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We investigate the dependence of the low-mass X-ray binary (LMXB) population in early-type galaxies on stellar age, by selecting 20 massive nearby early-type galaxies from the Chandra archive occupying a relatively narrow range of masses…

High Energy Astrophysical Phenomena · Physics 2015-06-04 Zhongli Zhang , Marat Gilfanov , Akos Bogdan

We continue exploring our understanding of the collective properties of X-ray binaries in the stellar fields (i.e., outside globular clusters) of normal galaxies, introduced in Paper I of this series, where we considered high-mass X-ray…

High Energy Astrophysical Phenomena · Physics 2015-06-12 Harshal Bhadkamkar , Pranab Ghosh

We present an analysis of the ultraluminous X-ray source (ULX) population in 75 Virgo cluster late-type galaxies, including all those with a star formation rate >~ 1 M_{sun}/yr and a representative sample of the less star-forming ones. This…

We present the first X-ray Luminosity Function (XLF) for an optically-selected sample of 49 nearby poor clusters of galaxies and a sample of 67 Abell clusters with z < 0.15. We have extended the measured cluster XLF by more than a factor of…

Among high-redshift galaxies, aside from active galactic nuclei (AGNs), X-ray binaries (XRBs) can be significant sources of X-ray emission. XRBs play a crucial role in galaxy evolution, reflecting the stellar populations of galaxies and…

Astrophysics of Galaxies · Physics 2025-08-01 Sijia Cai , Zheng Cai , Jianwei Lyu , Yunjing Wu , Xiaojing Lin , Mingyu Li , Junjie Mao , Jiayi Chen , Pengjun Lu

We use the measured X-ray luminosity function (XLF) of high-mass X-ray binaries (HMXBs) in nearby star-forming galaxies to constrain the common envelope (CE) mechanisms, which play a key role in governing the binary evolution. We find that…

High Energy Astrophysical Phenomena · Physics 2014-11-26 Zhao-Yu Zuo , Xiang-Dong Li

Large area catalogs of galaxy clusters constructed from ROSAT All Sky Survey provide the base for our knowledge on the population of clusters thanks to the long-term multiwavelength efforts on their follow-up. Advent of large area…

We present the X-ray luminosity function (XLF) of the ROSAT Brightest Cluster Sample (BCS), an X-ray selected, flux limited sample of 172 clusters of galaxies at $z\leq 0.3$ compiled from ROSAT All-Sky Survey data. While the bulk of the BCS…

We have studied the X-ray luminosity function (XLF) of low-mass X-ray binaries (LMXBs) in the nearby lenticular galaxy NGC 3115, using the Megasecond Chandra X-Ray Visionary Project Observation. With a total exposure time of ~1.1 Ms, we…

The population of low-luminosity (< 10^35 erg/s) X-Ray Binaries (XRBs) has been investigated in our Galaxy and M31 but not further. To address this problem, we have used data from the Chandra X-Ray Observatory and the Hubble Space Telescope…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-12 N. Vulic , P. Barmby , S. C. Gallagher

Observations of the high energy sky, mainly with the INTEGRAL satellite, have raised new questions about the formation and evolution of High Mass X-ray Binaries (HMXBs). The number of detected HMXBs of different types is now high enough to…

High Energy Astrophysical Phenomena · Physics 2013-02-18 A. Coleiro , S. Chaty

We aim to characterize the nature of galaxies whose optical emission line diagnostics are consistent with star formation, but whose X-ray properties strongly point towards the presence of an AGN. Understanding these sources is of particular…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-05 N. Castelló-Mor , X. Barcons , L. Ballo , F. J. Carrera , M. J. Ward , C. Jin

We investigate claims that recent deep X-ray surveys are detecting starbursts at cosmologically interesting redshifts (z=0-1). We combine X-ray data from the 2Ms CDF-North with multi-wavelength observations from GOODS to build the SEDs (UV,…

Astrophysics · Physics 2008-11-26 A. Georgakakis , M. Rowan-Robinson , T. S. R. Babbedge , I. Georgantopoulos

X-ray luminosity functions (XLFs) of Active Galactic Nuclei (AGN) trace the growth and evolution of supermassive black hole populations across cosmic time, however, current XLF models are poorly constrained at redshifts of z>6, with a lack…

High Energy Astrophysical Phenomena · Physics 2023-01-25 Cassandra L. Barlow-Hall , Jack Delaney , James Aird , Philip A. Evans , Julian P. Osborne , Michael G. Watson

Accurate synthetic models of stellar populations are constructed and used in evolutionary models of stellar populations in forming galaxies. Following their formation, the late type galaxies are assumed to follow the Schmidt law for star…

Astrophysics · Physics 2009-10-30 R. Jimenez , A. Kashlinsky

Observations of the high energy sky, particularly with the INTEGRAL satellite, have quadrupled the number of supergiant X-ray Binaries observed in the Galaxy, and revealed new populations of previously hidden High Mass X-ray Binaries…

High Energy Astrophysical Phenomena · Physics 2013-02-08 Alexis Coleiro , Sylvain Chaty

The fraction of galaxies bound in groups in the nearby Universe is high (50% at z~0). Systematic studies of galaxy properties in groups are important in order to improve our understanding of the evolution of galaxies and of the physical…

Self-lensing (SL) in binary systems has the potential to provide a unique observational window into the Galactic population of compact objects. Using the $\mathtt{startrack}$ and COSMIC population synthesis codes, we investigate how…

High Energy Astrophysical Phenomena · Physics 2026-02-18 Grzegorz Wiktorowicz , Matthew Middleton , Aleksandra Olejak , Cordelia Dashwood-Brown , Madeleine-Mai Ward , Adam Ingram

Understanding the star formation rate (SFR) variability and how it depends on physical properties of galaxies is important for developing and testing the theory of galaxy formation. We investigate how statistical measurements of the…

Astrophysics of Galaxies · Physics 2023-07-12 Guochao Sun , Adam Lidz , Andreas L. Faisst , Claude-André Faucher-Giguère

We present an observationally motivated model to connect the AGN and galaxy populations at 0.2<z<1.0 and predict the AGN X-ray luminosity function (XLF). We start with measurements of the stellar mass function of galaxies (from the Prism…

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