2007A&A...469...47S


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET12:32:27

2007A&A...469...47S - Astronomy and Astrophysics, volume 469, 47-60 (2007/7-1)

EROs found behind lensing clusters. I. Stellar populations and dust properties of optical dropout EROs and comparison with related objects.

SCHAERER D., HEMPEL A., EGAMI E., PELLO R., RICHARD J., LE BORGNE J.-F., KNEIB J.-P., WISE M. and BOONE F.

Abstract (from CDS):

On the nature, redshift, stellar populations and dust properties of optically faint or non-detected extremely red objects. Determining the nature, redshift, stellar populations and dust properties of optically faint or non-detected, extremely red objects (ERO) found from our survey of the lensing clusters A1835 and AC114 (Richard et al., 2006A&A...456..861R). Comparison with properties of related galaxies, such as IRAC selected EROs and a z∼6.5 post-starburst galaxy candidate from the Hubble Ultra Deep Field. Using an updated version of Hyperz (Bolzonella et al., 2000A&A...363..476B) and a large number of spectral templates we perform broad-band SED fitting. The photometric observations, taken from Hempel et al. (2007, A&A, submitted), include deep optical, ACS/HST, ISAAC/VLT, IRAC/Spitzer data, and for some objects 24µm MIPS/Spitzer and sub-mm data as well. For most of the lensed EROs we find photometric redshifts showing a strong degeneracy between ``low-z'' (z∼1-3) and high-z (z∼6-7). Although formally best fits are often found at high-z, their resulting bright absolute magnitudes, the number density of these objects, and in some cases Spitzer photometry or longer wavelength observations, suggest strongly that all of these objects are at ``low-z''. The majority of these objects are best fitted with relatively young (≲0.5-0.7Gyr) and dusty starbursts. Three of our objects show indications for strong extinction, with AV∼2.4-4. The typical stellar masses of our objects are M*~(0.5-5)x1010M after correction for lensing; for the most extreme ERO in our sample, the sub-mm galaxy SMMJ14009+0252 most likely at zfit∼3, we estimate M*∼6.x1011M. For dusty objects star formation rates (SFR) have been estimated from the bolometric luminosity determined after fitting of semi-empirical starburst, ERO, and ULIRG templates. Typically we find SFR ~(1-18)M/yr. Again, SMMJ14009+0252 stands out as a LIRG with SFR ∼1000M/yr. Finally, we predict the mid-IR to sub-mm SED of the dusty objects for comparison with future observations with APEX, Herschel, and ALMA. Concerning the comparison objects, we argue that the massive post-starburst z∼6.5 galaxy candidate HUDF-J2 showing observed properties very similar to our EROs, is more likely a dusty starburst at z∼2.3-2.6. This interpretation also naturally explains the observed 24µm emission from this object and we predict its IR to sub-mm SED. Both empirically and from our SED fits we find that the IRAC selectec EROs from Yan et al. (2004ApJ...616...63Y) show very similar properties to our lensed EROs. Reasonable fits are found for most of them with relatively young and dusty stellar populations.

Abstract Copyright:

Journal keyword(s): galaxies: high-redshift - galaxies: evolution - galaxies: starburst - cosmology: early Universe - infrared: galaxies

Errata: erratum vol. 476, p. 97 (2007)

CDS comments: Table 1: objects are [RPS2006] ACO 1835 NN and [RPS2006] AC 114 NN in SIMBAD.

Simbad objects: 36

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Number of rows : 36

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME SMM J00266+1708 GiC 00 26 34.10 +17 08 33.7     23.30   21.979 ~ 30 0
2 IERO 12 G 03 32 29.818 -27 47 43.30   30.1685 27.85     ~ 9 0
3 BBG 2910 G 03 32 30.282 -27 47 58.38   28.9634 28.603     ~ 10 0
4 CXOCDFS J033232.2-274652 AGN 03 32 32.170 -27 46 51.49   28.3350 27.2830   26.411 ~ 42 0
5 IERO 6 G 03 32 33.25 -27 47 52.2   29.28 29.20   28.21 ~ 3 0
6 [SWM2014] GOODS-S 24289 AGN 03 32 33.677 -27 47 51.09   28.1169 28.33 26.52 25.300 ~ 28 0
7 CANDELS UDS F160W J033235.08-274647.6 AGN 03 32 35.076 -27 46 47.54 27.8738 27.6806 26.52   25.787 ~ 30 0
8 CANDELS UDS F160W J033235.74-274639.0 EmG 03 32 35.735 -27 46 39.03 28.5890 27.2787 26.58   26.0703 ~ 18 0
9 IERO 10 G 03 32 37.15 -27 48 23.5           ~ 2 0
10 NAME HUDF-J2 G 03 32 38.72681 -27 48 39.8845           ~ 26 1
11 GOODS-MUSIC 70264 G 03 32 38.763 -27 48 27.10   28.5002 27.03   26.60 ~ 9 0
12 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1343 0
13 [SPE2008] 921 G 03 32 39.120 -27 47 51.57   28.6930 27.07 27.31 26.4665 ~ 30 0
14 CXOCDFS J033239.2-274833 AGN 03 32 39.173 -27 48 32.35   28.180   26.63 26.045 ~ 52 1
15 GOODS J033241.75-274824.9 G 03 32 41.759 -27 48 24.89   30.2301 29.904   28.58 ~ 12 0
16 NAME HUDF-JD1 AGN 03 32 42.885 -27 48 09.51   31.2665 29.09   29.527 ~ 26 0
17 ASPECS LP.1mm.C06 G 03 32 43.526 -27 46 39.07   28.0435 27.14     ~ 23 0
18 GOODS J033243.67-274850.9 AGN 03 32 43.683 -27 48 50.88   29.8152 28.940     ~ 12 0
19 ZFOURGE CDFS 17494 G 03 32 48.555 -27 47 07.56   28.8087 27.227   25.5270 ~ 14 0
20 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5429 6
21 M 100 AGN 12 22 54.9318850854 +15 49 20.294302163 10.04 10.05 9.35     ~ 1683 2
22 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3893 4
23 NAME SMM J14009+0252 G 14 00 57.538 +02 52 49.85           ~ 43 0
24 [HSE2008] ACO 1835 305 G 14 00 58.278 +02 50 26.65           ~ 3 0
25 [HSE2008] ACO 1835 454 G 14 00 59.890 +02 50 57.59           ~ 3 0
26 [HSE2008] ACO 1835 493 G 14 01 01.484 +02 51 03.63           ~ 3 0
27 [HSE2008] ACO 1835 504 G 14 01 01.733 +02 51 05.26           ~ 3 0
28 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 636 1
29 [HSE2008] ACO 1835 311 G 14 01 05.013 +02 50 27.11           ~ 4 0
30 [HSE2008] ACO 1835 314 G 14 01 06.182 +02 50 27.74           ~ 3 0
31 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2727 4
32 NGC 6090 PaG 16 11 40.3 +52 27 21   14.0       ~ 402 2
33 SDSS J164501.07+462615.4 QSO 16 45 01.0722128835 +46 26 15.471165011           ~ 137 0
34 NGC 6949 AGN 20 35 06.9184292069 +64 48 10.059808826   15.0       ~ 55 0
35 [HSE2008] AC 114 1167 G 22 58 49.777 -34 46 54.95           ~ 3 0
36 ACO S 1077 ClG 22 58 52.34 -34 46 54.6           ~ 180 0

    Equat.    Gal    SGal    Ecl

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