2008MNRAS.385.1015S

Query : 2008MNRAS.385.1015S

2008MNRAS.385.1015S - Mon. Not. R. Astron. Soc., 385, 1015-1028 (2008/April-1)

The properties of 70 µm-selected high-redshift galaxies in the Extended Groth Strip.

SYMEONIDIS M., WILLNER S.P., RIGOPOULOU D., HUANG J.-S., FAZIO G.G. and JARVIS M.J.

Abstract (from CDS):

We examine the infrared properties of 43 high-redshift (0.1 < z < 1.2), infrared-luminous galaxies in the Extended Groth Strip (EGS), selected by a deep 70µm survey with the Multiband Imaging Photometer on Spitzer (MIPS). In addition and with reference to starburst-type spectral energy distributions (SEDs), we derive a set of equations for estimating the total infrared luminosity (LIR) in the range 8-1000µm using photometry from at least one MIPS band. 42 out of 43 of our sources' optical/infrared SEDs (λobserved< 160 µm) are starburst type, with only one object displaying a prominent power-law near-infrared continuum. For a quantitative analysis, models of radiation transfer in dusty media are fit on to the infrared photometry, revealing that the majority of galaxies are represented by high extinction, Av> 35, and for a large fraction (∼50 per cent) the SED turns over into the Rayleigh-Jeans regime at wavelengths longward of 90µm. For comparison, we also fit semi-empirical templates based on local galaxy data; however, these underestimate the far-infrared SED shape by a factor of at least 2 and in extreme cases up to 10 for the majority (∼70 per cent) of the sources. Further investigation of SED characteristics reveals that the mid-infrared (70/24µm) continuum slope is decoupled from various galaxy properties such as the total infrared luminosity and far-infrared peak, quantified by the L160/L70ratio. In view of these results, we propose that these high-redshift galaxies have different properties to their local counterparts, in the sense that large amounts of dust cause heavy obscuration and are responsible for an additional cold emissive component, appearing as a far-infrared excess in their SEDs.

Abstract Copyright: 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): galaxies: general - galaxies: high-redshift - galaxies: photometry - galaxies: starburst

Nomenclature: Table 1: EGS70 NNN N=43 among (Nos 41-172).

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 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
2 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
3 NAME Extended Groth Strip reg 14 19 +52.8           ~ 1023 0
4 EGS70 158 G 14 21 37.50 +53 17 17.8       22.1   ~ 3 0
5 EGS70 172 G 14 21 41.10 +53 15 03.8       23.1   ~ 2 0
6 EGS70 147 G 14 21 54.30 +53 19 51.4       22.3   ~ 2 0
7 EGS70 150 G 14 21 55.40 +53 18 10.4       22.0   ~ 2 0
8 EGS70 165 G 14 21 55.90 +53 14 22.1       21.7   ~ 2 0
9 EGS70 141 G 14 22 11.80 +53 19 50.0       22.7   ~ 2 0
10 EGS70 155 G 14 22 17.70 +53 14 32.7       18.6   ~ 2 0
11 EGS70 146 G 14 22 18.10 +53 16 43.6       20.1   ~ 2 0
12 EGS70 149 G 14 22 21.10 +53 14 33.9       20.3   ~ 2 0
13 EGS70 138 G 14 22 22.30 +53 21 58.2       21.1   ~ 2 0
14 EGS70 140 G 14 22 25.40 +53 20 30.0       19.4   ~ 2 0
15 EGS70 152 G 14 22 31.10 +53 12 37.5       20.0   ~ 2 0
16 EGS70 144 G 14 22 36.80 +53 15 01.1       19.3   ~ 2 0
17 EGS70 124 G 14 22 39.10 +53 24 20.3       21.3   ~ 3 0
18 EGS70 125 G 14 22 47.30 +53 22 20.2       20.7   ~ 2 0
19 EGS70 122 G 14 22 50.00 +53 22 53.3       19.4   ~ 2 0
20 EGS70 134 G 14 22 56.30 +53 17 10.1       21.9   ~ 2 0
21 EGS70 121 G 14 23 00.10 +53 21 51.9       22.1   ~ 2 0
22 EGS70 114 G 14 23 01.147 +53 24 19.45       20.8   ~ 3 0
23 SDSS J142306.05+531529.0 QSO 14 23 06.0535709904 +53 15 28.997982324   18.34   18.27 18.07 ~ 20 0
24 EGS70 115 G 14 23 12.70 +53 22 16.0       20.1   ~ 2 0
25 EGS70 126 G 14 23 14.70 +53 17 59.5       21.2   ~ 2 0
26 EGS70 93 G 14 23 16.10 +53 30 47.4       22.6   ~ 2 0
27 EGS70 110 G 14 23 18.20 +53 24 53.5       21.3   ~ 2 0
28 DEEP2-GRS 14010918 AGN 14 23 22.88 +53 19 29.9       21.6 18.38 ~ 3 0
29 EGS70 94 G 14 23 30.90 +53 28 22.5       21.7   ~ 2 0
30 EGS70 100 G 14 23 31.235 +53 26 25.67       19.3   ~ 4 0
31 EGS70 98 G 14 23 35.40 +53 26 12.3       20.1   ~ 2 0
32 EGS70 103 G 14 23 39.60 +53 22 32.0       19.0   ~ 2 0
33 EGS70 77 G 14 23 43.10 +53 35 06.1       19.2   ~ 2 0
34 SDSS J142348.80+533006.2 BiC 14 23 48.8024711616 +53 30 06.222354912       22.0   ~ 4 0
35 EGS70 88 G 14 23 49.40 +53 26 29.8       21.5   ~ 2 0
36 EGS70 82 G 14 23 49.60 +53 31 35.4       23.4   ~ 2 0
37 EGS70 85 G 14 24 01.20 +53 27 54.4       19.9   ~ 2 0
38 EGS70 78 G 14 24 08.20 +53 31 22.3       20.3   ~ 2 0
39 EGS70 41 G 14 24 26.10 +53 37 23.0       20.9   ~ 2 0
40 EGS70 55 G 14 24 28.20 +53 36 44.6       21.6   ~ 2 0
41 EGS70 76 G 14 24 29.60 +53 31 21.3       22.6   ~ 2 0
42 EGS70 67 G 14 24 30.10 +53 35 42.9       22.1   ~ 3 0
43 EGS70 51 G 14 24 34.30 +53 36 05.4       18.6   ~ 2 0
44 EGS70 70 G 14 24 41.50 +53 33 43.2       21.3   ~ 2 0
45 EGS70 72 G 14 24 55.00 +53 30 04.6       20.4   ~ 2 0
46 EGS70 58 G 14 25 02.80 +53 31 25.5       22.3   ~ 3 0
47 IC 1127 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 3090 4
48 NGC 6090 PaG 16 11 40.3 +52 27 21   14.0       ~ 446 1

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