J/ApJ/847/18 Mass, Z, dust attenuation, and SFR relations (Zahid+, 2017)
Stellar absorption line analysis of local star-forming galaxies: the relation
between stellar mass, metallicity, dust attenuation, and star formation rate.
Zahid J. H., Kudritzki R.-P., Conroy C., Andrews B., Ho I.-T.
<Astrophys. J., 847, 18 (2017)>
=2017ApJ...847...18Z 2017ApJ...847...18Z
ADC_Keywords: Galaxies, spectra ; Stars, masses ; Abundances ; Extinction ;
Models
Keywords: galaxies: abundances; galaxies: evolution; galaxies: formation;
galaxies: ISM
Abstract:
We analyze the optical continuum of star-forming galaxies in the Sloan
Digital Sky Survey by fitting stacked spectra with stellar population
synthesis models to investigate the relation between stellar mass,
stellar metallicity, dust attenuation, and star formation rate. We fit
models calculated with star formation and chemical evolution histories
that are derived empirically from multi-epoch observations of the
stellar mass-star formation rate and the stellar mass-gas-phase
metallicity relations, respectively. We also fit linear combinations
of single-burst models with a range of metallicities and ages. Star
formation and chemical evolution histories are unconstrained for these
models. The stellar mass-stellar metallicity relations obtained from
the two methods agree with the relation measured from individual
supergiant stars in nearby galaxies. These relations are also
consistent with the relation obtained from emission-line analysis of
gas-phase metallicity after accounting for systematic offsets in the
gas-phase metallicity. We measure dust attenuation of the stellar
continuum and show that its dependence on stellar mass and star
formation rate is consistent with previously reported results derived
from nebular emission lines. However, stellar continuum attenuation is
smaller than nebular emission line attenuation. The
continuum-to-nebular attenuation ratio depends on stellar mass and is
smaller in more massive galaxies. Our consistent analysis of stellar
continuum and nebular emission lines paves the way for a comprehensive
investigation of stellar metallicities of star-forming and quiescent
galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 34 25 MZ* relation and attenuation data
table4.dat 32 125 MZ*-SFR relation data
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See also:
B/cfht : Log of CFHT Exposures (CADC, 1979-)
II/294 : SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
J/ApJ/617/240 : Oxygen abundances in the GOODS-N field (Kobulnicky+, 2004)
J/MNRAS/371/703 : MILES library of empirical spectra (Sanchez-Blazquez+, 2006)
J/A+A/495/53 : Physical properties of VVDS galaxies (Lamareille+, 2009)
J/ApJ/765/140 : Stacked spectra of SDSS star forming gal. (Andrews+, 2013)
J/A+A/550/A115 : Oxygen abundances and properties of galaxies (Hughes+, 2013)
J/ApJ/779/102 : Metallicities of RGB stars in dwarf galaxies (Kirby+, 2013)
J/A+A/581/A103 : CALIFA survey across the Hubble sequence (Gonzalez+, 2015)
http://wwwmpa.mpa-garching.mpg.de/SDSS/DR7/ : MPA-JHU DR7 release
http://www.sdss3.org/ : SDSS-III home page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 F5.2 [Msun] Mass [8.5/11] Mass; log(M*/M☉)
7- 15 F9.6 [Sun] LBSPSZ [-0.6/0.08] LookBack Stellar Population
Synthesis (LBSPS) model metallicity
log(Z/Z☉)
17- 25 F9.6 [Sun] SSBZ [-0.7/0.07] Sequential Single-Burst (SSB) model
metallicity log(Z/Z☉)
27- 34 F8.6 mag Av [0.1/0.8] Visual attenuation
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 5 F5.2 [Msun] logMass [8.5/11] log of Mass
7- 13 F7.4 [Msun/yr] logSFR [-1/1.4] log of star formation rate (1)
15- 23 F9.6 [Sun] logZ [-0.8/0.09] Metallicity from
fitting Sequential Single-Burst (SSB) models
25- 32 F8.6 mag Av [0.1/1] Dust attenuation
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Note (1): Median SFR corresponding to stacked spectra. See Figure 9.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 28-May-2018