2008A&A...485..707P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST23:23:27

2008A&A...485..707P - Astronomy and Astrophysics, volume 485, 707-718 (2008/7-3)

A deep INTEGRAL hard X-ray survey of the 3C 273/Coma region.

PALTANI S., WALTER R., McHARDY I.M., DWELLY T., STEINER C. and COURVOISIER T.J.-L.

Abstract (from CDS):

We present an analysis of the deepest hard X-ray survey to date of about 2500deg2 performed by the IBIS instrument on board INTEGRAL in the 20-60keV band, with a total exposure time of 4Ms. We find 34 candidate sources, for which we try to find counterparts at other wavelengths. The ratio of Seyfert 1 to Seyfert 2 is significantly more than the ratio found in the optical. This effect may be explained in the framework of the receding-torus model, but could also be due to absorption columns large enough to affect the 20-60keV band. None of the predicted Compton-thick objects with 1024<NH<1025cm–2 is detected unambiguously; when taking lower limits on NH into account, the fraction of these objects is found to be lower than 24%. We do not see, but cannot exclude, a relationship between absorption and luminosity similar to what is seen in the 2-10keV band. Our data suggests the possibility of a lack of objects with 1021≤NH≤1022cm–2, which could be expected if absorption has two origins, for instance a torus-like structure and the host galaxy. We find that the LogN-LogS diagram of our sources is compatible with those obtained in other surveys in hard X-rays. Compared to models of the AGN population selected in the 2-10keV band, the LogN-LogS diagram is generally in good agreement, but the NH distribution is significantly different, with significantly less unabsorbed sources (NH<1022cm–2) at a given flux limit compared to the models. In this survey, we resolve about 2.5% of the cosmic X-ray background in the 20-60keV band. We also study the local hard X-ray luminosity function, which is compatible with what is found in other recent hard X-ray surveys. The characteristic luminosity Log L*20–60keV=43.66 is found to be a factor about 5 lower than the value observed in the 2-10keV band. We find a space density of 10–3 AGN with L20–60keV>1041 per Mpc3 and a corresponding luminosity density of 0.9x1039erg/s/Mpc3.

Abstract Copyright:

Journal keyword(s): surveys - galaxies: active - galaxies: seyfert - X-rays: diffuse background - X-rays: galaxies

Simbad objects: 37

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Number of rows : 37

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 2MASS J03123866-7651335 AGN 03 12 38.670 -76 51 33.53       18   ~ 19 0
2 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1812 1
3 2MASX J11222455-0416096 G 11 22 24.554 -04 16 09.64   17.5   16.027   ~ 4 0
4 2MASX J11424200+0852251 LIN 11 42 42.001 +08 52 25.14   15.3       ~ 17 0
5 2MASX J11454045-1827149 Sy1 11 45 40.4653921674 -18 27 14.962362659   14.63 14.29 10.5   ~ 126 0
6 Z 41-20 Sy2 12 00 57.932 +06 48 23.12   15.3       ~ 67 0
7 2MASX J12041248-0757206 G 12 04 12.4850694769 -07 57 20.684348470           ~ 3 0
8 2MASX J12055104+3819308 G 12 05 51.0291431590 +38 19 30.440721439   19.3   18.9   ~ 2 0
9 2MASX J12065497-1446335 G 12 06 54.979 -14 46 33.50   16.52   15.36   ~ 3 0
10 FIRST J120709.2+253826 rG 12 07 09.2160662113 +25 38 26.382256301   14.87       ~ 21 0
11 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3380 2
12 2MASS J12124981+0659451 Sy1 12 12 49.8380231990 +06 59 45.428459727   18.85 18.35 17.2   ~ 24 0
13 NGC 4180 AGN 12 13 03.054 +07 02 19.63   13.2       ~ 115 0
14 2MASX J12135456-0530193 Sy1 12 13 54.5888403138 -05 30 19.601074444     16.24     ~ 15 0
15 NGC 4235 Sy1 12 17 09.8844228368 +07 11 29.665090752   14.70 13.60     ~ 364 0
16 NVSS J121736-012951 Rad 12 17 35.90 -01 30 01.0           ~ 1 0
17 NGC 4253 Sy1 12 18 26.5155239433 +29 48 46.518670434   14.34 13.57     ~ 931 1
18 4C 04.42 QSO 12 22 22.54962080 +04 13 15.7761797   17.88 17.98 17.06   ~ 248 1
19 Mrk 50 Sy1 12 23 24.1368239628 +02 40 44.452269820   17.25 16.63     ~ 192 0
20 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1184 2
21 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5320 1
22 2MASS J12301552+0302546 Sy1 12 30 15.5222808235 +03 02 54.709538732   18.64 18.02     ~ 19 0
23 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6213 3
24 ESO 506-27 Sy2 12 38 54.5931097449 -27 18 27.998858037   14.59   12.87   ~ 79 0
25 2MASX J12390630-1610472 Sy2 12 39 06.2810518255 -16 10 47.227607708           ~ 74 0
26 NGC 4593 Sy1 12 39 39.4435521178 -05 20 39.035028119   13.95 13.15     ~ 950 0
27 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2704 2
28 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4208 2
29 NGC 4941 Sy2 13 04 13.1053484000 -05 33 05.754194531   13.18 12.23 10.74   ~ 304 0
30 NGC 4939 Sy2 13 04 14.3281622249 -10 20 22.316482221   14.81 13.80 10.92   ~ 263 1
31 NGC 4992 Sy2 13 09 05.597 +11 38 02.85   14.6       ~ 93 0
32 2MASX J13130580-1107424 Sy1 13 13 05.7811787784 -11 07 42.367592509   15.48 15.15 13.4   ~ 104 0
33 MCG-03-34-064 Sy2 13 22 24.485 -16 43 42.09   14   13.16   ~ 260 2
34 NVSS J133453-111300 Rad 13 34 53.0 -11 13 00           ~ 1 0
35 NGC 5252 Sy2 13 38 15.8711551761 +04 32 33.525903711   15.21 14.21     ~ 420 0
36 Mrk 268 Sy2 13 41 11.143 +30 22 41.35   15.60 14.66     ~ 162 0
37 2dFGRS TGN269Z012 G 13 51 33.24 -00 40 24.4   19.2   18.145   ~ 1 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-23:23:27

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