The Spectrum of Diffuse Cosmic Hard X-Rays Measured with HEAO-1

Abstract

The spectrum of the diffuse isotropic component of cosmic X-rays over the 13-180 keV range was determined by the UCSD/MIT Hard X-Ray and Gamma-Ray instrument (HEAO A4) on the High Energy Astronomical Observatory-1 (HEAO-1). The instrument consists of a complex of actively shielded and collimated scintillation counters, including the Low Energy Detector set from which the data reported here were obtained. These data join smoothly with the spectrum at lower energies reported by the GSFC HEAO A2 instrument and with that measured to 400 keV by the HEAO A4 Medium Energy Detectors. The HEAO data set also joins the recent results from COMPTEL on the Compton Gamma-Ray Observatory in the 1-10 MeV range, which failed to confirm the existence of an "MeV bump" in this range. Although the spectrum over the entire range 3 keV < E < 100 GeV can be fit by a simple empirical analytic expression, the origin is likely due to a number of distinct source components. The prevailing idea for the origin is that the hard X-ray spectrum is due to X-rays from various AGN components, particularly Seyfert galaxies extending to cosmological distances, and that the low energy gamma-rays may be due to emission from type 1a Supernovae, also integrated to cosmological distances. The higher energy gamma-ray spectrum defined by EGRET, also on the CGRO, may be due to unresolved gamma-ray emitting blazars. Models of production by these source components, extrapolated to the present epoch, must reproduce the observationally derived spectrum.

LaTeX, 16pp, 3figs

Cited by in corpus (276)

• A Unified, Merger-Driven Model for the Origin of Starbursts, Quasars, the Cosmic X-Ray Background, Supermassive Black Holes and Galaxy Spheroids
• New cosmological constraints on primordial black holes
• An Observational Determination of the Bolometric Quasar Luminosity Function
• Cosmological Evolution of the Hard X-ray AGN Luminosity Function and the Origin of the Hard X-ray Background
• The synthesis of the cosmic X-ray background in the Chandra and XMM-Newton era
• The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
• Toward the Standard Population Synthesis Model of the X-Ray Background: Evolution of X-Ray Luminosity and Absorption Functions of Active Galactic Nuclei Including Compton-Thick Populations
• The Cosmic Energy Inventory
• The SRG X-ray orbital observatory, its telescopes and first scientific results
• A White Paper on keV Sterile Neutrino Dark Matter
• The Space Density of Compton Thick AGN and the X-ray Background
• The Bolometric Quasar Luminosity Function at z = 0-7
• The enhanced X-ray Timing and Polarimetry mission - eXTP
• Swift BAT Survey of AGN
• A Cosmic UV/X-ray Background Model Update
• Quasars: the characteristic spectrum and the induced radiative heating
• Dark Matter and Background Light
• Cosmic X-ray background and Earth albedo Spectra with Swift/BAT
• Constraints on sterile neutrino as a dark matter candidate from the diffuse X-ray background
• A Compton-thick Wind in the High Luminosity Quasar, PDS 456
• INTEGRAL observations of the cosmic X-ray background in the 5-100 keV range via occultation by the Earth
• Where to find a dark matter sterile neutrino?
• The Evolution of Swift/BAT blazars and the origin of the MeV background
• Testing current synthesis models of the X-ray background
• An absorption origin for the X-ray spectral variability of MCG-6-30-15
• Contribution of the Gamma-ray Loud Radio Galaxies Core Emissions to the Cosmic MeV and GeV Gamma-Ray Background Radiation
• Ultra-fast outflows in radio-loud active galactic nuclei
• Study of Nonthermal Emission from SNR RX J1713.7-3946 with Suzaku
• New Constraints on Sterile Neutrino Dark Matter from $NuSTAR$ M31 Observations
• New synthesis models of consistent extragalactic background light over cosmic time
• Anisotropy of the cosmic gamma-ray background from dark matter annihilation
• Alternative explanations for extreme supersolar iron abundances inferred from the energy spectrum of Cygnus X-1
• Direct X-ray Constraints on Sterile Neutrino Warm Dark Matter
• NuSTAR and Suzaku observations of the hard state in Cygnus X-1: locating the inner accretion disk
• X-ray Temperature and Mass Measurements to the Virial Radius of Abell 1413 with Suzaku
• Constraining DM properties with SPI
• A Suzaku survey of Fe K lines in Seyfert 1 AGN
• Constraining the fraction of Compton-thick AGN in the Universe by modelling the diffuse X-ray background spectrum
• The Blazar Sequence and the Cosmic Gamma-Ray Background Radiation in the Fermi Era
• Multiwavelength Observations of the Powerful Gamma-ray Quasar PKS 1510-089: Clues on the Jet Composition
• Near future MeV telescopes can discover asteroid-mass primordial black hole dark matter
• Restrictions on parameters of sterile neutrino dark matter from observations of galaxy clusters
• Study of the Spectral and Temporal Characteristics of X-Ray Emission of the Gamma-Ray Binary LS 5039 with Suzaku
• The Chandra COSMOS legacy survey: Energy Spectrum of the Cosmic X-ray Background and constraints on undetected populations
• Connecting Galaxy Evolution, Star Formation and the X-ray Background
• Simultaneous multiwavelength observations of the blazar 1ES1959+650 at a low TeV flux
• The Palermo Swift-BAT Hard X-ray Catalogue. II- Results after 39 months of sky survey
• NuSTAR Tests of Sterile-Neutrino Dark Matter: New Galactic Bulge Observations and Combined Impact
• BAT X-ray Survey - III: X-ray Spectra and Statistical Properties
• The cosmic X-ray background and the population of the most heavily obscured AGNs
• INTEGRAL hard X-ray spectra of the cosmic X-ray background and Galactic ridge emission
• Iron line profiles in Suzaku spectra of bare Seyfert galaxies
• The (un)resolved X-ray background in the Lockman Hole
• On high-energy particles in accretion disk coronae of supermassive black holes: implications for MeV gamma rays and high-energy neutrinos from AGN cores
• The variable hard X-ray emission of NGC4945 as observed by NuSTAR
• Breakdown of Hawking Evaporation opens new Mass Window for Primordial Black Holes as Dark Matter Candidate
• The Spectrum of the Universe
• The NuSTAR Extragalactic Surveys: The Number Counts of Active Galactic Nuclei and the Resolved Fraction of the Cosmic X-ray Background
• Analysis of NuSTAR and Suzaku observations of Cyg X-1 in the hard state: evidence for a truncated disc geometry
• Long-Exposure NuSTAR Constraints on Decaying Dark Matter in the Galactic Halo
• Spectral variability and reverberation time delays in the Suzaku X-ray spectrum of NGC 4051
• The Variable X-ray Spectrum of Markarian 766 - II. Time-Resolved Spectroscopy
• Circumscribing Late Dark Matter Decays Model Independently
• X-ray background synthesis: the infrared connection
• X-ray and gamma-ray limits on the primordial black hole abundance from Hawking radiation
• The INTEGRAL Complete Sample of Type 1 AGN
• Extragalactic Inverse Compton Light from Dark Matter Annihilation and the Pamela Positron Excess
• Lifting the Veil on Obscured Accretion: Active Galactic Nuclei Number Counts and Survey Strategies for Imaging Hard X-ray Missions
• Sterile neutrinos as subdominant warm dark matter
• X-ray photons from late-decaying majoron dark matter
• Non-thermal Cosmic Backgrounds from Blazars: the contribution to the CMB, X-ray and gamma-ray Backgrounds
• Revealing the High Energy Emission from the Obscured Seyfert Galaxy MCG -5-23-16 with Suzaku
• Probing the Disk-jet Connection of the Radio Galaxy 3C120 Observed with Suzaku
• Mass without radiation: heavily obscured AGN, the X-ray Background and the Black Hole Mass Density
• The Suzaku Observation of the Nucleus of the Radio-Loud Active Galaxy Centaurus A: Constraints on Abundances of the Accreting Material
• Assessing black hole spin in deep Suzaku observations of Seyfert 1 AGN
• A Tale of Two Populations: The Contribution of Merger and Secular Processes to the Evolution of Active Galactic Nuclei
• The Cosmic MeV Gamma-ray Background and Hard X-ray Spectra of Active Galactic Nuclei: Implications for the Origin of Hot AGN Coronae
• Simultaneous Multiwavelength observation of Mkn 501 in a low state in 2006
• Gamma-Ray Burst Polarimeter - GAP - aboard the Small Solar Power Sail Demonstrator IKAROS
• A New Direction in Dark-Matter Complementarity: Dark-Matter Decay as a Complementary Probe of Multi-Component Dark Sectors
• Improved Limits on Sterile Neutrino Dark Matter using Full-Sky Fermi Gamma-Ray Burst Monitor Data
• Suzaku Observation of a Hard Excess in 1H 0419-577: Detection of a Compton-Thick Partial-Covering Absorber
• Origin of the X-Ray Background and AGN Unification: New Perspectives
• Resolving Cosmic Gamma Ray Anomalies with Dark Matter Decaying Now
• Spatially Resolving a Starburst Galaxy at Hard X-ray Energies: NuSTAR, Chandra, AND VLBA Observations of NGC 253
• Dark Matter Annihilation: the origin of cosmic gamma-ray background at 1-20 MeV
• Low energy cut-offs and hard X-ray spectra in high-z radio-loud quasars: the Suzaku view of RBS315
• Cosmological beam dump: constraints on dark scalars mixed with the Higgs boson
• Suzaku Observations of Moderately Obscured (Compton-thin) Active Galactic Nuclei Selected by Swift/BAT Hard X-ray Survey
• Cumulative hard X-ray spectrum of local AGN: a link to the cosmic X-ray background
• Searching for mid-IR obscured AGN in the CDF-N
• The Hard X-ray 20-40 keV AGN Luminosity Function
• The Evolution and Eddington Ratio Distribution of Compton Thick Active Galactic Nuclei
• A Suzaku Search for Non-thermal Emission at Hard X-ray Energies in the Coma Cluster
• MGGPOD: a Monte Carlo Suite for Modeling Instrumental Line and Continuum Backgrounds in Gamma-Ray Astronomy
• Background simulations for the Large Area Detector onboard LOFT
• Measuring the Broad-band X-Ray Spectrum from 400 eV to 40 keV in the Southwest Part of the Supernova Remnant RX J1713.7-3946
• The MicroJansky Radio Galaxy Population
• Suzaku wide-band X-ray Spectroscopy of the Seyfert 2 AGN in NGC 4945
• Dark matter with two- and many-body decays and supernovae type Ia
• NGC454: unveiling a new "changing look" AGN
• The NuSTAR Extragalactic Surveys: Initial Results and Catalog from the Extended Chandra Deep Field South
• Compton Thick AGN in the 70 Month Swift-BAT All-Sky Hard X-ray Survey: a Bayesian approach
• Suzaku Studies of Wide-Band Spectral Variability of the Bright Type I Seyfert Galaxy Markarian 509
• Impeded Dark Matter
• Balancing the Cosmic Energy Budget: The Cosmic X-ray Background, Blazars and the Compton Thick AGN Fraction
• SGR 1806-20 about two years after the giant flare: Suzaku, XMM-Newton and INTEGRAL observations
• "Revealing a Population of Heavily Obscured Active Galactic Nuclei at z=0.5-1 in the Chandra Deep Field-South
• X-Ray Evolution of Active Galactic Nuclei and Hierarchical Galaxy Formation
• Primordial regular black holes as all the dark matter. II. Non-time-radial-symmetric and loop quantum gravity-inspired metrics
• The Nature of the Stable Soft X-ray Emissions in Several Types of Active Galactic Nuclei Observed by Suzaku
• Primordial regular black holes as all the dark matter. I. Time-radial-symmetric metrics
• X-ray Characteristics of NGC 3516: A View through the Complex Absorber
• Intensity of the cosmic X-ray backgound from HEAO1/A2 experiment
• X-Ray Spectral Variability of the Seyfert Galaxy NGC 4051 Observed with Suzaku
• The MOSDEF Survey: The Metallicity Dependence of X-ray Binary Populations at $z\sim 2$
• Phenomenological Constraints on Axion Models of Dynamical Dark Matter
• X-ray and Optical Correlation of Type I Seyfert NGC 3516 Studied with Suzaku and Japanese Ground-Based Telescopes
• Study of Swift/BAT Selected Low-luminosity Active Galactic Nuclei Observed with Suzaku
• Isotropic X-ray bound on Primordial Black Hole Dark Matter
• The XMM-Newton deep survey in the Chandra Deep Field South. III. Point source catalogue and number counts in the hard X-rays
• Suzaku Observations of M82 X-1 : Detection of a Curved Hard X-ray Spectrum
• Constraints on light bending and reflection from the hard X-ray background
• Variability of the High Velocity Outflow in the Quasar PDS 456
• Dark stars: Implications and constraints from cosmic reionization and extragalactic background radiation
• Updated Constraints on Primordial Black Hole Evaporation
• Light Dark Matter from Leptogenesis
• Cosmic gamma-ray background from Type Ia supernovae revisited: Evidence for missing gamma-rays at MeV
• Estimate of the Background and Sensitivity of theFollow-up X-ray Telescope onboard Einstein Probe
• Broad Band X-Ray Spectra of Two Low-luminosity Active Galactic Nuclei NGC 1566 and NGC 4941
• The Calan-Yale Deep Extragalactic Research (CYDER) Survey: Optical Properties and Deep Spectroscopy of Serendipitous X-ray Sources
• A strong excess in the 20-100 keV emission of NGC 1365
• Suzaku Wide Band Analysis of the X-ray Variability of TeV Blazar Mrk 421 in 2006
• NuSTAR J033202-2746.8: direct constraints on the Compton reflection in a heavily obscured quasar at z~2
• Gamma-ray diagnostics of Type Ia supernovae: Predictions of observables from three-dimensional modeling
• Can the unresolved X-ray background be explained by emission from the optically-detected faint galaxies of the GOODS project?
• Evidence for a Truncated Accretion Disc in the Low Luminosity Seyfert Galaxy, NGC 7213?
• Suzaku Observations of Iron Lines and Reflection in AGN
• Cosmological Lower Bound on Dark Matter Masses from the Soft Gamma-ray Background
• NuSTAR observations of heavily obscured Swift/BAT AGN: constraints on the Compton-thick AGN fraction
• A deep INTEGRAL hard X-ray survey of the 3C 273/Coma region
• Polarization of X-ray lines from galaxy clusters and elliptical galaxies - a way to measure tangential component of gas velocity
• Suzaku View of the Swift/Bat Active Galactic Nuclei. IV. Nature of Two Narrow-Line Radio Galaxies (3C 403 and IC 5063)
• eXTP perspectives for the $\nu$MSM sterile neutrino dark matter model
• The X-ray background and the deep X-ray surveys
• The Deep Chandra Survey of the Groth Strip - II. optical identification of the X-ray sources
• NuSTAR measurement of the cosmic X-ray background in the 3-20 keV energy band
• Suzaku Studies of the Central Engine in the Typical Type I Seyfert NGC 3227: Detection of Multiple Primary X-ray Continua with Distinct Properties
• Suzaku Observation of HCG 62: Temperature, Abundance, and Extended Hard X-ray Emission Profiles
• A Suzaku Observation of NGC 4593: Illuminating the Truncated Disk
• The Suzaku Observation of NGC 3516: Complex Absorption and the Broad and Narrow Fe K Lines
• Starburst Galaxies and the X-Ray Background
• A Suzaku X-ray observation of one orbit of the supergiant fast X-ray transient IGR J16479-4514
• A Hard X-Ray View of Two Distant VHE Blazars: 1ES 1101-232 and 1ES 1553+113
• Hunting for Dark Matter and New Physics with GECCO
• Integral/Ibis Census of the Sky Beyond 100 kev
• Revisiting the Fermionic Dark Matter Absorption on Electron Target
• Indirect Detection of eV Dark Matter via Infrared Spectroscopy
• Suzaku Discovery of a Hard Component Varying Independently of the Power-Law Emission in MCG-6-30-15
• INTEGRAL 11-year hard X-ray survey above 100 keV
• Probing the Cosmic X-ray and MeV Gamma-ray Background Radiation through the Anisotropy
• The Cosmic History of Black Hole Growth from Deep Multiwavelength Surveys
• Expected performance of a hard X-ray polarimeter (POLAR) by Monte Carlo Simulation
• Entering the Era of Dark Matter Astronomy? Near to Long-Term Forecasts in X-Ray and Gamma-Ray Bands
• Evidence for a circum-nuclear and ionised absorber in the X-ray obscured BroadLine Radio Galaxy 3C 445
• Suzaku reveals X-ray continuum piercing the nuclear absorber in Markarian 231
• Decoupling absorption and continuum variability in the Seyfert 2 NGC 4507
• The large-scale bias of the hard X-ray background
• Accretion History of AGN II: Constraints on AGN Spectral Parameters using the Cosmic X-ray Background
• Superradiant pion clouds around primordial black holes
• Suzaku View of the Swift/BAT Active Galactic Nuclei. V. Torus Structure of Two Luminous Radio-loud AGNs (3C 206 and PKS 0707-35)
• The Galactic Bulge Diffuse Emission in Broad-Band X-rays with NuSTAR
• Exploiting synergies between JWST and cosmic 21-cm observations to uncover star formation in the early Universe
• Suzaku Observation of the Brightest Broad-Line Radio Galaxy 4C 50.55 (IGR J 21247+5058)
• A Suzaku observation of the ULIRG IRAS19254-7245: disclosing the AGN component
• Relaxion Dark Matter
• A Joint Model of the X-ray And Infrared Extragalactic Backgrounds: I. Model Construction And First Results
• A high spectral resolution map of the nuclear emitting regions of NGC 7582
• Monte-Carlo simulations of the background of the coded-mask camera for X- and Gamma-rays on-board the Chinese-French GRB mission SVOM
• Suzaku and SWIFT-BAT observations of a newly discovered Compton-thick AGN
• Investigating signatures of cosmological time dilation in duration measures of prompt gamma-ray burst light curves
• Primordial Black Hole Dark Matter in the Context of Extra Dimensions
• Suzaku Results on the Obscured Low-Luminosity Active Galactic Nucleus in NGC 4258
• A Suzaku X-Ray Study of the Particle Acceleration Processes in the Relativistic Jet of Blazar Mrk 421
• Mildly obscured active galaxies and the cosmic X-ray background
• A method to localize gamma-ray bursts using POLAR
• The Accreting Black Hole Swift J1753.5-0127 from Radio to Hard X-Ray
• A thin diffuse component of the Galactic Ridge X-ray emission and heating of the interstellar medium contributed by the radiation of Galactic X-ray binaries
• Observational evidence favors a static universe
• Strong limits on keV-scale galactic sterile neutrino dark matter with stray light from NuSTAR after 11 years of operation
• Gamma-ray and Neutrino Signals from Accretion Disk Coronae of Active Galactic Nuclei
• Probing Nuclear and Circumnuclear Properties of NGC 6300 using X-ray Observations
• The longest observation of a low intensity state from a Supergiant Fast X-ray Transient: Suzaku observes IGRJ08408-4503
• Phenomenology of CP-even ALP
• Suzaku observation of IRAS 00521-7054, a peculiar type-II AGN with a very broad feature at 6 keV
• Future Constraints on Primordial Black Holes from XGIS-THESEUS
• Mergers of Maximally Charged Primordial Black Holes
• Temperature and Entropy Profiles to the Virial Radius of Abell 1246 Cluster Observed with Suzaku
• Instruments of RT-2 Experiment onboard CORONAS-PHOTON and their test and evaluation IV: Background Simulations using GEANT-4 Toolkit
• Statistical challenges in the search for dark matter
• Suzaku Discovery of a Slowly Varying Hard X-ray Continuum from the Type I Seyfert Galaxy NGC 3516
• 15 years of Galactic surveys and hard X-ray Background measurements
• Constraints on late-forming exploding black holes
• A Joint Model Of X-ray And Infrared Backgrounds. II. Compton-Thick AGN Abundance
• Revealing a hard X-ray spectral component that reverberates within one light hour of the central supermassive black hole in Ark 564
• Mass spectrum of primordial black holes from inflationary perturbation in the Randall-Sundrum braneworld: a limit on blue spectra
• Enhanced n-body annihilation of dark matter and its indirect signatures
• Hard X-ray/Soft gamma-ray experiments and missions: overview and prospects
• Unveiling the Fermi Bubbles origin with MeV photon telescopes
• Boosting small-scale structure via primordial black holes and implications for sub-GeV dark matter annihilation
• Spectral evolution of GRB 060904A observed with Swift and Suzaku -- Possibility of Inefficient Electron Acceleration
• VLT near-infrared spectra of hard serendipitous Chandra sources
• Cosmological Evolution of Flat-Spectrum Radio Quasars based on the {\it Swift}/BAT 105-month Catalog and Their Contribution to the Cosmic MeV Gamma-ray Background Radiation
• Higgs sector extension of the neutrino minimal standard model with thermal freeze-in production mechanism
• Primordial regular black holes as all the dark matter. III. Covariant canonical quantum gravity models
• Supermodel Analysis of the Hard X-Ray Excess in the Coma Cluster
• Reionization effect enhancement due to primordial black holes
• Significant X-ray Line Emission in the 5-6 keV band of NGC 4051
• Hard X-ray irradiation of cosmic silicate analogs: structural evolution and astrophysical implications
• Decaying fermionic warm dark matter and XENON1T electronic recoil excess
• Shining ALP Dark Radiation
• Measuring the Cosmic X-ray Background in 3-20keV with Straylight from NuSTAR
• Decrease in the Brightness of the Cosmic X-ray and Soft Gamma-ray Background toward Clusters of Galaxies
• Hard X-ray properties of radio-selected blazars
• Broad-Band High-Energy Emission of the Gamma-ray Binary System LS 5039: Spectral and Temporal Features using NuSTAR and Fermi Observations
• Estimation of the detected background by the future gamma-ray transient mission CAMELOT
• The Iron K Line Profile of IRAS 18325-5926
• INTEGRAL constraints on the Galactic hard X-ray background from the Milky Way anticenter
• Modeling the in-orbit background of PolarLight
• Simulations of the SVOM/ECLAIRs Dynamic Background: A fast, accurate and general approach for wide-field hard X-ray instruments
• The FIMP-WIMP dark matter in the extended singlet scalar model
• A decaying neutralino as dark matter and its gamma ray spectrum
• Constraining gravitational-wave backgrounds from conversions into photons in the Galactic magnetic field
• Resonant Assisted Annihilation
• Suzaku Observations of Extreme MeV Blazar SWIFT J0746.3+2548
• Modeling the Vertical Structure of Nuclear Starburst Discs: A Possible Source of AGN Obscuration at $z\sim 1$
• The variable ionized absorber in the Seyfert 2 Mrk 348
• Cluster contribution to the X-ray background as a cosmological probe
• Cosmological constraints on spontaneous R-symmetry breaking models
• Effects of capillary reflection in the performance of the collimator of the Large Area Detector on board LOFT
• Instrumental and scientific simulations of the LOFT Wide Field Monitor
• The Shape of the Cosmic X-ray Background: Nuclear Starburst Discs and the Redshift Evolution of AGN Obscuration
• About the measurements of the hard X-ray background
• Diffuse X-Ray and Gamma-Ray Limits on Boson Stars that Interact with Nuclei
• Multi-wavelength properties of changing-state active galactic nuclei: I. the evolution of soft excess and X-ray continuum
• In-orbit background simulation of a type-B CATCH satellite
• Measurements of the Soft Gamma-ray Emission from SN2014J with Suzaku
• Extragalactic Gamma-ray Background Radiation from Beamed and Unbeamed Active Galactic Nuclei
• In-orbit background for X-ray detectors
• Machine Learning-Based Analytical Expressions for Gray-Body Factors and Application to Primordial Black Holes
• Influence of the Earth on the background and the sensitivity of the GRM and ECLAIRs instruments aboard the Chinese-French mission SVOM
• LECX: a cubesat experiment to detect and localize cosmic explosions in hard X rays
• Background and Imaging Simulations for the Hard X-Ray Camera of the MIRAX Mission
• Measuring the Cosmic X-ray Background accurately
• Variation of the baryon-to-photon ratio due to decay of dark matter particles
• A Simulation Study for the Expected Performance of Sharjah-Sat-1 payload improved X-Ray Detector (iXRD) in the Orbital Background Radiation
• Monte Carlo Study of Detector Concepts for the MAX Laue Lens Gamma-Ray Telescope
• Exploring the MeV Sky with a Combined Coded Mask and Compton Telescope: The Galactic Explorer with a Coded Aperture Mask Compton Telescope (GECCO)
• Narrowing the discovery space of the cosmological 21-cm signal using multi-wavelength constraints
• Primordial black holes in Randall-Sundrum: Cosmological signatures
• Modeling the flaring activity of the high z, hard X-ray selected blazar IGR J22517+2217
• A multifrequency characterization of the extragalactic hard X-ray sky
• Improving the low-energy transient sensitivity of AMEGO-X using single-site events
• A model of light pseudoscalar dark matter
• Insight-HXMT Measurements of the Diffuse X-ray Background
• Self-consistent population synthesis of AGN from observational constraints in the X-rays
• Search for a photon peak from keV-scale dark matter annihilation with NuSTAR: Constraints on $⟨\sigma v⟩$ after 11 years of observations
• Energetic electron enhancements below the radiation belt and X-ray contamination at low-orbiting satellites
• SRG/ART-XC all-sky X-ray survey: Catalog of sources detected during the first year
• Limits on primordial black holes detectability with Isatis: A BlackHawk tool
• Exploration about the origin of galactic and extragalactic star clusters through simulated H-R diagrams
• Dark Matter Energy Deposition and Production from the Table-Top to the Cosmos
• The XGIS instrument on-board THESEUS: Monte Carlo simulations for response, background, and sensitivity
• CubeSats Reach the Millisecond X-Ray Domain: Crab Pulsar Timing with SpIRIT/HERMES
• The HaloSat and PolarLight CubeSat Missions for X-ray Astrophysics