Deriving an X-ray luminosity function of dwarf novae based on parallax measurements
Abstract
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 ~1030-1031 erg s-1, 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 x 1030 erg s-1 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 x 1032 erg s-1 over the luminosity range of 1 x 1028 erg s-1 and the maximum luminosity of the sample (1.50 x 1032 erg s-1). The total absolute lower limit for the normalised luminosity per solar mass is 1.81 x 1026 erg s-1 M-1solar which accounts for ~16 per cent of the total X-ray emissivity of CVs as estimated by Sazonov et al. (2006).
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