2005ApJ...625...89K


Query : 2005ApJ...625...89K

2005ApJ...625...89K - Astrophys. J., 625, 89-94 (2005/May-3)

Extragalactic source counts in the 20-50 keV energy band from the deep observation of the Coma region by INTEGRAL IBIS.

KRIVONOS R., VIKHLININ A., CHURAZOV E., LUTOVINOV A., MOLKOV S. and SUNYAEV R.

Abstract (from CDS):

We present the analysis of serendipitous sources in a deep, 500 ks, hard X-ray observation of the Coma Cluster region with the IBIS instrument on board INTEGRAL. In addition to the Coma Cluster, the final 20-50 keV image contains 12 serendipitous sources with statistical significance >4 σ. We use these data (after correcting for expected number of false detections) to extend the extragalactic source counts in the 20-50 keV energy band down to a limiting flux of 1.0x10–11 ergs/s/cm2 (≃1 mcrab). This is a more than a factor of 10 improvement in sensitivity compared to the previous results in this energy band obtained with the HEAO 1 A-4 instrument. The derived source counts are consistent with the Euclidean relation N(>f)∝f–3/2. A large fraction of identified serendipitous sources are low-redshift, z<0.02, active galactic nuclei (AGNs), mostly of Seyfert 1 type. The surface density of hard X-ray sources is (1.4±0.5)x10–2 deg–2 above a flux threshold of 10–11 ergs/s/cm2. These sources directly account for ∼3% of the cosmic X-ray background in the 20-50 keV energy band. Given the low redshift depth of our sample, we expect that similar sources at higher redshifts account for a significant fraction of the hard X-ray background. Our field covers only 3% of the sky; a systematic analysis of other extragalactic INTEGRAL observations can produce much larger source samples and is, therefore, critically important.

Abstract Copyright:

Journal keyword(s): Galaxies: Active - Galaxies: Seyfert - X-Rays: Diffuse Background - X-Rays: General

Nomenclature: Table 1: [KVC2005] NN (Nos 1-13).

Simbad objects: 15

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Number of rows : 15
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 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5090 0
2 M 1 SNR 05 34 32 +22 00.8           ~ 5975 1
3 [KVC2005] 5 X 11 56 47 +37 00.3           ~ 1 0
4 NGC 4151 Sy1 12 10 32.5759813872 +39 24 21.063527532   12.18 11.48     ~ 3553 2
5 NGC 4253 Sy1 12 18 26.5163572920 +29 48 46.531535472   14.34 13.57     ~ 1001 1
6 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1282 2
7 NGC 4395 Sy2 12 25 48.8633109888 +33 32 48.700168152 10.84 10.54 10.11 9.98   ~ 1099 1
8 [KVC2005] 4 X 12 31 19 +12 14.0           ~ 1 0
9 [KVC2005] 13 X 12 48 49 +33 15.2           ~ 1 0
10 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4572 2
11 [KVC2005] 12 X 13 10 18 +20 01.8           ~ 1 0
12 NGC 5033 Sy1 13 13 27.535 +36 35 37.14   11.01 12.03 9.73   ~ 836 3
13 V* BH CVn RS* 13 34 47.8087660104 +37 10 56.691826860 5.43 5.38 4.98 4.57 4.27 A6m 329 0
14 [KVC2005] 6 X 13 37 09 +15 20.0           ~ 1 0
15 NGC 5548 Sy1 14 17 59.5400291832 +25 08 12.603122268   14.35 13.73     ~ 2575 0

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2022.11.30-13:10:10

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