2010A&A...522A..11R


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.24CET09:36:45

2010A&A...522A..11R - Astronomy and Astrophysics, volume 522, A11-11 (2010/11-1)

Optically faint X-ray sources in the Chandra deep field North: Spitzer constraints.

ROVILOS E., GEORGANTOPOULOS I., AKYLAS A. and FOTOPOULOU S.

Abstract (from CDS):

We investigate the properties of the most optically faint sources in the GOODS-N area (RAB>26.5). These extremely optically faint populations present an uncharted territory although they represent an appreciable fraction of the X-ray sources in the GOODS-N field. The optically faint sources are believed to contain either red active galactic nuclei (AGN) at moderate redshifts or possibly quasi stellar objects (QSOs) at very high redshift. We compile our sample by first finding the 3.6µm IRAC counterparts of the X-ray sources and in turn by searching for the optical counterparts of the IRAC sources. No counterparts were found for 35 objects in the R-band Subaru optical images. Of these, 18 have HST ACS counterparts, while the remaining have no optical counterparts. The vast majority of our 35 sources are classified as extremely red objects (EROs) on the basis of their V606-KS lower limits. Their derived photometric redshifts show that these populate moderate redshifts (median z∼2.8), being at markedly different redshifts from the already spectroscopically identified population which peaks at z∼0.7. The Spitzer IRAC mid-IR colours of the sources without HST counterparts tend to lie within the mid-IR colour diagram AGN ``wedge'', suggesting either QSO, ultra luminous infrared galaxy (ULIRG; Mrk231) templates or early-type galaxy templates at z>3. A large fraction of our sources (17/35), regardless of whether they have HST counterparts, can be classified as mid-IR bright/optically faint sources (dust obscured galaxies) a class of sources which is believed to include many heavily absorbed AGN. The co-added X-ray spectrum of the optically faint sources is very flat, with a spectral index of Γ≃0.87, significantly flatter than the spectrum of the X-ray background. The optically faint (R>26.5) X-ray sources constitute more than 50 per cent of the total X-ray population at redshifts z>2, bearing important implications for the luminosity function and its evolution. Considering X-ray sources with 2<z<4 we find good agreement with a modified pure luminosity evolution (PLE) model.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: high-redshift - X-rays: galaxies - infrared: galaxies

Simbad objects: 39

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Number of rows : 39

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 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1774 1
2 CXOHDFN J123605.8+620837 X 12 36 05.85 +62 08 37.9     26.8 26.6 26.1 ~ 9 0
3 CXOHDFN J123608.6+621435 X 12 36 08.592 +62 14 35.77 27.7 26.7 26.9 26.1 26.8 ~ 8 0
4 CXOHDFN J123613.1+621224 X 12 36 13.07 +62 12 24.1 25.5 25.5 25.8 25.8 25.7 ~ 9 0
5 CXOHDFN J123614.1+621017 G 12 36 14.1389 +62 10 17.489   29.2 28.5 29.1   ~ 11 0
6 CXOHDFN J123615.8+621515 AGN 12 36 15.8 +62 15 16 28.5 28.8 26.6 27.2 26.3 ~ 17 0
7 CXOHDFN J123621.1+621303 X 12 36 21.11 +62 13 03.6 26.2 26.3 26.0 25.5 25.2 ~ 7 0
8 [ABB2003] CDFN 129 AGN 12 36 21.9571 +62 16 03.617 27.4 27.1   27.0 27.3 ~ 14 0
9 CXOHDFN J123623.7+621009 G 12 36 23.6973 +62 10 09.095 29.8   27.7 27.5 26.5 ~ 13 0
10 AzGN 10 rG 12 36 27.52 +62 12 18.3 27.7 28.7 27.1   27.10 ~ 21 0
11 MODS wide 2039 G 12 36 28.8185 +62 11 40.074 29.0   28.5   29.4 ~ 8 0
12 [R2000] J123631.246+620957.79 X 12 36 31.23 +62 09 57.7 27.1 27.1 26.3 26.2 25.0 ~ 15 0
13 [ABB2003] CDFN 181 AG? 12 36 34.4556 +62 09 42.342 26.9 27.4 27.9 26.9 27.1 ~ 11 0
14 CXOHDFN J123636.8+621320 G 12 36 36.88 +62 13 20.1 30.0 27.9 28.6 28.3 26.49 ~ 21 0
15 [PAR2004] GOODS J123637.12+620636.7 AG? 12 36 37.1215 +62 06 36.713 27.4 27.4   25.8 27.0 ~ 6 0
16 [ABB2003] CDFN 199 X 12 36 37.28 +62 10 14.2 27.4 28.2 27.3 26.3 25.4 ~ 5 0
17 CXOHDFN J123638.9+621041 X 12 36 38.97 +62 10 41.4     29.2   27.10 ~ 11 0
18 [AVB2002] J123639.65+620936.7 X 12 36 39.65 +62 09 36.7     28.6 28.0 27.5 ~ 8 0
19 CXOHDFN J123642.0+621331 AGN 12 36 42.0509 +62 13 31.733 26.61 27.03 26.43 25.8 24.9 ~ 63 0
20 CXOHDFN J123648.0+621019 AG? 12 36 47.9408 +62 10 20.589 28.2 26.8   27.2 26.8 ~ 16 0
21 NAME Chandra Deep Field-North reg 12 36.8 +62 13           ~ 603 0
22 CXOHDFN J123648.3+621456 X 12 36 48.30 +62 14 56.3 27.8 27.6 27.6 27.7 26.27 ~ 11 0
23 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 892 1
24 CXOHDFN J123656.5+621513 G 12 36 56.54 +62 15 12.8   26.7 28.1 27.0 26.20 ~ 13 0
25 GOODS J123657.66+622126.7 G 12 36 57.6614 +62 21 26.723 24.5 24.00   22.43 22.024 ~ 17 0
26 [ABB2003] CDFN 302 X 12 36 58.74 +62 14 59.2 28.8 26.2 26.5 26.0 25.2 ~ 5 0
27 CXOHDFN J123659.2+621832 X 12 36 59.20 +62 18 32.3 28.1 26.9 26.6 26.2 26.0 ~ 9 0
28 NAME SMM J123701+621148 rG 12 37 01.55 +62 11 46.3 28.69 25.8 25.7 25.30 25.30 ~ 47 1
29 CXOHDFN J123702.3+621925 AG? 12 37 02.4353 +62 19 25.966 26.4 25.3 27.1 25.5 26.9 ~ 12 0
30 [ABB2003] CDFN 329 X 12 37 03.85 +62 15 30.9 27.5 27.2 27.1 27.0 26.3 ~ 5 0
31 CXOHDFN J123705.1+621635 X 12 37 05.10 +62 16 34.8 28.2   27.3 27.3 26.4 ~ 10 0
32 NAME SMM J123712.1+621212 AG? 12 37 12.0385 +62 12 12.340 27.8 27.4 27.3 26.1 25.9 ~ 34 0
33 CXOHDFN J123713.7+621546 X 12 37 13.70 +62 15 45.7 31.6 27.0 26.6 26.4 26.1 ~ 9 0
34 NAME SMM J123713.9+621827 AGN 12 37 13.86 +62 18 26.2     27.4 27.3 26.5 ~ 26 1
35 CXOHDFN J123725.5+621707 X 12 37 25.52 +62 17 07.6     26.3 25.7 26.9 ~ 8 0
36 CXOHDFN J123734.0+621623 AG? 12 37 34.0933 +62 16 24.807 28.4 28.8 27.2 25.3 25.42 ~ 10 0
37 CXOHDFN J123737.0+621834 AG? 12 37 37.0590 +62 18 34.502 27.7 28.1   26.9 27.2 ~ 12 0
38 [R2000] J123750.274+621359.01 X 12 37 50.23 +62 13 59.0   26.8 27.0 26.2 25.2 ~ 12 0
39 Mrk 231 Sy1 12 56 14.2340989340 +56 52 25.238555193   14.68 13.84     ~ 1749 3

    Equat.    Gal    SGal    Ecl

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2020.01.24-09:36:45

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