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: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- 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. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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) -------------------------------------------------------------------------------- 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. -------------------------------------------------------------------------------- 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. -------------------------------------------------------------------------------- History: From electronic version of the journal
(End) Patricia Vannier [CDS] 07-Mar-2013
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