2006A&A...452..169R


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.04CEST22:53:03

2006A&A...452..169R - Astronomy and Astrophysics, volume 452, 169-178 (2006/6-2)

Origin of the Galactic ridge X-ray emission.

REVNIVTSEV M., SAZONOV S., GILFANOV M., CHURAZOV E. and SUNYAEV R.

Abstract (from CDS):

We analyze a map of the Galactic ridge X-ray emission (GRXE) constructed in the 3-20keV energy band from RXTE/PCA scan and slew observations. We show that the GRXE intensity follows the Galactic near-infrared surface brightness closely and thus traces the Galactic stellar mass distribution. The GRXE consists of two spatial components that can be identified with the bulge/bar and the disk of the Galaxy. The parameters of these components determined from X-ray data are compatible with those derived from near-infrared data. The inferred ratio of X-ray to near-infrared surface brightness I3–20keV(10–11erg/s/cm2/deg2)/I3.5µm(MJy/sr)=0.26±0.05, and the ratio of X-ray to near-infrared luminosity L3–20keV/L3–4µm=(4.1±0.3)x10–5. The corresponding ratio of the 3-20keV luminosity to the stellar mass is Lx/M=(3.5±0.5)x1027erg/s/M, which agrees within the uncertainties with the cumulative emissivity per unit stellar mass of point X-ray sources in the Solar neighborhood, determined in an accompanying paper (Sazonov et al., 2006A&A...450..117S). This suggests that the bulk of the GRXE is composed of weak X-ray sources, mostly cataclysmic variables and coronally active binaries. The fractional contributions of these classes of sources to the total X-ray emissivity determined from the Solar neighborhood data can also explain the GRXE energy spectrum. Based on the luminosity function of local X-ray sources we predict that, in order to resolve 90% of the GRXE into discrete sources, a sensitivity limit of ∼10–16erg/s/cm2 (2-10keV) will need to be reached in future observations.

Abstract Copyright:

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

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 22468 RS* 03 36 47.2911034958 +00 35 15.938962144 7.09 6.63   5.4   K2:Vnk 1124 0
2 V* SU UMa DN* 08 12 28.2694633475 +62 36 22.428029272           B2 469 0
3 V* RS CVn Al* 13 10 36.9078781154 +35 56 05.587686902 8.57 8.51 7.93 7.7   F6IV+G8IV 684 0
4 [KRL2007b] 270 gam 17 45 38.5 -29 01 15           ~ 25 0
5 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3473 3
6 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11605 0
7 V* AM Her AM* 18 16 13.2546541781 +49 52 04.759861155     12.30     M4.5 911 0
8 V* V1223 Sgr DQ* 18 55 02.3109253503 -31 09 49.589704079           ~ 302 0
9 4C 50.55 Sy1 21 24 39.4 +50 58 25           ~ 84 1
10 NAME Galactic Ridge ? ~ ~           ~ 429 1
11 NAME Galactic Bulge reg ~ ~           ~ 3410 0

    Equat.    Gal    SGal    Ecl

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2020.08.04-22:53:03

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