2004MNRAS.348..529G

Query : 2004MNRAS.348..529G

2004MNRAS.348..529G - Mon. Not. R. Astron. Soc., 348, 529-550 (2004/February-3)

Powerful, obscured active galactic nuclei among X-ray hard, optically dim serendipitous Chandra sources.

GANDHI P., CRAWFORD C.S., FABIAN A.C. and JOHNSTONE R.M.

Abstract (from CDS):

We present a small sample of Chandra X-ray sources selected from the fields of ACIS observations which probe fluxes around the break in the hard band source counts. The targets of these fields include nine nearby galaxy clusters, one distant cluster and two powerful radio galaxy fields. The follow-up of this serendipitous sample was biased towards X-ray hard and optically dim sources mostly not seen on the Digitized Sky Survey; for these, we present X-ray fluxes, optical and near-infrared photometry leading to 51 photometric redshifts in all and 18 independently measured spectroscopic redshifts. Few sources are associated with the target fields themselves. 56 of 58 sources imaged in the K -band are detected at K ≲ 20 with Kmedian= 18, and of these, 38 have hard X-ray count ratios and 24 of these are significantly hard with most of the counts emerging about 2 keV. We find that almost all are active galactic nuclei (AGN) hosted in massive early-type host galaxies with a photometric redshift distribution peaking at z ∼ 1. Two type 2 quasars with intrinsic X-ray luminosity L ≳ 1045 erg/s, Fe Kα emission lines and absorbing column density NH> 1023 cm–2 - and NH≳ 1024 cm–2 in one case - are discussed in detail; the sample contains at least 12 potential type 2 quasars in all. We discuss various detection strategies for type 2 quasars and calculate their inferred space density. This combines and extends a number of results from subsamples already published by us.

Abstract Copyright: 2004 RAS

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

Nomenclature: Table 3: [GCF2004] Per N (No. 2), [GCF2004] RX J0820.9+0752 N (Nos 1-4), [GCF2004] B2 0902+34 N (No. 1), [GCF2004] IRAS 09104+4109 N (Nos 1-3), [GCF2004] ACO NNNN N N=14+2+4+8+2+17, [GCF2004] 3C 294 N (Nos 1-3), [GCF2004] MS 2137.3-2353 N (Nos 1-4).

Simbad objects: 78

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Number of rows : 78
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4897 2
2 CXOU J031946.4+413734 X 03 19 46.4 +41 37 34           ~ 2 0
3 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
4 [VV2006] J033229.9-275106 Sy2 03 32 29.8487 -27 51 05.879   27.5675 25.05 23.970 24.5370 ~ 101 0
5 [GCF2004] RX J0820.9+0752 1 X 08 21 00.2 +07 49 20           ~ 1 0
6 [GCF2004] RX J0820.9+0752 2 X 08 21 01.4 +07 49 52           ~ 1 0
7 BAX 125.2599+07.8631 ClG 08 21 02.4 +07 51 47           ~ 72 1
8 [GCF2004] RX J0820.9+0752 3 X 08 21 16.7 +07 53 52           ~ 1 0
9 [GCF2004] RX J0820.9+0752 4 X 08 21 18.0 +07 53 59           ~ 1 0
10 [GCF2004] B2 0902+34 1 X 09 05 21.7 +34 12 29   22.5       ~ 1 0
11 NVSS J090530+340756 rG 09 05 30.101 +34 07 56.90   24.0 23.800 23.500   ~ 163 1
12 CXOU J091340.9+410314 X 09 13 41.0 +41 03 15   22.5       ~ 2 0
13 IRAS 09104+4109 Sy2 09 13 45.4951283928 +40 56 28.215343572   19.69 19.21     ~ 260 1
14 [GCF2004] IRAS 09104+4109 2 X 09 13 52.9 +40 58 31   22.5       ~ 1 0
15 2XMM J091357.4+405937 QSO 09 13 57.4236339792 +40 59 37.570872192   21.5       ~ 4 0
16 [GCF2004] ACO 963 21 X 10 16 51.2 +39 04 19   25.2       ~ 1 0
17 [GCF2004] ACO 963 1 X 10 16 54.9 +39 04 30   25.2       ~ 1 0
18 [GCF2004] ACO 963 2 X 10 16 55.2 +39 02 52   25.2       ~ 1 0
19 [GCF2004] ACO 963 4 X 10 16 57.1 +39 03 32   25.2       ~ 1 0
20 [GCF2004] ACO 963 6 X 10 17 00.0 +39 03 21   24.03       ~ 1 0
21 ACO 963 ClG 10 17 03.4 +39 02 56           ~ 414 0
22 [GCF2004] ACO 963 7 X 10 17 05.6 +39 00 56   22.59       ~ 1 0
23 [GCF2004] ACO 963 8 X 10 17 08.6 +38 59 33   24.44       ~ 1 0
24 2MASS J10171012+3909015 G 10 17 10.111 +39 09 01.26   21.0       ~ 4 0
25 [GCF2004] ACO 963 12 X 10 17 13.4 +39 08 53   25.2       ~ 1 0
26 [GCF2004] ACO 963 13 X 10 17 13.5 +39 06 47   22.5       ~ 1 0
27 7C 101416.50+391624.00 QSO 10 17 14.10808 +39 01 23.8294   22.83 20.64     ~ 58 1
28 [GCF2004] ACO 963 16 X 10 17 17.5 +39 10 15   22.5       ~ 1 0
29 [GCF2004] ACO 963 17 X 10 17 21.0 +39 09 38   22.5       ~ 1 0
30 SDSS J101802.30+390006.2 QSO 10 18 02.298 +39 00 06.31   22.5       ~ 7 0
31 ACO 1795 ClG 13 48 47.4 +26 34 55           ~ 1330 0
32 CXOU J134849.0+263716 QSO 13 48 49.5 +26 37 11   22.5       ~ 3 0
33 CXOU J134905.8+263752 QSO 13 49 06.4 +26 37 48   22.5       ~ 4 0
34 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 727 1
35 CXOU J140106.9+024934 X 14 01 07.5 +02 49 30   22.5       ~ 3 0
36 [GCF2004] ACO 1835 3 X 14 01 30.5 +02 45 29   22.5       ~ 1 0
37 HELLAS2XMM J140144.9+025332 G 14 01 44.9 +02 53 33   19.6       ~ 2 0
38 [VV2006] J140149.9+024836 QSO 14 01 49.885 +02 48 36.60   22.5 20.87     ~ 7 0
39 [GCF2004] 3C 294 1 X 14 06 29.2 +34 12 36   22.5       ~ 1 0
40 [GCF2004] 3C 294 2 X 14 06 36.3 +34 01 16   22.5       ~ 1 0
41 3C 294 rG 14 06 44.317 +34 11 30.19           ~ 234 1
42 CXOMP J140644.8+341135 X 14 06 44.810 +34 11 35.74   22.5       ~ 3 0
43 [GCF2004] ACO 2199 1 X 16 28 07.2 +39 36 03   23.06       ~ 1 0
44 [GCF2004] ACO 2199 2 QSO 16 28 10.183 +39 35 11.89   24.02       ~ 2 0
45 [GCF2004] ACO 2199 3 X 16 28 11.5 +39 37 03   25.28       ~ 1 0
46 [GCF2004] ACO 2199 4 X 16 28 11.6 +39 37 12   25.00       ~ 1 0
47 [GCF2004] ACO 2199 5 X 16 28 12.1 +39 36 10   24.17       ~ 1 0
48 NGC 6166C LIN 16 28 23.3071691088 +39 34 13.066993524   16.5       ~ 77 1
49 [GCF2004] ACO 2199 7 X 16 28 24.0 +39 33 23   23.83       ~ 1 0
50 2XMM J162826.0+393352 G 16 28 26.1074744904 +39 33 53.317583676   20.30       ~ 5 0
51 CXOU J162827.8+392343 X 16 28 27.9 +39 23 34           ~ 2 0
52 ACO 2199 ClG 16 28 34.5 +39 32 26           ~ 1206 1
53 [GCF2004] ACO 2204 2 X 16 31 58.6 +05 39 03   22.5       ~ 1 0
54 [GCF2004] ACO 2204 1 X 16 32 37.2 +05 29 42   22.5       ~ 1 0
55 ACO 2204 ClG 16 32 47.7 +05 34 18           ~ 457 0
56 [GCF2002] MS 2137-4 QSO 21 39 52.4 -23 37 37   25.4       ~ 4 0
57 [GCF2002] MS 2137-3 X 21 40 12.2 -23 35 03   24.54       ~ 2 0
58 ClG 2137-2353 ClG 21 40 12.8 -23 39 27     18.5     ~ 390 0
59 [GCF2002] MS 2137-1 X 21 40 29.3 -23 47 41   22.5       ~ 3 0
60 [GCF2002] MS 2137-2 X 21 40 30.7 -23 47 46   22.5       ~ 2 0
61 [CGF2002] A4 X 21 53 00.91 +17 44 51.9   22.0       ~ 2 0
62 [CGF2002] A6 X 21 53 20.69 +17 41 19.2   22.5       ~ 2 0
63 [CGF2002] A8 X 21 53 23.78 +17 39 29.8   23.69       ~ 2 0
64 [GCF2004] ACO 2390 10 GiC 21 53 25.330 +17 43 21.75   22.39       ~ 5 0
65 [CGF2002] A12 QSO 21 53 29.01 +17 48 54.3   22.5       ~ 3 0
66 [CGF2002] A13 X 21 53 31.60 +17 47 04.0   22.5       ~ 2 0
67 [CGF2002] A14 X 21 53 32.82 +17 32 22.8   22.5       ~ 2 0
68 CXOU J215333.2+174209 QSO 21 53 33.2 +17 42 09   26.27 25.25     ~ 16 0
69 [VV2006] J215333.5+173736 QSO 21 53 33.6456300504 +17 37 35.491761480   22.0 20.98     ~ 5 0
70 CXOU J215333.8+174113 X 21 53 33.8 +17 41 13   24.32 23.64     ~ 6 0
71 CXOU J215334.0+174242 QSO 21 53 34.0 +17 42 40   26.11 25.39     ~ 9 0
72 [VV2006] J215334.8+173631 QSO 21 53 34.8427432512 +17 36 31.396088628     19.35     ~ 5 0
73 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 732 2
74 [GCF2004] ACO 2390 20 Sy2 21 53 40.8 +17 44 15   21.90       ~ 4 0
75 2MASS J21534555+1741477 Sy2 21 53 45.5580293976 +17 41 47.804531064   20.26       ~ 12 0
76 [CGF2002] A27 X 21 53 47.97 +17 42 47.6   21.97       ~ 2 0
77 [CGF2002] A26 X 21 53 47.98 +17 37 56.2   20.10       ~ 2 0
78 [CGF2002] A28 X 21 53 48.84 +17 41 59.8   22.20       ~ 2 0

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