Universal X-ray emissivity of the stellar population in early-type galaxies: unresolved X-ray sources in NGC 3379

被引：66
作者：
Revnivtsev, M. [1 ,2 ]
Churazov, E. [1 ,2 ]
Sazonov, S. [1 ,2 ]
Forman, W. [3 ]
Jones, C. [3 ]
机构：
[1] Max Planck Inst Astrophys, D-85740 Garching, Germany
[2] Russian Acad Sci, Inst Space Res, Moscow 117997, Russia
[3] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
来源：
ASTRONOMY & ASTROPHYSICS | 2008年 / 490卷 / 01期
基金：
美国国家航空航天局;
关键词：
galaxies: bulges; X-rays: binaries; X-rays: galaxies; X-rays: ISM; galaxies: fundamental parameters;
D O I：
10.1051/0004-6361:200809889
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We use deep Chandra observations to measure the emissivity of the unresolved X-ray emission in the elliptical galaxy NGC 3379. After elimination of bright, low-mass X-ray binaries with luminosities greater than or similar to 10(36) erg s(-1), we find that the remaining unresolved X-ray emission is characterized by an emissivity per unit stellar mass L-x/M-* similar to 8.2 x 10(27) erg s(-1) M-1 circle dot in the 0.5-2 keV energy band. This value is in good agreement with those previosuly determined for the dwarf elliptical galaxy M 32, the bulge of the spiral galaxy M 31 and the Milky Way, as well as with the integrated X-ray emissivity of cataclysmic variables and coronally active binaries in the Solar neighborhood. This strongly suggests that i) the bulk of the unresolved X-ray emission in NGC 3379 is produced by its old stellar population; and ii) the old stellar populations in all galaxies can be characterized by a universal value of X-ray emissivity per unit stellar mass or per unit K band luminosity.
引用
收藏
页码：37 / 43
页数：7
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