SIMBAD references

2014MNRAS.442.2580P - Mon. Not. R. Astron. Soc., 442, 2580-2585 (2014/August-2)

Constraints on the space density of intermediate polars from the Swift-BAT survey.


Abstract (from CDS):

We construct a complete, hard X-ray flux-limited sample of intermediate polars (IPs) from the Swift-BAT 70-month survey, by imposing selection cuts in flux and Galactic latitude (FX > 2.5x10^- 11^erg/cm2/s at 14-195 keV, and {verbar}b{verbar} > 5°). We then use it to estimate the space density (ρ) of IPs. Assuming that this sample of 15 long-period systems is representative of the intrinsic IP population, the space density of long-period IPs is 1^+1_-0.5 ×10^-7 pc^-3. The Swift-BAT data also allow us to place upper limits on the size of a hypothetical population of faint IPs that is not included in the flux-limited sample. While most IPs detected by Swift-BAT have 14-195 keV luminosities of ∼ 1033erg/s, there is evidence of a fainter population at LX ∼ 1031erg/s. We find that a population of IPs with this luminosity may have a space density as large as 5x10–6/pc3. Furthermore, these low-luminosity IPs, despite appearing rare in observed samples, are probably at least as intrinsically common as the brighter systems that are better represented in the known IP sample.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): methods: observational - methods: statistical - novae, cataclysmic variables - X-rays: binaries

Simbad objects: 37

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