J/MNRAS/421/2888 Gas exchanges between galaxies and IGM (Rodrigues+, 2012)
A decrease of the gas exchanges between galaxies and the intergalactic medium,
from 12 to 6 billion years ago.
Rodrigues M., Puech M., Hammer F., Rothberg B., Flores H.
<Mon. Not. R. Astron. Soc., 421, 2888-2903 (2012)>
=2012MNRAS.421.2888R 2012MNRAS.421.2888R
ADC_Keywords: Galaxy catalogs ; Abundances
Keywords: galaxies: evolution - galaxies: high-redshift - galaxies: ISM
Abstract:
Using a representative sample of 65 intermediate-mass galaxies at
z∼0.6, we have investigated the interplay between the main
ingredients of chemical evolution: metal abundance, gas mass, stellar
mass and star formation rate (SFR). All quantities have been estimated
using deep spectroscopy and photometry from ultraviolet to infrared
and assuming an inversion of the Kennicutt-Schmitt law for the gas
fraction. Six billion years ago, galaxies had a mean gas fraction of
32±3 per cent, i.e. twice that of their local counterparts. Using
higher redshift samples from the literature, we explore the gas phases
and estimate the evolution of the mean gas fraction of distant
galaxies over the last 11Gyr.
Description:
The galaxies presented in this paper are a subsample of Rodrigues et
al. (2008A&A...492..371R 2008A&A...492..371R) which have available archival Hubble Space
Telescope (HST) data. The imaging is used to measure their gas radius
and to derive their gas fraction. The targets have been gathered from
the IMAGES-FORS2 survey, a representative sample drawn from both
spectroscopic and MJ selection criteria (see Rodrigues et al.,
2008A&A...492..371R 2008A&A...492..371R).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 89 65 Basic data from galaxies in the sample: redshift
and stellar mass estimated from SED fitting
table2.dat 64 65 Gas fraction, oxygen abundance and effective yield
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Name (G1)
21- 25 F5.3 --- z Redshift
27- 32 F6.3 [Msun] logM* Stellar mass
33- 37 F5.2 Msun/yr SFRUV ?=- UV stellar formation rate (1)
39- 45 F7.3 Msun/yr SFRIR ?=- IR stellar formation rate
47- 51 F5.3 Msun/yr e_SFRIR ?=- rms uncertainty on SFRIR
53- 58 F6.2 Msun/yr SFRHb ?=- Hβ stellar formation rate,
corrected for extinction and aperture (2)
60- 64 F5.2 Msun/yr e_SFRHb ?=- rms uncertainty on SFRHb (2)
66- 72 F7.3 Msun/yr SFRTot ?=- Total stellar formation rate
74- 78 F5.2 Msun/yr e_SFRTot ?=- rms uncertainty on SFRTot
80- 84 F5.2 kpc Rg Gas extension
86- 89 F4.2 kpc e_Rg rms uncertainty on Rg
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Note (1): To determine SFR UV, we used the rest-frame 2800Å luminosity
from SED fitting.
Note (2): Galaxies with limits on extinction have lower limits on SFR Hβ.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Name (G1)
21- 25 F5.2 [Msun] logM* Stellar mass
27- 31 F5.2 [Msun] logMg Gas mass
33- 36 F4.2 [Msun] e_logMgg ? rms uncertainty on logMg
38- 42 F5.2 % fg Gas fraction (3)
44- 48 F5.2 % e_fg ?=- Error on fg (lower value) (4)
50- 54 F5.2 % E_fg ?=- Error on fg (upper value) (4)
56- 59 F4.2 [-] e(O) Oxygen abundance, 12+log(O/H)
61- 64 F4.2 [-] e_e(O) rms uncertainty on e(O) (5)
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Note (3): The gas fractions have been estimated using the KS law.
Note (4): Uncertainties are from the uncertainties of the SFR Total and gas
radius. Galaxies with limits of SFR Total have upper limits of gas faction.
Note (5): The uncertainties in metallicity are from uncertainties of extinction
and emission-line flux measurement.
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Global notes:
Note (G1): Nomenclature note:
* Names written NN.NNNN are in Simbad,
* Names written JHHMMSS.ss+DDMMSS.s are in Simbad
* Names written UDSFNN are <[LHF2004] UDSF NN> in Simnad.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 07-Mar-2013