2010MNRAS.403.1474S

Query : 2010MNRAS.403.1474S

2010MNRAS.403.1474S - Mon. Not. R. Astron. Soc., 403, 1474-1490 (2010/April-2)

The central energy source of 70 µm-selected galaxies: starburst or AGN ?

SYMEONIDIS M., ROSARIO D., GEORGAKAKIS A., HARKER J., LAIRD E.S., PAGE M.J. and WILLMER C.N.A.

Abstract (from CDS):

We present the first active galactic nuclei (AGN) census in a sample of 61 galaxies selected at 70µm, a wavelength which should strongly favour the detection of star-forming systems. For the purpose of this study, we take advantage of deep Chandra X-ray and Spitzer infrared (3.6-160µm) data, as well as optical spectroscopy and photometry from the Deep Extragalactic Evolutionary Probe 2 (DEEP2) survey for the Extended Groth Strip (EGS) field, as part of the All-Wavelength Extended Groth Strip International Survey. We investigate spectral line diagnostics ([Oiii]/Hβ and [Neiii]/[Oii] ratios, Hδ Balmer absorption line equivalent widths and the strength of the 4000Å break), X-ray luminosities and spectral energy distributions (SEDs). We find that the 70-µm sources are undergoing starburst (SB) episodes and are therefore characterized by a predominance of young stars. In addition, 13 per cent of the sources show AGN signatures and hence potentially host an AGN. When the sample is split into SBs (1010 < LIR< 1011L☉), luminous infrared Galaxies (LIRGs; 1011 < LIR< 1012L☉) and ultraluminous infrared Galaxies (ULIRGs; 1012 < LIR< 1013L☉), the AGN fraction becomes 0, 11 and 23 per cent, respectively, showing an increase with total infrared luminosity. However, by examining the sources' panchromatic SEDs, we conclude that although the AGN is energetically important in 1 out of 61 objects all 70-µm-selected galaxies are primarily powered by star formation. When compared to a sample of DEEP2 galaxies in the same redshift range and with similar optical colours, we find that the 70-µm population is characterized by younger stellar ages and a higher AGN incidence, indicating that strongly star-forming populations might be a key in studying the relationship between black hole and stellar growth.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

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

VizieR on-line data: <Available at CDS (J/MNRAS/403/1474): table4.dat>

Nomenclature: Table 4: EGS70 NNN N=61 among (Nos 20-172).

Simbad objects: 48

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Number of rows : 48
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 NAME Extended Groth Strip reg 14 19 +52.8           ~ 1023 0
3 EGS70 158 G 14 21 37.50 +53 17 17.8       22.1   ~ 3 0
4 EGS70 172 G 14 21 41.10 +53 15 03.8       23.1   ~ 2 0
5 EGS70 147 G 14 21 54.30 +53 19 51.4       22.3   ~ 2 0
6 EGS70 150 G 14 21 55.40 +53 18 10.4       22.0   ~ 2 0
7 EGS70 165 G 14 21 55.90 +53 14 22.1       21.7   ~ 2 0
8 EGS70 141 G 14 22 11.80 +53 19 50.0       22.7   ~ 2 0
9 EGS70 155 G 14 22 17.70 +53 14 32.7       18.6   ~ 2 0
10 EGS70 146 G 14 22 18.10 +53 16 43.6       20.1   ~ 2 0
11 EGS70 149 G 14 22 21.10 +53 14 33.9       20.3   ~ 2 0
12 EGS70 138 G 14 22 22.30 +53 21 58.2       21.1   ~ 2 0
13 EGS70 140 G 14 22 25.40 +53 20 30.0       19.4   ~ 2 0
14 EGS70 152 G 14 22 31.10 +53 12 37.5       20.0   ~ 2 0
15 EGS70 144 G 14 22 36.80 +53 15 01.1       19.3   ~ 2 0
16 EGS70 124 G 14 22 39.10 +53 24 20.3       21.3   ~ 3 0
17 EGS70 125 G 14 22 47.30 +53 22 20.2       20.7   ~ 2 0
18 EGS70 122 G 14 22 50.00 +53 22 53.3       19.4   ~ 2 0
19 EGS70 134 G 14 22 56.30 +53 17 10.1       21.9   ~ 2 0
20 EGS70 121 G 14 23 00.10 +53 21 51.9       22.1   ~ 2 0
21 EGS70 114 G 14 23 01.147 +53 24 19.45       20.8   ~ 3 0
22 SDSS J142306.05+531529.0 QSO 14 23 06.0535709904 +53 15 28.997982324   18.34   18.27 18.07 ~ 20 0
23 EGS70 115 G 14 23 12.70 +53 22 16.0       20.1   ~ 2 0
24 EGS70 126 G 14 23 14.70 +53 17 59.5       21.2   ~ 2 0
25 EGS70 93 G 14 23 16.10 +53 30 47.4       22.6   ~ 2 0
26 EGS70 110 G 14 23 18.20 +53 24 53.5       21.3   ~ 2 0
27 DEEP2-GRS 14010918 AGN 14 23 22.88 +53 19 29.9       21.6 18.38 ~ 3 0
28 EGS70 94 G 14 23 30.90 +53 28 22.5       21.7   ~ 2 0
29 EGS70 100 G 14 23 31.235 +53 26 25.67       19.3   ~ 4 0
30 EGS70 98 G 14 23 35.40 +53 26 12.3       20.1   ~ 2 0
31 EGS70 103 G 14 23 39.60 +53 22 32.0       19.0   ~ 2 0
32 EGS70 77 G 14 23 43.10 +53 35 06.1       19.2   ~ 2 0
33 SDSS J142348.80+533006.2 BiC 14 23 48.8024711616 +53 30 06.222354912       22.0   ~ 4 0
34 EGS70 88 G 14 23 49.40 +53 26 29.8       21.5   ~ 2 0
35 EGS70 82 G 14 23 49.60 +53 31 35.4       23.4   ~ 2 0
36 EGS70 85 G 14 24 01.20 +53 27 54.4       19.9   ~ 2 0
37 EGS70 78 G 14 24 08.20 +53 31 22.3       20.3   ~ 2 0
38 EGS70 41 G 14 24 26.10 +53 37 23.0       20.9   ~ 2 0
39 EGS70 55 G 14 24 28.20 +53 36 44.6       21.6   ~ 2 0
40 EGS70 76 G 14 24 29.60 +53 31 21.3       22.6   ~ 2 0
41 EGS70 67 G 14 24 30.10 +53 35 42.9       22.1   ~ 3 0
42 EGS70 51 G 14 24 34.30 +53 36 05.4       18.6   ~ 2 0
43 EGS70 70 G 14 24 41.50 +53 33 43.2       21.3   ~ 2 0
44 EGS70 72 G 14 24 55.00 +53 30 04.6       20.4   ~ 2 0
45 EGS70 58 G 14 25 02.80 +53 31 25.5       22.3   ~ 3 0
46 IC 1127 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 3090 4
47 NGC 6240 Sy2 16 52 58.9 +02 24 03   14.31 13.37     ~ 1734 2
48 NGC 7213 Bla 22 09 16.2100443720 -47 10 00.115999716   10.97 12.08 10.50 10.6 ~ 700 1

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