Properties of the Galactic population of cataclysmic variables in hard X-rays

被引：55
作者：
Revnivtsev, M. [1 ,2 ,3 ]
Sazonov, S. [1 ,2 ]
Krivonos, R. [1 ,2 ]
Ritter, H. [1 ]
Sunyaev, R. [1 ,2 ]
机构：
[1] Max Planck Inst Astrophys, D-85740 Garching, Germany
[2] Russian Acad Sci, Space Res Inst, Moscow 117997, Russia
[3] Tech Univ Munich, D-8046 Garching, Germany
来源：
ASTRONOMY & ASTROPHYSICS | 2008年 / 489卷 / 03期
关键词：
stars : binaries : close; stars : binaries : general; stars; novae; cataclysmic variables; stars : luminosity function; mass function; stars : white dwarfs; X-rays : binaries;
D O I：
10.1051/0004-6361:200810213
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We measure the spatial distribution and hard X-ray luminosity function of cataclysmic variables (CVs) using the INTEGRAL all-sky survey in the 17-60 keV energy band. The vast majority of CVs detected by INTEGRAL are intermediate polars of luminosity in the range 10(32)-10(34) erg s(-1). The scale height of the Galactic disk population of intermediate polars is found to be 130(-46)(+93) pc. The CV luminosity function measured with INTEGRAL in hard X-rays is compatible with that previously determined at lower energies (3-20 keV) using a largely independent sample of sources detected by RXTE (located at vertical bar b vertical bar > 10 degrees as opposed to the INTEGRAL sample, which is strongly concentrated to the Galactic plane). The cumulative 17-60 keV luminosity density of CVs per unit stellar mass is found to be (1.3 +/- 0.3) x 10(27) erg s(-1) M-circle dot(-1), which is comparable to that of low-mass X-ray binaries in this energy band. Therefore, faint but numerous CVs are expected to provide an important contribution to the cumulative hard X-ray emission of galaxies.
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收藏
页码：1121 / 1127
页数：7
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