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Deriving an X-ray luminosity function of dwarf novae based on parallax measurements

Monthly Notices of the Royal Astronomical Society, ISSN: 1365-2966, Vol: 408, Issue: 4, Page: 2298-2311
2010
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Article Description

We have derived an X-ray luminosity function using parallax-based distance measurements of a set of 12 dwarf novae, consisting of Suzaku, XMM-Newton and ASCA observations. The shape of the X-ray luminosity function obtained is the most accurate to date, and the luminosities of our sample are concentrated between ~10 and 10erg s, lower than previous measurements of X-ray luminosity functions of dwarf novae. Based on the integrated X-ray luminosity function, the sample becomes more incomplete below ~3 × 10erg s than it is above this luminosity limit, and the sample is dominated by X-ray bright dwarf novae. The total integrated luminosity within a radius of 200 pc is 1.48 × 10erg s over the luminosity range of 1 × 10erg s and the maximum luminosity of the sample (1.50 × 10erg s). The total absolute lower limit for the normalized luminosity per solar mass is 1.81 × 10erg s M which accounts for ~16 per cent of the total X-ray emissivity of cataclysmic variables as estimated by Sazonov et al. © 2010 The Authors. Journal compilation © 2010 RAS.

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