2014A&A...569A..98T


Query : 2014A&A...569A..98T

2014A&A...569A..98T - Astronomy and Astrophysics, volume 569A, 98-98 (2014/9-1)

Dust and gas in luminous proto-cluster galaxies at z = 4.05: the case for different cosmic dust evolution in normal and starburst galaxies.

TAN Q., DADDI E., MAGDIS G., PANNELLA M., SARGENT M., RIECHERS D., BETHERMIN M., BOURNAUD F., CARILLI C., DA CUNHA E., DANNERBAUER H., DICKINSON M., ELBAZ D., GAO Y., HODGE J., OWEN F. and WALTER F.

Abstract (from CDS):

We measure the dust and gas content of the three submillimeter galaxies (SMGs) in the GN20 proto-cluster at z=4.05 using new IRAM Plateau de Bure interferometer (PdBI) CO(4-3) and 1.2-3.3 mm continuum observations. All these three SMGs are heavily dust obscured, with UV-based star formation rate (SFR) estimates significantly smaller than the ones derived from the bolometric infrared (IR), consistent with the spatial offsets revealed by HST and CO imaging. Based also on evaluations of the specific SFR, CO-to-H2 conversion factor and gas depletion timescale, we classify all the three galaxies as starbursts (SBs), although with a lower confidence for GN20.2b that might be a later stage merging event. We place our measurements in the context of the evolutionary properties of main sequence (MS) and SB galaxies. ULIRGs have 3-5 times larger L'CO/Mdust and Mdust/M* ratios than z=0 MS galaxies, but by z∼2 the difference appears to be blurred, probably due to differential metallicity evolution. SB galaxies appear to slowly evolve in their L'CO/Mdust and Mdust/M* ratios all the way to z>6 (consistent with rapid enrichment of SB events), while MS galaxies rapidly increase in Mdust/M* from z=0 to 2 (due to gas fraction increase, compensated by a decrease of metallicities). While no IR/submm continuum detection is available for indisputably normal massive galaxies at z>2.5, we show that if metallicity indeed decrease rapidly for these systems at z>3 as claimed in the literature, we should expect a strong decrease of their Mdust/M*, consistent with recent PdBI and ALMA upper limits. We conclude that the Mdust/M* ratio could be a powerful tool for distinguishing starbursts from normal galaxies at z>4.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: high-redshift - galaxies: starburst - galaxies: star formation - submillimeter: galaxies

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME Himiko EmG 02 17 57.6122 -05 08 44.898           ~ 100 0
2 ALESS J033229.29-275619.7 QSO 03 32 29.2912 -27 56 19.465     26.76 25.82 25.1655 ~ 107 0
3 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4781 2
4 Mrk 116 PaG 09 34 02.1 +55 14 25           ~ 1074 1
5 AzTEC 3 G 10 00 20.690 +02 35 20.37           ~ 96 0
7 NAME SMM J123652+621225 smm 12 36 51.976 +62 12 25.80           ~ 152 0
8 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 1069 1
9 [PSD2006] GN20.2a G 12 37 08.840 +62 22 02.37     25.150     ~ 42 0
10 [PSD2006] GN20.2b smm 12 37 09.73 +62 22 02.6           ~ 17 0
11 NAME SMM J123711+622212 AGN 12 37 11.92 +62 22 12.1   27.1786 25.185   24.4196 ~ 189 0
12 QSO J1415+1129 QSO 14 15 46.25 +11 29 43.4   17.63 17.23     ~ 627 0
13 NAME G15.v2.779 G 14 24 13.9 +02 23 04           ~ 47 0
14 NAME MS 1512-cB58 AGN 15 14 22.2751 +36 36 25.674     20.64   20.35 ~ 321 0
15 NAME HFLS 3 G 17 06 47.8 +58 46 23           ~ 128 0
16 NAME Eyelash LeG 21 35 11.60 -01 02 52.0           ~ 213 0
17 NAME Cosmic Eye G 21 35 12.730 -01 01 42.90           ~ 85 0

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2023.01.30-05:03:43

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