SIMBAD references

2022MNRAS.511.4937S - Mon. Not. R. Astron. Soc., 511, 4937-4945 (2022/April-3)

Hard X-ray luminosity functions of cataclysmic variables: joint Swift/BAT and Gaia data.


Abstract (from CDS):

Cataclysmic variables (CVs) are the most numerous population among the Galactic objects emitting in hard X-rays. Most probably, they are responsible for the extended hard X-ray emission of the Galactic ridge and the central Galactic regions. Here, we consider the sample of CVs detected in the all-sky hard X-ray Swift/BAT survey, which were also detected by Gaia and thus have reliable distance estimates. Using these data, we derive accurate estimates for local number density per solar mass (ρM = 1.37+0.3–0.16. ×10–5 M–1) and luminosity density per solar mass (ρL = 8.95+0.15–0.1×1026 erg s–1 M–1) for objects in the sample. These values appear to be in good agreement with the integrated Galactic ridge X-ray emission and nuclear stellar cluster luminosities. Analysis of the differential luminosity functions dρM/d(log10Lx) and dρL/d(log10Lx) confirms that there are two populations of hard X-ray-emitting CVs. Intermediate polars dominate at luminosities L > 1033 erg s–1, whereas non-magnetic CVs and polars are much more numerous but have lower luminosities on average. As a consequence, the contribution of these populations to the observed hard X-ray luminosity is almost equivalent.

Abstract Copyright: © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - methods: statistical - stars: novae, cataclysmic variables - X-rays: binaries - X-rays: diffuse background

Simbad objects: 93

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