2011A&A...526A..46G


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.12CET23:28:27

2011A&A...526A..46G - Astronomy and Astrophysics, volume 526A, 46-46 (2011/2-1)

X-ray observations of sub-mm LABOCA galaxies in the eCDFS.

GEORGANTOPOULOS I., ROVILOS E. and COMASTRI A.

Abstract (from CDS):

We explore the X-ray properties of the 126 sub-mm galaxies (SMGs) of the LABOCA survey in the CDFS and the eCDFS regions. SMGs are believed to experience massive episodes of star formation. Our goal is to examine whether star formation coexists with AGN activity, determine the fraction of highly obscured AGN, and finally to obtain an idea of the dominant power mechanism in these sources. Using Spitzer and radio arcsecond positions for the SMGs, we find 14 sources with significant X-ray detections. For most of these there are only photometric redshifts available, with their median redshift at ∼2.3. Taking only the CDFS area into account that has the deepest X-ray observations, we estimate an X-ray AGN fraction of <26±9% among SMGs. The X-ray spectral properties of the majority of the X-ray AGN that are associated with SMGs are consistent with high obscuration, >1023cm–2, but there is no unambiguous evidence of Compton-thick sources. Detailed spectral energy distribution fittings show that the bulk of total IR luminosity originates in star forming processes, although a torus component is usually present. Finally, stacking analysis of the X-ray undetected SMGs reveals a signal in the soft (0.5-2keV) and marginally in the hard (2-5keV) X-ray bands. The hardness ratio of the stacked signal is relatively soft (-0.40±0.10) corresponding to Γ∼1.6. This argues against a high fraction of Compton-thick sources among the X-ray undetected SMGs.

Abstract Copyright:

Journal keyword(s): X-rays: general - X-rays: diffuse background - X-rays: galaxies - astrochemistry

Simbad objects: 23

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Number of rows : 23

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 [DSS2017] 107 G 03 31 35.894 -27 54 43.44       26.73   ~ 7 0
2 [VTU2006] 202 G 03 31 38.280 -27 43 39.04       24.43   ~ 8 0
3 LESS J033150.8-274438 PaG 03 31 50.81 -27 44 38.5           ~ 26 0
4 ALESS J033151.11-274437.3 AGN 03 31 51.11 -27 44 37.6 25.31 24.52 24.21 23.66 23.05 ~ 40 0
5 [LBX2017] 41 AGN 03 31 51.417 -27 45 53.07       25.58   ~ 16 0
6 [LBX2017] 42 Sy2 03 31 51.94 -27 53 27.2 26.57 25.14 25.38 24.74   ~ 54 0
7 LESS J033154.2-275109 PaG 03 31 54.22 -27 51 09.8           ~ 19 0
8 ALESS J033154.50-275105.6 AGN 03 31 54.50 -27 51 05.6 26.42 25.10 25.03 24.48 24.22 ~ 33 0
9 [LBX2017] 214 AGN 03 32 11.382 -27 52 13.45       26.8   ~ 33 0
10 [LBX2017] 248 AGN 03 32 13.846 -27 56 00.09 27.86 28.22 27.73 25.6 25.90 ~ 48 0
11 [LBX2017] 453 AGN 03 32 25.273 -27 52 30.77   27.15 27.00 27.01 26.581 ~ 34 0
12 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1751 1
13 ALESS J033243.20-275514.3 AGN 03 32 43.1879 -27 55 14.295 26.14 24.85 24.52 24.42 24.26 ~ 52 0
14 LESS J033243.3-275517 PaG 03 32 43.28 -27 55 17.9           ~ 32 0
15 [SWM2014] GOODS-S 11763 AGN 03 32 46.84416 -27 51 21.2040 24.82 24.216 24.07 24.202 23.595 ~ 33 0
16 [ABB2003] CDFS 317 AGN 03 33 03.695 -27 44 10.46   26.95 26.37 25.44 24.03 ~ 12 0
17 [HSN2014] 66507 AGN 03 33 16.51610 -27 50 39.4670 21.25 19.64 19.11 18.60 18.02 ~ 35 0
18 [DSS2017] 9332 AGN 03 33 31.97 -27 54 10.3 21.03 21.18 21.13 20.79 20.64 ~ 31 0
19 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5220 6
20 [OM2008] 100 QSO 10 44 09.95 +58 52 24.7 24.29     23.56   ~ 25 0
21 NAME Chandra Deep Field-North reg 12 36.8 +62 13           ~ 601 0
22 Mrk 231 Sy1 12 56 14.2340989340 +56 52 25.238555193   14.68 13.84     ~ 1737 3
23 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2623 4

    Equat.    Gal    SGal    Ecl

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2019.11.12-23:28:27

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