C.D.S. - SIMBAD4 rel 1.7 - 2020.02.22CET18:08:04

2007A&A...473..857R - Astronomy and Astrophysics, volume 473, 857-862 (2007/10-3)

Resolving the Galactic ridge X-ray background.


Abstract (from CDS):

We use Chandra deep observations of the Galactic Center (GC) region to improve the constraints on the unresolved fraction of the Galactic ridge X-ray background in the 4-8 keV band. We emphasize the importance of correcting the measured source counts at low fluxes for bias associated with Poisson noise. We find that at distances of 2'-4' from Sgr A* at least ∼40% of the total X-ray emission in the energy band 4-8 keV originates from point sources with luminosities L_2-10 keV_>1031erg/s. From a comparison of the source number-flux function in the GC region with the known luminosity function of faint X-ray sources in the Solar vicinity, we infer that Chandra has already resolved a large fraction of the cumulative contribution of cataclysmic variables to the total X-ray flux from the GC region. This comparison further indicates that most of the yet unresolved X-ray flux from the GC region (∼60%) is likely produced by weak cataclysmic variables and coronally active stars with L2–10keV<1031erg/s. We conclude that the bulk of the high energy Galactic X-ray background in this direction is produced by discrete sources, and that this is likely to be the case for the rest of the Galactic ridge.

Abstract Copyright:

Journal keyword(s): stars: binaries: general - X-rays: binaries - X-rays: general - X-rays: stars - Galaxy: center

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3346 3
2 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11251 0
3 NAME Galactic Ridge ? ~ ~           ~ 416 1

    Equat.    Gal    SGal    Ecl

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