objects or dark matter presence at redshift less 0.032 |
the 1.0 metre f/4 fast-slew zadko telescope was installed in june 2008 approximately seventy kilometres north of perth at yeal, in the shire of gingin, western australia. since the zadko telescope has been in operation it has proven its worth by detecting numerous gamma ray burst afterglows, two of these being the most... | the zadko observatory |
little is known still about the origin of the high-energy and sustained emission from long duration gamma-ray flares (ldgrfs), identified with compton gamma-ray observatory (cgro), the solar maximum mission (smm), and now fermi. though fermi/lat has identified dozens of flares with ldgrf emission, the nature of this em... | long duration gamma-ray flares & solar energetic particles — is there a connection? |
with approval imminent, construction will soon begin on cherenkov telescope array | observatory to probe origins of ferocious gamma rays |
the cherenkov telescope array (cta) will be the next generation ground-based observatory for gamma-ray astronomy at very-high energies. it will consist of over a hundred telescopes of different sizes (small, medium, and large) located in the northern and southern hemispheres. the italian national institute of astrophys... | the astri contribution to the cherenkov telescope array: mirror production for the sst-2m astri and the mst telescopes |
on 2011 november 1, we discovered ptf11qcj in an r-band image from the 48 inch samuel oschin telescope at palomar observatory (p48), which is routinely used by the palomar transient factory (ptf). subsequent observations with the p48 were conducted with the mould-r and gunn-g filters. photometry (table2) was performed ... | vizier online data catalog: panchromatic observations of ptf11qcj (corsi+, 2014) |
master-oafa robotic telescope (global master-net: http://observ.pereplet.ru, lipunov et al., 2010, advances in astronomy, vol. 2010, 30l) located in argentina (oafa observatory of san juan national university) started inspect of the fermi grb210714.33 (trigger no 647942198 https://gcn.gsfc.nasa.gov/other/647942198.ferm... | master ot j205357.98-530820.3 - bright optical counterpart of grb 210714a / fermi tr.647942198 |
the gamma-ray cherenkov telescope prototype (pgct) is a prototype of an imaging atmospheric cherenkov telescope, developed as small-sized telescope (sst) of 4m during the preparation of the cherenkov telescope array (cta). based on a schwarzschild-couder dual-mirror optical design aiming to provide an optimised point s... | update on the characterisation of the pgct, a prototype of 4m dual-mirror cherenkov telescope |
follow-up observations of the optical fast transient ztf23aabmzlp/at2023azs (andreoni et al., gcn #33229, astronote 2023-21) were carried out with the neil gehrels swift observatory starting on 2023-01-29 09:54 ut. the total exposure time on target was 1.9ks. a faint source is tentatively detected in swift xrt data at ... | ztf23aabmzlp/at2023azs: neil gehrels swift observatory x-ray observations |
the smallsat seej (structure & evolution of exojupiter atmospheres; pronounced "siege") will measure both the fluxes of high-energy photons emanating from nearby, planet-hosting stars and the absorption depth of x-rays in the atmospheres of hot jupiter, saturn, and neptune analogs. specifically, the seej investigat... | a smallsat to study the structure and evolution of exojupiter atmospheres (seej) |
over the course of approximately ten years, we have adopted, modified and developed two categories of activities for an introductory level astronomy course geared toward non-science majors. one category involves a semester-long project that features simple observations, while the other utilizes shorter hands-on activit... | modifying introductory activities for pandemic modes |
ctools is a software package developed for the scientific analysis of cherenkov telescope array (cta) data, as well as data from existing imaging air cherenkov telescopes (such as h.e.s.s., magic or veritas). ctools comprises a set of ftools-like binary executables and python scripts with a command-line interface allow... | ctools 1.7.4 |
the cold shaping (or cold slumping) replication of thin glass foils is an attractive solution for making future high throughput x-ray telescopes. a similar approach is being successfully used for making the normal-incidence mirrors of cherenkov telescopes like magic i and ii and cta. the process starts with a thin flat... | development of thin glass mirrors via cold shaping replication for future x-ray telescopes |
x-ray optics are an essential component of nearly all future x-ray astronomy missions. their mass and cost are the most important factors influencing the feasibility of a mission. the high angular resolution telescope mirrors of the chandra observatory were full shells of revolution made of polished zerodur that were m... | merging technologies to develop light weight, high throughput full-shell x-ray optics |
dr. gregory sivakoff (university of alberta) and colleagues have requested aavso assistance begining immediately in monitoring the x-ray binary aquila x-1 (v1333 aql) during its current outburst. dr. sivakoff writes: "aquila x-1 (v1333 aql) is the prototypical recurrent neutron star low-mass x-ray binary. it undergoes ... | monitoring requested for aquila x-1 (v1333 aql) outburst |
this thesis provides a comprehensive examination of star formation in the host galaxies of active galactic nuclei or agn. agn are bright, central regions of galaxies that are powered through accretion onto a supermassive black hole (smbh). through accretion and the loss of gravitational potential energy, agn emit power... | the star-forming properties of an ultra-hard x-ray selected sample of active galactic nuclei |
we observed the field of the swift/bat grb 210402a (page et al., gcn circ. 29743) with the ddoti wide-field imager at the observatorio astronómico nacional on sierra san pedro martir (http://ddoti.astroscu.unam.mx) from 2021-04-03 02:52 utc to 2021-04-03 12:18 utc (from 4.8 to 14.2 hours after the trigger). we observed... | grb 210402a: ddoti upper limits |
we use a large sample of laes selected over a redshift range of z~2-6 in the cosmos field (sc4k; sobral et al. 2018mnras.476.4725s, cat. j/mnras/476/4725). sc4k also includes the calymha cosmos sample at z=2.2 (sobral et al. 2017mnras.466.1242s, cat. j/mnras/466/1242), with hα coverage from hizels (geach et al. 2008mnr... | vizier online data catalog: x-ray and radio activity of ly α emitters (calhau+, 2020) |
the cherenkov telescope array (cta) is planned to be an observatory for very high energy -ray astronomy and will consist of several tens of telescopes which account for a reflective surface of more than 10000 m. these mirrors will be formed by a set of reflective facets. different technological solutions, for a fast an... | argentinean outdoor test facility for mirrors |
the spanish astronomer xavier barcons, who has been appointed as the next director-general of the european southern observatory (eso), is an eso veteran with a background in x-ray astronomy. | careers and people |
solar jets of all sizes are magnetically channeled narrow eruptive events; the larger ones are often observed in the solar corona in euv and coronal x-ray images. recent observations show that the buildup and triggering of the minifilament eruptions that drive coronal jets result from magnetic flux cancelation under th... | hi-c2.1 observations of solar jetlets at sites of flux cancelation |
in this current golden age of x-ray astronomy, the frontiers of the x-ray universe are continually expanding in multiple, often unexpected, directions, due to the extraordinary success and longevity of both esa's xmm-newton and nasa's chandra x-ray observatory. these two ground-breaking, major observatories are support... | 10+ more years of chandra-xmm-newton synergy |
in 2012, a geographic dark sky survey of the malvern hills area of outstanding natural beauty (mhaonb) was carried out, commissioned by malvern hills conservators. the sky brightness has been measured continually ever since then at the authors mathon based rural observatory, in the last few years at 2-minute intervals ... | astronomical all sky background light pollution database and modelling analysis at mhaonb uk, from distant conversions to leds and climate change |
the recently released astro2020 decadal survey highlighted the importance of time domain astronomy, and specifically highlighted the successes of nasa's neil gehrels swift observatory. swift is currently at the forefront of tda, with its rapid slewing, sensitive multi-wavelength instrumentation, flexible automated too ... | swift and the future of time domain astronomy |
infrared dark clouds (irdcs) are cold, dense, massive galactic star-forming regions that allow us to understand the physical conditions during the early stages of high-mass star formation (o and early b-types, >20 msun). we present a sample of ~3,000 candidate young stellar objects (ysos) in three irdcs, g34.43+00.2... | x-raying the bones of the milky way:two modes of vigorous star formation in galactic infrared dark clouds |
sherpa is a fitting tool originally developed as part of the chandra x-ray observatory data analysis software, ciao: its first version was distributed in october 1999. seventeen years later, sherpa is a python package with c, c++, and fortran extensions, openly developed on github. although x-ray scientific drivers rem... | sherpa, python, and astronomy. a successful co-evolution. |
the cherenkov telescope array (cta) will be the future observatory for ground-based tev gamma-ray astronomy. at two sites, one in the northern and one in the southern hemisphere, cta will feature about one hundred telescopes of different size classes in order to significantly improve the sensitivity and energy range wi... | readout electronics testing during mass production of flashcam cameras for the cherenkov telescope array |
chandra x-ray observatory revolutionized the x-ray astronomy as being the first, and so far the only, x-ray telescope achieving sub-arcsecond spacial resolution. chandra is comprised of three principal elements: the high resolution mirror assembly (hrma), pointing control and aspect determination (pcad) system, and the... | the quality and stability of chandra telescope spacial resolution |
we describe a process for cross-calibrating the effective areas of x-ray telescopes that observe common targets. the targets are not assumed to be "standard candles" in the classic sense, in that the only constraint placed on the source flux is that it is the same for all instruments. we apply a technique developed by ... | concordance: in-flight calibration of x-ray telescopes without absolute references |
our friend and colleague, daniel e. harris, died on december 6th 2015. dan was a passionate astronomer and world traveller. he led a rich and scientifically productive life until the end. dan was the first person to receive a phd in radio astronomy at caltech where he was a student of john bolton, one of the fathers of... | obituary: daniel e. harris (1934 - 2015) |
the cherenkov telescope array is the next-generation observatory for ground-based gamma-ray astronomy. with more than 100 telescopes equipped with state-of the-art technologies, it will provide a new view of the sky at energies between a few gev and up to 300 tev at unprecedented sensitivity and angular resolution. to ... | the cherenkov telescope array - overview of the simulation and analysis |
at 2018-06-21 ut, we continued our observation of the transient, at2018cow/atlas18qqn (smartt et al. atel #11727) using various telescopes including the snu astronomical observatory (sao) 1m telescope, the loao 1m telescope, the mcdonald 0.8 m telescope, and the lee sang gak telescope (lsgt) at sso. bvri images and opt... | continued optical follow-up of at2018cow/atlas18qqn using sao 1m telescope |
astronomy is entering an unprecedented era with next generation observatories like erosita, lsst, ska, and cta. the growing volume of astronomical data demand analysis of large amounts of multiwavelength data and the timely classification of numerous sources. machine learning algorithms provide an efficient way of iden... | classifying x-ray sources using machine learning |
gamma-ray astronomy is the study of very energetic photons, from e = mec2 ≈0.5x10 6 ev to > ≥1020ev. due to the large span of the energy range, the field focuses on non-thermal processes that include the acceleration and propagation of relativistic particles, which can be found in extreme environments such as pulsar... | search for high-energy gamma rays in the northern fermi bubble region with the hawc observatory |
the athena x-ray telescope comprises an optical system with several hundreds of silicon pore optics (spo) mirror modules (mm) to be assembled. all the mms have to be tested for acceptance before integration. inaf-osservatorio astronomico brera is building in its premises of merate (italy) a unique pathfinder facility, ... | beatrix: the beam expander testing x-ray facility for testing athena's spo modules: progress in the realization |
the nasa's universe of learning (nasa's uol) project creates and delivers science-driven, audience-driven resources and experiences designed to engage and immerse learners of all ages and backgrounds in exploring the universe for themselves. the competitively-selected project represents a unique partnership between the... | authentic research with nasa's universe of learning global telescope network |
in table 1 we present the already reduced differential optical photometry of the gamma-ray binary ls i +61 303 obtained with the robotic telescope fabra-roa montsec (tfrm; 0.5m aperture, 0.78m primary mirror) at the observatori astronomic del montsec (lleida, spain; see fors et al. 2013pasp..125..522f). the observation... | vizier online data catalog: optical observations of ls i +61 303 (paredes-fortuny+, 2015) |
3d printing scientific data has the capability to help address equity of accessibility to knowledge sharing in scientific information through the creation of three-dimensional (3d) printed data sets, particularly with direct input into the efficacy of 3d printed models from blind or visually impaired (bvi) communities ... | stellar 3d printing: tactile and braille communications in space science |
the cherenkov telescope array (cta) is a worldwide project aimed at building the next-generation ground-based gamma-ray observatory. within the cta project, the italian national institute for astrophysics (inaf) is developing an end-to-end prototype of the cta small-size telescopes with a dual-mirror (sst-2m) schwarzsc... | astri sst-2m prototype and mini-array simulation chain, data reduction software, and archive in the framework of the cherenkov telescope array |
transients can be defined as astrophysical phenomena whose duration is significantly lower than the typical timescale of the stellar and galactic evolution (from seconds to years in contrast to millions or billions of years). supernovae, novae, gamma-ray burst,..., are some examples of transient events. in most cases, ... | transient characterization using the virtual observatory |
coronal jets are narrow eruptions in the solar corona, and are often observed in extreme ultraviolet (euv) and x-ray images. they occur everywhere on the solar disk: in active regions, quiet regions, and coronal holes (raouafi et al. 2016). recent studies indicate that most coronal jets in quiet regions and coronal hol... | magnetic flux cancellation as the trigger of solar coronal jets |
we observed the localization region of the grb 230812b (trigger 713559497, gcn 34386) detected by the gamma-ray burst monitor (gbm) on the fermi satellite with the 47 square-degree zwicky transient facility (ztf) camera (graham et al., 2019; bellm et al., 2019). we obtained images in the g-, and r- covering 420 square ... | grb 230812b: zwicky transient facility identifies optical afterglow candidate of a fermi grb (trigger 713559497) |
*pyirf* is a python3-based library for the generation of instrument response functions (irfs) and sensitivities for the cherenkov telescope array (cta) | cta-observatory/pyirf: v0.8.1 – 2023-03-16 |
the beatrix (beam expander testing x-ray) facility, now operational at inaf-brera astronomical observatory, will represent a cornerstone in the acceptance roadmap of silicon pore optics (spo) mirror modules, and will so contribute to the final angular resolution of the athena x-ray telescope. by expansion and collimati... | optical design and performance simulations for the 1.49 kev beamline of the beatrix x-ray facility |
the standardisation of gamma-ray astronomical data emerged in recent years as a necessity for the future generation of gamma-ray observatories. nevertheless, adopting a common format for gamma-ray instruments can already benefit the current generation of gamma-ray instruments. as the end of their operations approaches,... | establishing the magic data legacy: adopting standardised data formats and open-source analysis tools |
the cherenkov telescope array (cta) promises to open a new frontierin very high energy gamma-ray astrophysics, with unprecedentedsensitivity and angular resolution. its broad science goals includethe investigation of sites and mechanisms for particle acceleration,physical processes in the extreme environments of neutro... | x-ray astronomy in the context of cta |
the united states air force academy (usafa) suite of telescopes consists of fourteen total telescopes: the falcon telescope network (ftn), and the usafa one-meter telescope. the limiting magnitude of these telescope systems determines their capability to support specific astronomical and space domain awareness (sda) re... | falcon telescope network and usafa 1-meter telescope systems limiting magnitude research |
ground-based gamma-ray astronomy is a young branch of high-energy astrophysics, addressing the highest energies in the electromagnetic spectrum. tev photons cannot be produced by "ordinary" stars since they require quite extreme conditions, thus they allow the study of extreme astrophysical objects such as supernova re... | the future of ground-based gamma-ray astronomy |
we observed grb 211024a detected by fermi gbm (gcn 30962), localisation further refined by swift/bat-guano a. tohuvavohu et al., (gcn #31006), with 0.7m growth-india telescope (git). we obtained 2 exposures of 300 sec each in the r' filter, separated by ~15 min. we detected a potential candidate in our subtracted image... | grb 211024a: possible afterglow candidate from git |
introductiontaurus hill observatory (tho) [1], observatory code a95, is an amateur observatory located in varkaus, finland. the observatory is maintained by the local astronomical association warkauden kassiopeia. tho research team has observed and measured various stellar objects and phenomena. observatory has mainly ... | taurus hill observatory season 2021 - 2022 exoplanet observations review |
with an increasing number of observatories making their data publicly available, we have truly reached the era of multi-wavelength astronomy. combining gamma-ray data from multiple instruments as well as with measurements at other wavelengths is needed to unlock the data's full potential. however, lack of standardizati... | multi-wavelength data analysis with the threeml framework |
an initial concept study for the x-ray surveyor mission was carried-out by the advanced concept office at marshall space flight center (msfc), with a strawman payload and related requirements that were provided by an informal mission concept team, comprised of msfc and smithsonian astrophysics observatory (sao) scienti... | x-ray surveyor mission concept |
the monitor of all-sky x-ray image (maxi) is an astronomical x-ray observatory mounted on the iss. in this analysis, we used data from the gas slit camera only, which is sensitive in the 2-30kev band. we carried out follow-up observations of a gt mus flare (fn 11) with the neutron star interior composition explorer (ni... | vizier online data catalog: x-ray flare lcs of the rs cvn-type star gt mus (sasaki+, 2021) |
the smithsonian astrophysical observatory (sao) in collaboration with sri/sarnoff has been engaged in a multi year effort to advance the technology of monolithic back-thinned cmos detectors for use as x-ray imaging spectrometers. the long term goal of this campaign is to produce x-ray active pixel sensor (aps) detector... | advancing the technology of monolithic cmos detectors for use as x-ray imaging spectrometers |
following the detection of grb 230405b by swift/bat along with its x-ray counterpart (page et al., gcn 33571), the 0.6 m wide-field meerlicht optical telescope located at sutherland, south africa, obtained a repeated series of 60-s exposures in the q,u,g,r,i,z bands following the sequence quqgqrqiqz. observations began... | grb 230405b: meerlicht upper limits |
a major goal of proposed future space observatories, such as the habitable world observatory, is to directly image and characterize earth-like planets around sun-like stars to search for habitability signatures requiring the starlight suppression (contrast) of 10−10. one of the significant aspects affecting this contra... | estimation of polarization aberrations and their effect on the coronagraphic performance for future space telescopes |
during the 2022-2023 academic year, the group v2-cemn of the participative astronomy course at ipsa worked in collaboration with a high-energy astronomer, helping him on the development and scientific exploitation of a citizen science experiment, claxson. claxson is a website on which people classify a variety of astro... | v2-cemn: identification of astrophysical x-ray sources |
a characteristic property of pulsars is pulsed periodic radio emission, which has a high stability of periods. despite the high stability of the emission periods of pulsars, monitoring the time of arrival of pulses (timing) shows the presence of different types of irregularities: variations of residual deviations, chan... | the specifics of pulsar radio emission |
astri-horn is a 4-m class cherenkov telescope located on mt. etna, serra la nave, italy, operated at the italian national institute for astrophysics (inaf) "m.g. fracastoro" observing station. it is the end-to-end prototype for the nine telescopes of the astri mini-array, a collaborative international effort led by ina... | astri-horn cherenkov gamma-ray telescope: the average reflectivity of the primary mirror based on and "ad hoc" multilayer coating |
x-ray spectroscopy underlies most of the discoveries by the current chandra and xmm observatories, the previous hitomi and upcoming xrism and athena missions. highresolution spectroscopy has proven even more powerful, as demonstrated by analyses of the 338 ks hitomi observation of the perseus cluster producing over a d... | atomdb: advancing spectral models for x-ray spectroscopy |
the solar wind earth exchange project (sweep) seeks to improve our understanding of the interaction of the solar wind with the earth. x-ray emission resulting from charge exchange between oxygen in the solar wind and magnetospheric neutral hydrogen is modelled for a series of observations from xmm-newton, an x-ray astr... | magnetospheric solar wind charge exchange - a comparison between the gumics-4 mhd model and xmm-newton. |
we report on the x-ray background rate measured with transition-edge sensors (tes) micro-calorimeters under frequency-domain multiplexing (fdm) readout as a possible technology for future experiments aiming at a direct detection of axion-like particles. future axion helioscopes will make use of large magnets to convert... | background rates of x-ray transition-edge sensor micro-calorimeters under a frequency domain multiplexing readout for solar axion-like particles' detection |
we observed the localization region of the short grb 230430a (trigger 704533643) detected by the gamma-ray burst monitor (gbm) on the fermi satellite with the palomar 48 inch telescope equipped with the 47 square degree zwicky transient facility (ztf; bellm et al., 2019; graham et al., 2019) camera. we obtained a serie... | grb 230430a: zwicky transient facility follow-up of a fermi short grb (trigger 704533643) |
we report the early-time optical observations of the afterglow of the first tev- detected gamma-ray burst (grb), grb 190114c, using the master global robotic net (with the very wide-field camera and master ii) and the liverpool telescope (with the ringo3 imager-polarimeter and the optical wide field camera). grb 190114... | vizier online data catalog: grb 190114c light curves (jordana-mitjans+, 2020) |
on 15 aug. 2023, during a regular survey work on the messier 31 (ngc 224) field, performed with the 0.25m-f/4.5 robotic unit part of the virtual telescope project facility in manciano, italy, we discovered a bright object on several unfiltered images, located at ra,dec=00 43 54.36, +40 46 34.0 (j2000.0 astrometry from ... | discovery of an optical transient with strong flaring activity: a new blazar candidate in the messier 31 field. |
we observed the field of the possibly short grb 230205a (ambrosi et al, gcn circ. 33271; sakamoto et al., gcn circ. 33280) with the schmidt telescope of the inaf - padova astronomical observatory located in asiago (italy). observations were carried out in imaging mode with the r and i filters about 2.5 days after the b... | grb 230205a: possible host galaxy detection with the schmidt - asiago telescope |
follow-up observations of the optical fast transient atlas23msn/ztf23aaoohpy/at2023lcr (swain et al., gcn 34022; gompertz et al., gcn34023; kumar et al., gcn34025; perley et al, gcn 34031; perley et al., gcn 34041; fulton et al., 34042; chen et al., gcn 34043) were carried out with the neil gehrels swift observatory st... | at2023lcr: neil gehrels swift observatory x-ray detection |
we observed the localization region of the short grb 230513a (trigger 705709044, gcn 33793) detected by the gamma-ray burst monitor (gbm) on the fermi satellite with the palomar 48 inch telescope equipped with the 47 square degree zwicky transient facility (ztf) camera. we obtained a series of g- and r-band images cove... | grb 230513a: zwicky transient facility follow-up of a fermi short grb (trigger 705709044) |
in the framework of the cherenkov telescope array (cta) observatory, the italian national institute of astrophysics (inaf) has recently inaugurated in sicily (italy), at the serra la nave astronomical site on the slopes of mount etna, a large field of view (fov, ~ 9.6°) dual-mirror prototype (astri sst-2m) of the cta s... | the mini-array of astri sst-2m telescopes, precursors for the cherenkov telescope array |
the solar radiation is the major source of energy on the surface of an airless body. as a consequence, insolation weathering can significantly contribute to rock breakdown, crater degradation, and regolith production [1]. estimation of illumination conditions and calculation of the surface radiative intensity on the su... | thermal impact of self-heating effect on airless surfaces. the case of mercury. |
*pyirf* is a python3-based library for the generation of instrument response functions (irfs) and sensitivities for the cherenkov telescope array (cta) | cta-observatory/pyirf: v0.6.0 – 2022-01-10 |
the 60cm bootes-5/jgt robotic telescope at observatorio astronomico nacional in san pedro martir (mexico) automatically responded in 54 s to the swift trigger of grb 210824a (page et al., gcnc 30700) , a burst which was also detected by fermi (fermi gbm team, gcnc 30699). in the co-added clear image (10 x 10 s), no opt... | grb 210824a: bootes-5/jgt optical upper limit |
the x-ray point source population outside the visible extent of galaxies as defined by rc3 d25 has been assumed by the greater astronomical community to be dominated by the resolved agn x-ray background. it is important to note however that this assumption was never rigorously tested though the analysis of observations... | an analysis of x-ray binary populations outside the visible extent of nearby galaxies |
we present monte carlo simulations of radiative transfer within the absorbers of x-ray microcalorimeters, utilizing a numerical model for the photon propagation and photon absorption process within the absorber structure. in our model, we include effects of compton scattering off bound electrons and fluorescence. scatt... | simulation of radiative transfer within x-ray microcalorimeter absorbers |
gorenstein was a pioneer in x-ray astronomy. he played a key role in the development of the primary detector for nasa's einstein observatory, the first non-solar x-ray telescope. | obituary: paul gorenstein (1934-2021) |
we observed the field of the fermi/lat grb 210704a (berretta et al. gcn circ. 30375, ursi et al. gcn circ. 30372, malacaria et al. gcn circ. 30380) with the ddoti wide-field imager at the observatorio astronómico nacional on sierra san pedro martir (http://ddoti.astroscu.unam.mx) starting from 2021-07-05 04:51 to 05:01... | grb 210704a: ddoti upper limit |
gamma-ray astronomy holds a great potential for astrophysics, particle physics and cosmology. the cta is an international initiative to build the next generation of ground-based gamma-ray observatories, which will represent a factor of 5-10× improvement in the sensitivity of observations in the range 100 gev - 10 tev, ... | status of the cherenkov telescope array project |
grb220430a (ambrosi et al., gcn 31972) triggered automatic observations with the 0.6m wide-field meerlicht telescope, located at sutherland, south africa. observations started at 2022-04-30, 17:10:19 ut in a series of 60s integrations in an alternating sequence of the u,g,q,r,i,z bands. observations were stopped after ... | grb 220430a: meerlicht optical upper limits |
sigmoid regions on the sun are often the regions that cause coronal mass ejections (cmes). large cmes most often have filaments that erupt with them. this study focuses on the statistical relevance of the shape of the sigmoid and the chirality of the filament residing in these sigmoids. the study further extends to the... | a survery of the correlation between filament chirality and sigmoid handedness |
the primary goals of this proposal are to produce, characterize, and determine optical properties of stardust analogs composed of aluminum and oxygen and to apply said optical properties to understanding dust formation around low- and intermediate-mass evolved stars by constructing astrophysical models. in particular, ... | laboratory and observational astronomical investigations of aluminum oxide analogs of stardust |
several new space-based observatories are planned and expected to start collecting data over the next two decades. these data will be of unprecedented quality as well as complexity, and will require utterly new techniques to extract maximum information. researchers old enough to remember the state of data analysis 20 o... | enhanced science from future x-ray missions: overcoming x-ray data analysis challenges |
following the detection by swift of a bright hard new x-ray and optical transient (dichiara et al., gcn 32632), the 0.6m wide-field meerlicht telescope, located at sutherland, south africa, started automatic observations of the bat error box beginning at 17:49:44 ut on 2022 october 9. observations consisted of 60s expo... | grb 221009a (swift j1913.1+1946): meerlicht observations |
many current outstanding questions in x-ray astronomy were addressed by lynx, an observatory concept that concluded its study phase in 2019. high-effective area, high angular resolution x-ray missions like lynx require thin (<= 0.5 mm thick) mirrors with precise surface figures to maintain high angular resolution (&... | thin-film pzt actuator performance in adjustable x-ray optic segments |
giacconi shared the 2002 nobel prize in physics for pioneering contributions to astrophysics. his work established the discipline of x-ray astronomy, revolutionized optical astronomy and was pivotal in establishing the world's foremost millimeter-wave observatory. | obituary: riccardo giacconi (1931-2018) |
we observed the field of the swift/bat-guano short grb candidate grb211106a (tohuvavohu et al., gcn 31049) with the 0.6m wide-field meerlicht optical telescope located at sutherland, south africa, taking 10x60s exposures in the q-band starting at 2021-11-06, 18:37:17 ut, approximately 14 hours after the grb trigger. we... | meerlicht follow-up of grb 211106a |
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