2004A&A...418..827M


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.22CEST07:02:26

2004A&A...418..827M - Astronomy and Astrophysics, volume 418, 827-840 (2004/5-2)

The HELLAS2XMM survey. V. Near-Infrared observations of X-ray sources with extreme X/O ratios.

MIGNOLI M., POZZETTI L., COMASTRI A., BRUSA M., CILIEGI P., COCCHIA F., FIORE F., LA FRANCA F., MAIOLINO R., MATT G., MOLENDI S., PEROLA G.C., PUCCETTI S., SEVERGNINI P. and VIGNALI C.

Abstract (from CDS):

We present the results of deep near-infrared observations (with ISAAC at VLT) of eleven hard X-ray selected sources in the Hellas2XMM survey, with faint optical magnitude (R>24) and high X-ray-to-optical flux ratio. All but one of the sources have been detected in the Ks band, with bright counterparts (Ks<19) and very red colors (R-K>5), and therefore belong to the ERO population. The quality of the near-infrared data is such that we can take advantage of the sub-arcsec seeing to obtain accurate morphological information. A detailed analysis of the surface brightness profiles allows us to classify all of the near-infrared counterparts. There are two point-like objects, seven elliptical (bulge) galaxies and one source with an exponential profile. None of the extended sources shows any evidence of the presence of a central unresolved object tracing the putative X-ray emitting AGN. Using both the R-K colors and the morphological information, we have estimated for all the sources a ``minimum photometric redshift'', ranging between 0.8 and 2.4; the elliptical hosts have zmin=0.9-1.4. We computed the X-ray properties using these redshifts: most of the sources have NH>1022cm–2, with unabsorbed X-ray luminosities up to 1045erg/s in the intrinsic 2-10keV band. These objects therefore belong to the long-sought population of obscured (type II) quasars and, from a statistical point of view, they are a non-negligible fraction (about 10%) of the most luminous AGN. Selecting the high X/O sources for a follow-up study in the near-infrared is therefore a powerful technique aimed at studying at high redshift the hosts of Type II AGN, whose obscured nuclei do not affect the host galaxy morphologies. Overall, our results seem to indicate that the hosts are mostly elliptical galaxies at z∼1, and that these near-IR bright objects would be among the most massive spheroids at these epochs.

Abstract Copyright:

Journal keyword(s): cosmology: observations - galaxies: active - infrared: galaxies - X-rays: galaxies

Nomenclature: Table 3: [MPC2004] JHHMMSS.ss+DDMMSS.s N=16.

Simbad objects: 30

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Number of rows : 30

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 ACO 2690 ClG 00 00 13.75 -25 11 11.5           ~ 23 0
2 [MPC2004] J000111.49-251208.7 NIR 00 01 11.49 -25 12 08.7           ~ 2 0
3 [MPC2004] J000111.50-251206.5 NIR 00 01 11.50 -25 12 06.5           ~ 5 0
4 NAME ACO 2690 29 Sy1 00 01 11.6 -25 12 03       25.1   ~ 9 0
5 WG 2 WD* 00 50 03.6494717240 -52 08 15.515729263 13.354 14.157 14.206 14.31 14.428 DA2.7 71 0
6 NAME BPM 16274 69 LIN 00 50 30.9 -52 00 48           ~ 9 0
7 [MPC2004] J005031.35-520634.2 NIR 00 50 31.35 -52 06 34.2           ~ 2 0
8 [MPC2004] J005031.51-520633.9 NIR 00 50 31.51 -52 06 33.9           ~ 2 0
9 NAME BPM1627 181 AGN 00 50 31.60 -52 06 30.0           ~ 3 0
10 [MPC2004] J031017.93-765957.9 NIR 03 10 17.93 -76 59 57.9           ~ 2 0
11 [MPC2004] J031018.93-765958.4 NIR 03 10 18.93 -76 59 58.4           ~ 2 0
12 HELLAS2XMM J031019.0-765958 X 03 10 18.96 -76 59 57.9       24.4   ~ 6 0
13 [MPC2004] J031113.65-765359.6 NIR 03 11 13.65 -76 53 59.6           ~ 2 0
14 HELLAS2XMM 03120031 X 03 11 13.86 -76 53 59.1       23.6   ~ 5 0
15 QSO J0311-7651 BLL 03 11 55.2500768688 -76 51 50.846014733 15.27 16.09 16.10 15.33   ~ 207 1
16 [MPC2004] J031342.68-765426.7 NIR 03 13 42.68 -76 54 26.7           ~ 2 0
17 [MPC2004] J031342.90-765423.9 NIR 03 13 42.90 -76 54 23.9           ~ 2 0
18 HELLAS2XMM J031343.5-765426 X 03 13 43.55 -76 54 26.3       24.6   ~ 6 0
19 [MPC2004] J031343.76-765419.6 NIR 03 13 43.76 -76 54 19.6           ~ 2 0
20 [MPC2004] J053911.35-283716.7 NIR 05 39 11.35 -28 37 16.7           ~ 2 0
21 HELLAS2XMM J053911.5-283717 X 05 39 11.5 -28 37 18       24.5   ~ 5 0
22 [MPC2004] J053911.60-283715.1 NIR 05 39 11.60 -28 37 15.1           ~ 3 0
23 [MPC2004] J053945.22-284909.8 NIR 05 39 45.22 -28 49 09.8           ~ 2 0
24 HELLAS2XMM J053945.3-284910 X 05 39 45.3 -28 49 11       25.0   ~ 5 0
25 QSO B0537-286 QSO 05 39 54.28147645 -28 39 55.9478122   19.70 20.0 18.789   ~ 234 2
26 [MPC2004] J054021.13-285037.6 NIR 05 40 21.13 -28 50 37.6           ~ 2 0
27 HELLAS2XMM J054021.2-285038 X 05 40 21.2 -28 50 38       23.7   ~ 5 0
28 HELLAS2XMM J054100.4-283905 X 05 41 00.4 -28 39 05       21.5   ~ 3 0
29 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 732 0
30 NAME ACO 2690 75 Sy2 23 59 56.6 -25 10 20       24.6   ~ 10 0

    Equat.    Gal    SGal    Ecl

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2019.10.22-07:02:26

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