X-Ray Binaries in External Galaxies

Gilfanov, M.; Fabbiano, G.; Lehmer, Bret; Zezas, A.

doi:10.1007/978-981-16-4544-0_108-1

Cited by 5 publications

(1 citation statement)

References 157 publications

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“…For the last >20 years, Chandra and XMM-Newton, in conjunction with several multiwavelength facilities, have enabled many investigations of the roles of X-ray emitting phenomena in galaxy populations that span a broad range of properties (e.g., from starburst to passive ellipticals; see Gilfanov et al, 2022;Nardini et al, 2022, for recent reviews).…”

Section: Introductionmentioning

confidence: 99%

The high energy X-ray probe: resolved X-ray populations in extragalactic environments

Lehmer,

Garofali,

Binder

et al. 2023

Front. Astron. Space Sci.

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We construct simulated galaxy data sets based on the High Energy X-ray Probe (HEX-P) mission concept to demonstrate the significant advances in galaxy science that will be yielded by the HEX-P observatory. The combination of high spatial resolution imaging (<20 arcsec FWHM), broad spectral coverage (0.2–80 keV), and sensitivity superior to current facilities (e.g., XMM-Newton and NuSTAR) will enable HEX-P to detect hard (4–25 keV) X-ray emission from resolved point-source populations within ∼800 galaxies and integrated emission from ∼6,000 galaxies out to 100 Mpc. These galaxies cover wide ranges of galaxy types (e.g., normal, starburst, and passive galaxies) and properties (e.g., metallicities and star-formation histories). In such galaxies, HEX-P will: 1) provide unique information about X-ray binary populations, including accretor demographics (black hole and neutron stars), distributions of accretion states and state transition cadences; 2) place order-of-magnitude more stringent constraints on inverse Compton emission associated with particle acceleration in starburst environments; and 3) put into clear context the contributions from X-ray emitting populations to both ionizing the surrounding interstellar medium in low-metallicity galaxies and heating the intergalactic medium in the z > 8 Universe.

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Section: Introductionmentioning

confidence: 99%

The high energy X-ray probe: resolved X-ray populations in extragalactic environments

Lehmer,

Garofali,

Binder

et al. 2023

Front. Astron. Space Sci.

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The X-ray point source population hosted by globular clusters in the elliptical galaxy NGC 4261

Nair

Dage

Haggard

et al. 2023

Monthly Notices of the Royal Astronomical Society

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Utilising archival Chandra X-ray Observatory data and Hubble Space Telescope globular cluster catalogues, we probe the time-domain properties of the low mass X-ray binary population in the elliptical galaxy NGC 4261. Of the 98 unique X-ray sources identified in this study, 62 sources are within the optical field of view and, of those, 33% are aligned with an optical cluster counterpart. We find twenty X-ray sources coincident with globular clusters; two are previously discovered ultra-luminous X-ray sources (ULXs) and eighteen are low mass X-ray binaries (GCLMXBs) with LX < 1039 erg s−1. ULXs are a heterogeneous class of extremely bright X-ray binaries (LX > 1039 erg s−1) and ULXs located in globular clusters (GCULXs) and may be indicators of black holes. Identifying these unusually X-ray bright sources and measuring their optical properties can provide valuable constraints on the progenitors of gravitational wave sources. We compare observations of these sources to the twenty previously-studied GCULXs from five other early-type galaxies, and find that GCULXs in NGC 4261 are of similar colour and luminosity and do not significantly deviate from the rest of the sample in terms of distance from the galaxy centre or X-ray luminosity. Both the GCULX and low mass X-ray binary (GCLMXB) populations of NGC 4261 show long term variability; the former may have implications for fast radio bursts originating in globular clusters and the latter will likely introduce additional scatter into the low mass end of GCLMXB X-ray luminosity functions.

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SRG/eROSITA catalogue of X-ray active SDSS dwarf galaxies

Bykov,

Gilfanov,

Sunyaev

2023

Monthly Notices of the Royal Astronomical Society

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We present a sample of 99 dwarf galaxies (M* < 109.5 M⊙) with X-ray activity in their central regions. The sample was obtained from a match of the SRG/eROSITA X-ray catalogue in the eastern galactic hemisphere with the MPA-JHU SDSS catalogue. The obtained matches were cleaned rigorously with the help of external optical catalogues to increase the purity of the sample. This work is the largest study of this kind – X-ray activity in ≈85 per cent of matched dwarfs was not reported before. The majority of X-ray active dwarfs are identified as star-forming galaxies. However, the X-ray luminosity of 82 objects cannot be explained by the collective emission of X-ray binaries, rendering them strong candidates for dwarf galaxies with an active accreting black hole in their centre. We find that the fraction of AGN among dwarf galaxies drops from ∼2 · 10−2 at LX ∼ 1039 erg s–1 to ∼(2 − 4) · 10−4 at LX ∼ 1041 erg s–1 and increases with the stellar mass of the host galaxy. We serendipitously discovered sources with unexpected properties. We report on a tidal disruption event (TDE) candidate in a dwarf galaxy, a massive black hole in a dwarf galaxy with a soft thermal spectrum, a luminous dwarf galaxy with an obscured X-ray spectrum and a few other peculiar sources. We found three Ultra-luminous X-ray (ULX) source candidates and a sample of X-ray bright galaxy pairs, in four of which both members shine in X-rays.

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X-Ray Binaries in External Galaxies

Cited by 5 publications

References 157 publications

The high energy X-ray probe: resolved X-ray populations in extragalactic environments

The high energy X-ray probe: resolved X-ray populations in extragalactic environments

The X-ray point source population hosted by globular clusters in the elliptical galaxy NGC 4261

SRG/eROSITA catalogue of X-ray active SDSS dwarf galaxies

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