2012A&A...537A..92K


Query : 2012A&A...537A..92K

2012A&A...537A..92K - Astronomy and Astrophysics, volume 537A, 92-92 (2012/1-1)

INTEGRAL constraints on the Galactic hard X-ray background from the Milky Way anticenter.

KRIVONOS R., TSYGANKOV S., REVNIVTSEV M., SAZONOV S., CHURAZOV E. and SUNYAEV R.

Abstract (from CDS):

We present results of a study of the Galactic ridge X-ray emission (GRXE) in hard X-rays with the IBIS telescope onboard INTEGRAL in the region near the Galactic anticenter (GA) at l=155°. We assumed a conservative 2σ upper limit on the flux from the GA in the 25-60keV energy band of 1.25x10–10erg/s/cm2 (12.8mCrab) per IBIS field of view, or 6.6x10–12erg/s/cm2 (0.7mCrab) per degree longitude in the 135°<l<175° region. This upper limit exceeds the expected GRXE intensity in the GA direction by an order of magnitude, given the near-infrared (NIR) surface brightness of the Milky Way in this region and the standard hard X-ray-to-NIR intensity ratio for the GRXE, assuming stellar origin. Based on the CGRO/EGRET surface brightness of the Galaxy above 100MeV as a tracer of the cosmic-ray (CR) induced gamma-ray background, the expected GRXE flux in GA exceeds the measured 2σ upper limit by a factor of 4. Therefore, the non-detection of hard X-ray emission from the GA does not contradict the stellar nature of the GRXE, but is inconsistent with CR origin.

Abstract Copyright:

Journal keyword(s): Galaxy: structure - X-rays: diffuse background

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 IGR J01532+2612 gam 01 53 12.0 +26 12 00           ~ 1 0
2 NAME XMM-LSS Field reg 02 18 00 -07 00.0           ~ 219 0
3 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 2135 1
4 V* GK Per No* 03 31 12.0098863320 +43 54 15.469951212   14.139 13.090 12.589   K1IV 900 0
5 4C 32.14 QSO 03 36 30.1074972672 +32 18 29.341371132     17.50 16.6   ~ 615 1
6 V* X Per HXB 03 55 23.0777456088 +31 02 45.039836148 6.090 6.840 6.720     O9.5III 945 0
7 3C 111 Sy1 04 18 21.2772425736 +38 01 35.801359968   19.75 18.05     ~ 904 1
8 LS V +44 17 HXB 04 40 59.3296237272 +44 31 49.258049376 11.02 11.42 10.73 10.28 9.76 B0.2Ve 107 0
9 LEDA 168563 Sy1 04 52 04.7723618832 +49 32 44.750794344     17.1     ~ 61 0
10 M 1 SNR 05 34 32 +22 00.8           ~ 5973 1
11 NAME Gal Anticenter reg 05 46 +28.9           ~ 830 0
12 UGC 3374 Sy1 05 54 53.6080860768 +46 26 21.624853488   15.37 14.62     ~ 493 2
13 Mrk 3 Sy2 06 15 36.2812259376 +71 02 14.837219808 14.21 14.03 12.97     ~ 888 3
14 IGR J08135+5655 gam 08 13 30.0 +56 55 00           ~ 1 0
15 NAME M82 ULX-1 UX? 09 55 50.01 +69 40 46.0           ~ 262 1
16 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6355 0
17 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5613 1
18 M 87 AGN 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6779 3
19 3C 279 Bla 12 56 11.1663795384 -05 47 21.528432492   18.01 17.75 15.87   ~ 2906 2
20 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4570 2
21 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13304 0
22 NAME NEP reg 18 00 00.000 +66 33 38.55           ~ 313 0
23 NAME Galactic Ridge ? ~ ~           ~ 475 1

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2022.11.28-10:12:45

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