J/ApJ/695/259 Massive metal-poor galaxies from SDSS (Peeples+, 2009)
Outliers from the mass-metallicity relation.
II. A sample of massive metal-poor galaxies from SDSS.
Peeples M.S., Pogge R.W., Stanek K.Z.
<Astrophys. J., 695, 259-267 (2009)>
=2009ApJ...695..259P 2009ApJ...695..259P
ADC_Keywords: Galaxies, optical ; Redshifts ; Abundances
Keywords: galaxies: abundances - galaxies: evolution
Abstract:
We present a sample of 42 high-mass low-metallicity outliers from the
mass-metallicity relation of star-forming galaxies. These galaxies
have stellar masses that span log(M*/M☉)∼9.4 to 11.1 and are
offset from the mass-metallicity relation by -0.3 to -0.85dex in
12+log(O/H). In general, they are extremely blue, have high
star-formation rates for their masses, and are morphologically
disturbed. Tidal interactions are expected to induce large-scale gas
inflow to the galaxies' central regions, and we find that these
galaxies' gas-phase oxygen abundances are consistent with large
quantities of low-metallicity gas from large galactocentric radii
diluting the central metal-rich gas. We conclude with implications for
deducing gas-phase metallicities of individual galaxies based solely
on their luminosities, specifically in the case of long gamma-ray
burst host galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 37 42 Low-metallicity mass-metallicity outliers
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See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
J/ApJ/685/904 : Metal-rich dwarf galaxies from SDSS-DR4 (Peeples+, 2008)
J/A+A/459/85 : O/H and gas densities in star-forming galaxies (Nagao+, 2006)
J/A+A/448/955 : Abundances of emission galaxies in SDSS-DR3 (Izotov+, 2006)
http://www.sdss.org/ : SDSS home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 F8.4 deg RAdeg Right ascension in decimal degrees (J2000)
10- 17 F8.5 deg DEdeg Declination in decimal degrees (J2000)
19- 22 F4.2 [-] eps(O) Oxygen abundance (12+log(O/H)) from Tremonti
et al. 2004ApJ...613..898T 2004ApJ...613..898T
24- 28 F5.2 [-] logM* Stellar mass from Tremonti et al.
2004ApJ...613..898T 2004ApJ...613..898T (1)
30- 35 F6.4 --- z Redshift
37 A1 --- Note [s] "s" for spiral galaxy
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Note (1): Sample of massive low-metallicity galaxies, reverse sorted by
stellar mass.
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Nomenclature notes:
Galaxies are <[PPS2009] DDD.dddd+DD.ddddd> in Simbad.
History:
From electronic version of the journal
References:
Peeples et al. Paper I. 2008ApJ...685..904P 2008ApJ...685..904P Cat. J/ApJ/685/904
(End) Emmanuelle Perret [CDS] 04-Apr-2011