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a pressure–state–response framework was customized to outline the watershed health (wh) concept. to achieve this, the watershed indicators of pressure, state (s), and response (r) were conceptualized according to 17 climatic, anthropogenic, and hydrologic criteria. four node years of 1986, 1998, 2008, and 2014 were sel... | watershed health assessment using the pressure–state–response (psr) framework |
recent experimental and ab initio theory investigations of the 208pb neutron skin thickness have the potential to inform the neutron star equation of state. in particular, the strong correlation between the 208pb neutron skin thickness and the pressure of neutron matter at normal nuclear densities leads to modified pre... | neutron star radii, deformabilities, and moments of inertia from experimental and ab initio theory constraints of the 208pb neutron skin thickness |
the interstellar medium hosts a population of scattering screens, most of unknown origin. scintillation studies of pulsars provide a sensitive tool for resolving these scattering screens and a means of measuring their properties. in this paper, we report our analysis of 34 yr of arecibo observations of psr b1133 + 16, ... | probing the local interstellar medium with scintillometry of the bright pulsar b1133 + 16 |
the low-frequency polarisation properties of radio sources are poorly studied, particularly in statistical samples. however, the new generation of low-frequency telescopes, such as the murchison widefield array (the precursor for the low-frequency component of the square kilometre array) offers an opportunity to probe ... | the polarised gleam survey (pogs) i: first results from a low-frequency radio linear polarisation survey of the southern sky |
the recent discovery of gravitational-wave events has offered us unique test beds of gravity in the strong and dynamical field regime. one possible modification to general relativity is the gravitational parity violation that arises naturally from quantum gravity. such parity violation gives rise to the so-called ampli... | probing gravitational parity violation with gravitational waves from stellar-mass black hole binaries |
the five-hundred-meter aperture spherical radio telescope (fast) will become one of the world-leading telescopes for pulsar timing array (pta) research. the primary goals for ptas are to detect (and subsequently study) ultra-low-frequency gravitational waves, to develop a pulsar-based time standard and to improve solar... | the role of fast in pulsar timing arrays |
deep nustar observation of x-ray pulsar a 0535+262, performed at a very low luminosity of ∼7 × 1034 erg s-1, revealed the presence of two spectral components. we argue that the high-energy component is associated with cyclotron emission from recombination of electrons collisionally excited to the upper landau levels. t... | cyclotron emission, absorption, and the two faces of x-ray pulsar a 0535+262 |
in this paper, we construct anisotropic model representing salient features of strange stars in the framework of massive brans–dicke gravity. we formulate the field equations for tolman–kuchowicz ansatz by incorporating the mit bag model. junction conditions are applied on the boundary of the stellar model to evaluate ... | quark stars in massive brans–dicke gravity with tolman–kuchowicz spacetime |
context. classical supergiant x-ray binaries (sgxbs) and supergiant fast x-ray transients (sfxts) are two types of high-mass x-ray binaries (hmxbs) that present similar donors but, at the same time, show very different behavior in the x-rays. the reason for this dichotomy of wind-fed hmxbs is still a matter of debate. ... | measuring the stellar wind parameters in igr j17544-2619 and vela x-1 constrains the accretion physics in supergiant fast x-ray transient and classical supergiant x-ray binaries |
we have conducted a systematic survey for the x-ray properties of millisecond pulsars (msps). currently, there are 47 msps with confirmed x-ray detections. we have also placed the upper limits for the x-ray emission from the other 36 msps by using the archival data. we have normalized their x-ray luminosities lxand the... | x-ray census of millisecond pulsars in the galactic field |
despite more than 30 years of searching, the compact object in supernova (sn) 1987a has not yet been detected. we present new limits on the compact object in sn 1987a using millimeter, near-infrared, optical, ultraviolet, and x-ray observations from alma, vlt, hst, and chandra. the limits are approximately 0.1 mjy (0.1... | the 30 year search for the compact object in sn 1987a |
the globular cluster (gc) 47 tuc has recently been proposed to host an intermediate-mass black hole (imbh) or a population of stellar mass black holes (bhs). to shed light on its dark content, we present an application of self-consistent multimass models with a varying mass function and content of stellar remnants, whi... | on the black hole content and initial mass function of 47 tuc |
we describe a systematic search for x-ray counterparts of radio pulsars. the search was accomplished by cross-correlating the radio timing positions of all radio pulsars from the atnf pulsar database (version 1.54) with archival xmm-newton and chandra observations publicly released by july 1st 2016. in total, 178 of th... | a search for x-ray counterparts of radio pulsars |
the observed relation between the x-ray and radio properties of low-luminosity accreting black holes (bhs) has enabled the identification of multiple candidate black hole x-ray binaries (bhxbs) in globular clusters (gcs). here, we report an identification of the radio source vla j213002.08+120904 (aka m15 s2), recently... | the first low-mass black hole x-ray binary identified in quiescence outside of a globular cluster |
we study the problem of optimizing expensive blackbox functions over combinatorial spaces (e.g., sets, sequences, trees, and graphs). bocs (baptista and poloczek, 2018) is a state-of-the-art bayesian optimization method for tractable statistical models, which performs semi-definite programming based acquisition functio... | scalable combinatorial bayesian optimization with tractable statistical models |
in the canonical model of a pulsar, rotational energy is transmitted through the surrounding plasma via two electrical circuits, each connecting to the star over a small region known as a “polar cap.” for a dipole-magnetized star, the polar caps coincide with the magnetic poles (hence the name), but in general, they ca... | inclined pulsar magnetospheres in general relativity: polar caps for the dipole, quadrudipole, and beyond |
in the next decades, ultra-high-energy neutrinos in the eev energy range will be potentially detected by next-generation neutrino telescopes. although their primary goals are to observe cosmogenic neutrinos and to gain insight into extreme astrophysical environments, they can also indirectly probe the nature of dark ma... | heavy decaying dark matter at future neutrino radio telescopes |
in this work we revisit the quantum hadrodynamics (qhd) formalism to investigate hyperonic and hybrid stars with hyperon-meson couplings fixed via broken su(6) group, in favor of a more general flavor group su(3). we also employ an additional channel, the strangeness-hidden ϕ meson, which couples only to the hyperons. ... | broken su(6) symmetry and massive hybrid stars |
we present a population of 19 radio-luminous supernovae (sne) with emission reaching lν~ 1026-1029 erg s-1 hz-1 in the first epoch of the very large array sky survey (vlass) at 2-4 ghz. our sample includes one long gamma-ray burst, sn 2017iuk/grb 171205a, and 18 core-collapse sne detected at ≈1-60 yr after explosion. n... | luminous late-time radio emission from supernovae detected by the karl g. jansky very large array sky survey (vlass) |
high-precision measurements of the pulsar dispersion measure (dm) are possible using telescopes with low-frequency wideband receivers. we present an initial study of the application of the wideband timing technique, which can simultaneously measure the pulsar times of arrivals (toas) and dms, for a set of five pulsars ... | low-frequency wideband timing of inpta pulsars observed with the ugmrt |
we consider a simple extension of standard model by adding two complex singlet scalars with a u(1) symmetry. a discrete z2×z2' symmetry is imposed in the model and the added scalars acquire a non zero vacuum expectation value (vev) when the imposed symmetry is broken spontaneously. the real (cp even) parts of the compl... | gravitational wave signatures from domain wall and strong first-order phase transitions in a two complex scalar extension of the standard model |
context. the vela supernova remnant (snr) is one of the most nearby and extended objects in the x-ray sky. it constitutes a unique laboratory for studying the thermal and nonthermal x-ray emission from an evolved snr and its central plerion at an unprecedented level of detail.aims: our goal is to characterize the hot e... | a detailed look at the thermal and nonthermal x-ray emission from the vela supernova remnant with srg/erosita |
gravitational waves (gws) emanating from unstable quasi-normal modes in neutron stars (nss) could be accessible with the improved sensitivity of the current gw detectors or with the next-generation gw detectors and, therefore, can be employed to study the ns interior. assuming f-mode excitation in isolated pulsars with... | constraining nuclear parameters using gravitational waves from f-mode oscillations in neutron stars |
a new population of millisecond pulsars is a long-standing proposed explanation for the excess of gev-scale gamma rays emanating from the region surrounding the center of the milky way (the "galactic center excess"). we examine several simple parameterizations of possible luminosity functions for this population, as we... | luminosity functions consistent with a pulsar-dominated galactic center excess |
millisecond pulsars are perfect laboratories to test possible matter-geometry coupling and its physical implications in light of recent neutron star interior composition explorer (nicer) observations. we apply rastall field equations of gravity, where matter and geometry are nonminimally coupled, to krori-barua interio... | impact of rastall gravity on mass, radius, and sound speed of the pulsar psr j0740+6620 |
recent observations discovered that some repeating fast radio bursts (frbs) show complicated variations and reversals of faraday rotation measures (rms), indicating that the sources of these frbs are embedded in a dynamically magnetized environment. one possible scenario is that repeating frbs are generated by pulsars ... | rotation measure variations and reversals of repeating frbs in massive binary systems |
tempo analyzes pulsar timing data. pulse times of arrival (toas), pulsar model parameters, and coded instructions are read from one or more input files. the toas are fitted by a pulse timing model incorporating transformation to the solar-system barycenter, pulsar rotation and spin-down and, where necessary, one of sev... | tempo: pulsar timing data analysis |
a gravitational-wave background can be detected in pulsar-timing-array data as hellings-downs correlations among the timing residuals measured for different pulsars. the optimal statistic implements this concept as a classical null-hypothesis statistical test: a null model with no correlations can be rejected if the ob... | posterior predictive checking for gravitational-wave detection with pulsar timing arrays. i. the optimal statistic |
external magnetic fields impose diverse effects on low-temperature plasmas. we study these in a low-pressure capacitively coupled radio frequency plasma in argon via self-consistent kinetic simulations. the primary effect of the transversal magnetic field, that manifests itself in the trapping of electrons at lower exc... | magnetic attenuation of the self-excitation of the plasma series resonance in low-pressure capacitively coupled discharges |
the development of pressure sensor arrays capable of distinguishing the shape and texture details of objects is of considerable interest in the emerging fields of smart robots, prostheses, human-machine interfaces, and artificial intelligence (ai). here we report an integrated pressure sensor array, by combining soluti... | two-dimensional van der waals thin film transistors as active matrix for spatially resolved pressure sensing |
the international pulsar timing array (ipta) is a galactic-scale gravitational-wave observatory that monitors an array of millisecond pulsars. the timing precision of these pulsars is such that one can measure the correlated changes in pulse arrival times accurately enough to search for the signature of a stochastic gr... | the second international pulsar timing array mock data challenge |
the gravitational waves of hořava gravity, their polarization states, and their possible observational signatures are discussed. using the gauge-invariant variable formalism, we find the three polarization modes in hořava gravity excited by the three physical degrees of freedom contained in this theory. in particular, ... | gravitational waves and the polarizations in hořava gravity after gw170817 |
context radio continuum surveys of the galactic plane can find and characterize h ii regions, supernova remnants (snrs), planetary nebulae (pne), and extragalactic sources. a number of surveys at high angular resolution (≤25″) at different wavelengths exist to study the interstellar medium (ism), but no comparable high... | radio continuum emission in the northern galactic plane: sources and spectral indices from the thor survey |
we report the timing results for psr j2234+0611, a 3.6 ms pulsar in a 32 day, eccentric (e = 0.13) orbit with a helium white dwarf. the precise timing and eccentric nature of the orbit allow measurements of an unusual number of parameters: (a) a precise proper motion of 27.10(3) mas yr-1 and a parallax of 1.05(4) mas r... | psr j2234+0611: a new laboratory for stellar evolution |
the recent discovery of a mega-jansky radio burst occurring simultaneously with short x-ray bursts from the galactic magnetar (strongly magnetized neutron star (ns)) sgr 1935+2154 is a smoking gun for the hypothesis that some cosmological fast radio bursts (frbs) arise from magnetar bursts. we argue that the x-ray burs... | fast radio burst breakouts from magnetar burst fireballs |
neutron stars are unique cosmic laboratories in which fundamental physics can be probed in extreme conditions not accessible to terrestrial experiments. in particular, the precise timing of rotating magnetized neutron stars (pulsars) reveals sudden jumps in rotational frequency in these otherwise steadily spinning-down... | constraints on pulsar masses from the maximum observed glitch |
alpha magnetic spectrometer (ams-02) recently published its lepton spectra measurement. the results show that the positron fraction no longer increases above ∼ 200 gev. the aim of this work is to investigate the possibility that the excess of positron fraction is due to pulsars. nearby known pulsars from the atnf catal... | pulsar interpretation of lepton spectra measured by ams-02 |
in this work we have estimated upper and lower limits to the strength of the magnetic dipole moment of all 14 accreting millisecond x-ray pulsars observed with the rossi x-ray timing explorer (rxte). for each source we searched the archival rxte data for the highest and lowest flux levels with a significant detection o... | the magnetic-field strengths of accreting millisecond pulsars |
we report on the analysis of two deep xmm-newton observations of the magnetar swift j1834.9-0846 and its surrounding extended emission taken in 2014 march and october, 2.5 and 3.1 yr after the source went into outburst. the magnetar is only weakly detected in the first observation, with an absorption-corrected flux {f}... | the wind nebula around magnetar swift j1834.9-0846 |
we consider the x-ray properties of the redback class of eclipsing millisecond pulsars. these are transitional systems between accreting low-mass x-ray binaries and binary millisecond pulsars orbiting white dwarfs, and hence their companions are non-degenerate and nearly roche-lobe filling. the x-ray luminosity seems t... | x-ray studies of redbacks |
with an average density higher than the nuclear density, neutron stars (ns) provide a unique test-ground for nuclear physics, quantum chromodynamics (qcd), and nuclear superfluidity. determination of the fundamental interactions that govern matter under such extreme conditions is one of the major unsolved problems of m... | probing the neutron star interior and the equation of state of cold dense matter with the ska |
we present two methods for determining the significance of a stochastic gravitational-wave (gw) background affecting a pulsar-timing array, where detection is based on evidence for quadrupolar spatial correlations between pulsars. rather than constructing noise simulations, we eliminate the gwb spatial correlations in ... | all correlations must die: assessing the significance of a stochastic gravitational-wave background in pulsar timing arrays |
in this work, we consider the consequences of phase transition in dense qcd on the properties of compact stars and implications for the observational program in gravitational wave and x-ray astrophysics. the key underlying assumption of our modeling is a strong first-order phase transition past the point where the hadr... | ultracompact hybrid stars consistent with multimessenger astrophysics |
the crab pulsar's radio emission is unusual, consisting predominantly of giant pulses, with durations of about a microsecond but structure down to the nanosecond level, and brightness temperatures of up to 1037 k. it is unclear how giant pulses are produced, but they likely originate near the pulsar's light cylinder, w... | kinematics of crab giant pulses |
the latest ams-02 data on cosmic-ray electrons show a break in the energy spectrum around 40 gev, with a change in the slope of about 0.1. we perform a combined fit to the newest ams-02 positron and electron flux data above 10 gev using a semianalytical diffusion model where sources include production of pairs from pul... | novel interpretation of the latest ams-02 cosmic-ray electron spectrum |
the crab pulsar and its nebula are among the most studied astrophysical systems, and constitute one of the most promising environments where high-energy processes and particle acceleration can be investigated. they are the only objects for which significant x-ray polarization was detected in the past. here we present t... | simultaneous space and phase resolved x-ray polarimetry of the crab pulsar and nebula |
we propose pulsar, an efficient sphere-based differentiable renderer that is orders of magnitude faster than competing techniques, modular, and easy-to-use due to its tight integration with pytorch. differentiable rendering is the foundation for modern neural rendering approaches, since it enables end-to-end training o... | pulsar: efficient sphere-based neural rendering |
thanks to dedicated long-term missions like voyager and goes over the past 50 years, much insight has been gained on the activity of our sun, the solar wind, its interaction with the interstellar medium, and, thus, about the formation, the evolution, and the structure of the heliosphere. additionally, with the help of ... | astrospheres of planet-hosting cool stars and beyond ⋅ when modeling meets observations |
we perform magnetospheric studies in the modified gravity (mog) framework to investigate effects of mog on radio pulsar energetics with the main question being "can mog explain how radio pulsars turn into radio-quiet ones?" in order to realize our aim, first, we have obtained exact vacuum analytical solutions of maxwel... | can modified gravity silence radio-loud pulsars? |
we present the first systematic study of the gravitational collapse of rotating and magnetized neutron stars to charged and rotating (kerr-newman) black holes. in particular, we consider the collapse of magnetized and rotating neutron stars assuming that no pair-creation takes place and that the charge density in the m... | gravitational collapse to a kerr-newman black hole |
a charged compact star model has been determined for anisotropic fluid distribution. we have solved the einstein-maxwell field equations to construct the charged compact star model by using the radial pressure, the metric function e^{λ} and the electric charge function. the generic charged anisotropic solution is verif... | modeling of charged anisotropic compact stars in general relativity |
giant pulsar frequency glitches as detected in the emblematic vela pulsar have long been thought to be the manifestation of a neutron superfluid permeating the inner crust of a neutron star. however, this superfluid has been recently found to be entrained by the crust, and as a consequence it does not carry enough angu... | giant pulsar glitches and the inertia of neutron star crusts |
we report on the discovery of three new millisecond pulsars (msps; namely j1748-2446aj, j1748-2446ak, and j1748-2446al) in the inner regions of the dense stellar system terzan 5. these pulsars have been discovered thanks to a method, alternative to the classical search routines, that exploited the large set of archival... | discovery of three new millisecond pulsars in terzan 5 |
the milky way centre exhibits an intense flux in the gamma and x-ray bands, whose origin is partly ascribed to the possible presence of a large population of millisecond pulsars (msps) and cataclysmic variables (cvs), respectively. however, the number of sources required to generate such an excess is much larger than w... | gamma-ray and x-ray emission from the galactic centre: hints on the nuclear star cluster formation history |
the presence of neutron stars in at least three ultraluminous x-ray sources is now firmly established and offers an unambiguous view of super-critical accretion. all three systems show long-time-scale periods (60-80 d) in the x-rays and/or optical, two of which are known to be super-orbital in nature. should the flow b... | lense-thirring precession in ulxs as a possible means to constrain the neutron star equation of state |
we have observed and analysed the eclipses of the black widow pulsar j1810+1744 at low radio frequencies. using low-frequency array (lofar) and westerbork synthesis radio telescope observations between 2011 and 2015, we have measured variations in flux density, dispersion measure, and scattering around eclipses. high-t... | the low-frequency radio eclipses of the black widow pulsar j1810+1744 |
the pulsar/massive star binary system psr b1259-63/ls 2883 is one of the best-studied gamma-ray binaries, a class of systems whose bright gamma-ray flaring can provide important insights into high-energy physics. using the australian long baseline array, we have conducted very long baseline interferometric observations... | the geometric distance and binary orbit of psr b1259-63 |
we show that the fine structure of the electron spectrum in cosmic rays, especially the excess claimed by ams-02 at energies ≳42 gev , is fully accounted for in terms of inverse compton losses in the photon background dominated by ultraviolet, infrared, and cosmic microwave background photons, plus the standard synchro... | signature of energy losses on the cosmic ray electron spectrum |
the recent discovery by bachetti et al. of a pulsar in m82 that can reach luminosities of up to 1040 erg s-1, a factor of ∼100 times the eddington luminosity for a 1.4 m⊙ compact object, poses a challenge for accretion physics. in order to better understand the nature of this source and its duty cycle, and in light of ... | spectral and temporal properties of the ultraluminous x-ray pulsar in m82 from 15 years of chandra observations and analysis of the pulsed emission using nustar |
the sensitivity of pulsar timing arrays to gravitational waves (gws) depends on the noise present in the individual pulsar timing data. noise may be either intrinsic or extrinsic to the pulsar. intrinsic sources of noise will include rotational instabilities, for example. extrinsic sources of noise include contribution... | the noise properties of 42 millisecond pulsars from the european pulsar timing array and their impact on gravitational-wave searches |
we observed the nearby millisecond pulsar j2124-3358 with the hubble space telescope in broad far-uv (fuv) and optical filters. the pulsar is detected in both bands with fluxes f(1250-2000 å) = (2.5 ± 0.3) × 10-16 erg s-1 cm-2 and f(3800-6000 å) = (6.4 ± 0.4) × 10-17 erg s-1 cm-2, which corresponds to luminosities of ≈... | hubble space telescope detection of the millisecond pulsar j2124-3358 and its far-ultraviolet bow shock nebula |
milagro observations have found bright, diffuse tev emission concentrated along the galactic plane of the milky way. the intensity and spectrum of this emission is difficult to explain with current models of hadronic γ -ray production, and has been named the "tev excess." we show that tev emission from pulsars naturall... | pulsar tev halos explain the diffuse tev excess observed by milagro |
we propose to use pulsar-black hole binaries as a probe of gravitational collider physics. induced by the gravitation of the pulsar, the atomic transitions of the boson cloud around the black hole backreact on the orbital motion. this leads to the deviation of the binary period decrease from that predicted by general r... | gravitational collider physics via pulsar-black hole binaries |
it has been proposed that a large population of unresolved millisecond pulsars (msps) could potentially account for the excess of gev-scale gamma-rays observed from the region surrounding the galactic center. the viability of this scenario depends critically on the gamma-ray luminosity function of this source populatio... | the gamma-ray luminosity function of millisecond pulsars and implications for the gev excess |
we have constructed timing solutions for 81 γ-ray pulsars covering more than five years of fermi data. the sample includes 37 radio-quiet or radio-faint pulsars which cannot be timed with other telescopes. these timing solutions and the corresponding pulse times of arrival are prerequisites for further study, e.g., pha... | timing gamma-ray pulsars with the fermi large area telescope: timing noise and astrometry |
we investigate whether current data on the distribution of observed flux densities of fast radio bursts (frbs) are consistent with a constant source density in euclidean space. we use the number of frbs detected in two surveys with different characteristics along with the observed signal-to-noise ratios of the detected... | the euclidean distribution of fast radio bursts |
x-ray polarimetry is a unique way to probe the geometrical configuration of highly magnetized accreting neutron stars (x-ray pulsars). gro j1008−57 is the first transient x-ray pulsar observed at two different flux levels by the imaging x-ray polarimetry explorer (ixpe) during its outburst in november 2022. we find the... | x-ray pulsar gro j1008−57 as an orthogonal rotator |
in this paper, we explore from a conceptual standpoint the possibility of using natural astrophysical sources to accelerate spacecraft to relativistic speeds. we focus on light sails and electric sails, which are reliant on momentum transfer from photons and protons, respectively, because these two classes of spacecraf... | propulsion of spacecraft to relativistic speeds using natural astrophysical sources |
the companions of evaporating binary pulsars (black widows and related systems) show optical emission suggesting strong heating. in a number of cases, large observed temperatures and asymmetries are inconsistent with direct radiative heating for the observed pulsar spindown power and expected distance. here we describe... | b-ducted heating of black widow companions |
nasa's neutron star interior composition explorer (nicer) observed x-ray emission from the pulsar psr j0030+0451 in 2018. riley et al. reported bayesian parameter measurements of the mass and the star's radius using pulse-profile modeling of the x-ray data. this paper reproduces their result using the open-source softw... | reproducing the results for nicer observation of psr j0030+0451 |
we introduce pinta, a pipeline for reducing the upgraded giant metre-wave radio telescope (ugmrt) raw pulsar timing data, developed for the indian pulsar timing array experiment. we provide a detailed description of the workflow and usage of pinta, as well as its computational performance and rfi mitigation characteris... | pinta: the ugmrt data processing pipeline for the indian pulsar timing array |
gravitational wave (gw) detections have considerably enriched our understanding of the universe. to date, all gw events from individual sources have been found by interferometer-type detectors. in this paper, we study a gw detection technique based on astrometric solutions from photometric surveys and demonstrate that ... | gravitational wave detection with photometric surveys |
aims: most pulsar nulling observations have been conducted at frequencies lower than 1400 mhz. we aim to understand the nulling behaviors of pulsars at relatively high frequencies, and to decipher whether or not nulling is caused by a global change in the pulsar magnetosphere.methods: we used the jiamusi 66 m telescope... | jiamusi pulsar observations. iii. nulling of 20 pulsars |
the stability and equation of state of quark matter are studied within both two-flavor and (2 +1 )-flavor nambu-jona-lasinio (njl) models including the vector interactions. with a free parameter α , the lagrangian is constructed by two parts, the original njl lagrangian and the fierz transformation of it, as l =(1 -α )... | interacting u d and u d s quark matter at finite densities and quark stars |
in general relativity (gr), gravitational waves (gws) propagate the well-known plus and cross tensorial polarization modes, which are the signature of a massless spin-2 field. however, diffraction of gws caused by intervening objects along the line of sight can cause the apparent rise of additional polarizations due to... | polarization distortions of lensed gravitational waves |
the detection of the stochastic gravitational wave background (sgwb) is essential for understanding black hole populations, especially for supermassive black hole binaries. the recent promising results from various pulsar timing array (pta) collaborations allude to an imminent detection. in this paper, we investigate t... | constraining the stochastic gravitational wave background with photometric surveys |
the decay of rydberg-atom-ion molecules (raims) due to nonadiabatic couplings between electronic potential-energy surfaces is investigated. we employ the born-huang representation and perform numerical simulations using a crank-nicolson algorithm. the nonadiabatic lifetimes of rubidium raims for the lowest ten vibratio... | pulsar microstructure: periodicities, polarization and probes of pulsar magnetospheres |
incredible progress on the theoretical uncertainty of the spatial correlations of the stochastic gravitational wave (gw) background were recently made. however, it remains to realize the impact of this theoretical uncertainty on pta cross correlations analysis. this paper pushes forward in this direction, as a proof-of... | hunting the stochastic gravitational wave background in pulsar timing array cross correlations through theoretical uncertainty |
geminga is an enigmatic radio-quiet γ-ray pulsar located at a mere 250 pc distance from earth. extended very-high-energy γ-ray emission around the pulsar was discovered by milagro and later confirmed by hawc, which are both water cherenkov detector-based experiments. however, evidence for the geminga pulsar wind nebula... | detection of extended γ-ray emission around the geminga pulsar with h.e.s.s. |
the class of scalar-tensor theories with the scalar field coupling to the gauss-bonnet invariant has drawn great interest since solutions of spontaneous scalarization were found for black holes in these theories. we contribute to the existing literature a detailed study of the spontaneously scalarized neutron stars (ns... | neutron stars in massive scalar-gauss-bonnet gravity: spherical structure and time-independent perturbations |
the parabolic structure of the secondary or conjugate spectra of pulsars is often the result of isolated one-dimensional (or at least highly anisotropic) lenses in the interstellar medium (ism). the curvature of these features contains information about the velocities of the earth, ism, and pulsar along the primary axi... | interstellar interferometry: precise curvature measurement from pulsar secondary spectra |
binaries harbouring millisecond pulsars (msps) enable a unique path to determine neutron star (ns) masses: radio pulsations reveal the motion of the ns, while that of the companion can be characterized through studies in the optical range. psr j1012+5307 is an msp in a 14.5-h orbit with a helium-core white dwarf (wd) c... | psr j1012+5307: a millisecond pulsar with an extremely low-mass white dwarf companion |
we present herein a new class of singularity-free interior solutions to describe realistic anisotropic compact stellar objects with spherically symmetric matter distribution. a specific form of anisotropy is assumed to obtain the exact solution for the field equation. smooth matching of interior solutions thus obtained... | anisotropic compact stellar solution in general relativity |
the maxi/gsc nova alert system triggered a bright x-ray transient source on 2022 december 29 (mjd 59942). assuming that the source flux was constant over the transits, we obtain the source position at (r.a., dec) = (70.253 deg, 44.378 deg) = (04 41 00, +44 22 40) (j2000) with a 90% c.l. statistical error of 0.13 deg an... | maxi/gsc detection of an x-ray brightening from the be/x-ray binary pulsar ls v +44 17 |
we aim at contributing to the resolution of three of the fundamental puzzles related to the still unsolved problem of the structure of the dense core of compact stars (cs): (i) the hyperon puzzle: how to reconcile pulsar masses of 2 m⊙ with the hyperon softening of the equation of state (eos); (ii) the masquerade probl... | high-mass twins & resolution of the reconfinement, masquerade and hyperon puzzles of compact star interiors |
rotating neutron star or pulsar can be a possible source of pseudo nambu goldstone bosons or axions which can mediate long range axionic hair outside of the pulsar. when the electromagnetic radiation is emitted from a pulsar and passes through the long range axion hair, the axion rotates the polarization of the electro... | probing the angle of birefringence due to long range axion hair from pulsars |
the crab nebula is one of the most-studied cosmic particle accelerators, shining brightly across the entire electromagnetic spectrum up to very-high-energy gamma rays1,2. it is known from observations in the radio to gamma-ray part of the spectrum that the nebula is powered by a pulsar, which converts most of its rotat... | resolving the crab pulsar wind nebula at teraelectronvolt energies |
we explore the impact of pulsar electromagnetic dipole and fallback accretion emission on the luminosity of a suite of kilonova models. the pulsar models are varied over pulsar magnetic field strength, pulsar lifetime, ejecta mass, and elemental abundances; the fallback models are varied over fallback accretion rate an... | impact of pulsar and fallback sources on multifrequency kilonova models |
context. the observation of the first pulse-to-pulse glitch in the vela pulsar opens a new window among theoretical speculations on the internal dynamics of neutron stars as it allows us for testing models to factor in the circumstances of the first moments of a glitch. several works in the literature have already cons... | bayesian estimate of the superfluid moments of inertia from the 2016 glitch in the vela pulsar |
fast radio bursts (frbs) have excessive dispersion measures (dms) and an all-sky distribution, which point toward an extragalactic or even a cosmological origin. we develop a method to extract the mean host galaxy dm (< {{dm}}{hg,{loc}}> ) and the characterized luminosity (l) of frbs using the observed dm-flux da... | large host-galaxy dispersion measure of fast radio bursts |
we present evidence for three spin-down glitches (or “anti-glitches”) in the ultraluminous accreting x-ray pulsar ngc 300 ulx-1, in timing observations made with the neutron star interior composition explorer. our timing analysis reveals three sudden spin-down events of magnitudes δν = -23, -30, and -43 μhz (fractional... | anti-glitches in the ultraluminous accreting pulsar ngc 300 ulx-1 observed with nicer |
we report observations of gamma-ray emissions with energies in the 100-tev energy region from the cygnus region in our galaxy. two sources are significantly detected in the directions of the cygnus ob1 and ob2 associations. based on their positional coincidences, we associate one with a pulsar psr j 2032 +4127 and the ... | gamma-ray observation of the cygnus region in the 100-tev energy region |
psr j1024-0719 is a millisecond pulsar that was long thought to be isolated. however, puzzling results concerning its velocity, distance, and low rotational period derivative have led to a reexamination of its properties. we present updated radio timing observations along with new and archival optical data which show t... | psr j1024-0719: a millisecond pulsar in an unusual long-period orbit |
black holes in binaries with other compact objects can provide natural venues for indirect detection of axions or other ultralight fields. the superradiant instability associated with a rapidly spinning black hole leads to the creation of an axion cloud which carries energy and angular momentum from the black hole. thi... | accessing the axion via compact object binaries |
we introduce a technique for gravitational-wave analysis, where gaussian process regression is used to emulate the strain spectrum of a stochastic background by training on population-synthesis simulations. this leads to direct bayesian inference on astrophysical parameters. for pulsar timing arrays specifically, we in... | constraints on the dynamical environments of supermassive black-hole binaries using pulsar-timing arrays |
we report on multifrequency radio observations of the new magnetar swift j1818.0-1607, following it for more than one month with high cadence. the observations commenced less than 35 h after its registered first outburst. we obtained timing, polarization, and spectral information. swift j1818.0-1607 has an unusually st... | high-cadence observations and variable spin behaviour of magnetar swift j1818.0-1607 after its outburst |
the diffuse backgrounds of relic gravitons with frequencies ranging between the ahz band and the ghz region encode the ultimate information on the primeval evolution of the plasma and on the underlying theory of gravity well before the electroweak epoch. while the temperature and polarization anisotropies of the microw... | primordial backgrounds of relic gravitons |
the radio emission in many pulsars shows sudden changes, usually within a period, that cannot be related to the steady state processes within the inner acceleration region (iar) above the polar cap. these changes are often quasi-periodic in nature, where regular transitions between two or more stable emission states ar... | rapid modification of neutron star surface magnetic field: a proposed mechanism for explaining radio emission state changes in pulsars |
supernova remnants (snrs) have long been considered to be the dominant source of galactic cosmic rays, which implied that they provided most of the energy to power cosmic rays as well as being pevatrons. the lack of evidence for pev cosmic rays in snrs, as well as theoretical considerations, has made this scenario unte... | what sources are the dominant galactic cosmic-ray accelerators? |
the recent observation of 4he favors a large lepton asymmetry at the big bang nucleosynthesis. if q-balls with a lepton charge decay after the electroweak phase transition, such a large lepton asymmetry can be generated without producing too large baryon asymmetry. in this scenario, q-balls dominate the universe before... | enhancement of second-order gravitational waves at q-ball decay |
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