2008A&A...487..509S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.02CEST14:28:48

2008A&A...487..509S - Astronomy and Astrophysics, volume 487, 509-517 (2008/8-4)

Discovery of heavily-obscured AGN among seven INTEGRAL hard X-ray sources observed by Chandra.

SAZONOV S., REVNIVTSEV M., BURENIN R., CHURAZOV E., SUNYAEV R., FORMAN W.R. and MURRAY S.S.

Abstract (from CDS):

We identify hard X-ray sources discovered by the INTEGRAL all-sky survey. We complete identification of a unique sample of active galactic nuclei (AGN) selected in the hard X-ray band (17-60keV) with minimal effects from absorption. Subsequently, we determine the fraction of obscured AGN in the local Universe. We observed 7 INTEGRAL sources with the Chandra X-ray Observatory to refine their localization to ∼2arcsec and to study their X-ray spectra. Two sources are inferred to have a Galactic origin: IGR J08390-4833 is most likely a magnetic cataclysmic variable with a white dwarf spin period ∼1450s; and IGR J21343+4738 is a high-mass X-ray binary. Five sources (IGR J02466-4222, IGR J09522-6231, IGR J14493-5534, IGR J14561-3738, and IGR J23523+5844) prove to be AGN with significant intrinsic X-ray absorption along the line of sight. Their redshifts and hard X-ray (17-60keV) luminosities range from 0.025 to 0.25 and from ∼2x1043 to ∼2x1045erg/s, respectively, with the distance to IGR J14493-5534 remaining unknown. The sources IGR J02466-4222 and IGR J14561-3738 are likely Compton-thick AGN with absorption column densities NH>1024/cm2, and the former further appears to be one of the nearest X-ray bright, optically-normal galaxies. With the newly-identified sources, the number of heavily-obscured (NH>1024/cm2) AGN detected by INTEGRAL has increased to ∼10. Therefore, such objects constitute 10-15% of hard X-ray bright, non-blazar AGN in the local Universe. The small ratio (≪1%) of soft (0.5-8.0keV) to hard (17-60keV) band fluxes (Chandra to INTEGRAL) and the non-detection of optical narrow-line emission in some of the Compton-thick AGN in our sample suggests that there is a new class of objects in which the central massive black hole may be surrounded by a geometrically-thick dusty torus with a narrow ionization cone.

Abstract Copyright:

Journal keyword(s): surveys - galaxies: Seyfert - novae, cataclysmic variables - X-rays: binaries

CDS comments: Fig.2 IGR J14561+3738 is a probable misprint for IGR J14561-3738.

Simbad objects: 18

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Number of rows : 18

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 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4089 2
2 MCG-07-06-018 AGN 02 46 37.007 -42 22 01.52   15.66       ~ 16 0
3 ACO S 296 ClG 02 46 51.5 -42 22 41           ~ 15 0
4 2MASS J08384911-4831248 CV* 08 38 49.1087130822 -48 31 24.816483698   17.6   16.1   ~ 18 0
5 SWIFT J0952.3-6234 Sy1 09 52 20.7 -62 32 37           ~ 26 0
6 XSS J12270-4859 LXB 12 27 58.7475950389 -48 53 42.826034125           ~ 205 0
7 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1264 2
8 NGC 4992 Sy2 13 09 05.597 +11 38 02.85   14.6       ~ 92 0
9 2MFGC 12018 AGN 14 49 12.836 -55 36 19.43           ~ 21 0
10 2MASS J14534105-5521387 CV* 14 53 41.0567066564 -55 21 38.719483656           ~ 31 0
11 NAME XSS J14562-37 Sy2 14 56 08.430 -37 38 52.41   13.56   12.32   ~ 31 2
12 XSS J14562-3735 X 14 56.3 -37 36           ~ 2 0
13 2MASS J15092601-6649232 DQ* 15 09 26.0167449792 -66 49 23.280117933           ~ 35 0
14 INTEGRAL1 19 CV* 16 16 37.7618836664 -49 58 44.567852659   17.4   16.2 14.5 ~ 36 0
15 1RXS J171935.6-410054 CV* 17 19 35.8926842186 -41 00 53.529161029   15.60 15.20 15.33 14.3 ~ 50 0
16 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11532 0
17 2MASS J21342037+4738002 HXB 21 34 20.3718012674 +47 38 00.206178882   14.68 14.16 13.80 13.42 ~ 15 0
18 2MASS J23522211+5845307 Sy2 23 52 22.1740391638 +58 45 30.858849468   19.7   18.5   ~ 23 0

    Equat.    Gal    SGal    Ecl

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2020.07.02-14:28:48

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