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J/ApJ/685/904      Metal-rich dwarf galaxies from SDSS-DR4      (Peeples+, 2008)

Outliers from the mass-metallicity relation. I. A sample of metal-rich dwarf galaxies from SDSS. Peeples M.S., Pogge R.W., Stanek K.Z. <Astrophys. J., 685, 904-914 (2008)> =2008ApJ...685..904P
ADC_Keywords: Galaxies, optical ; Redshifts ; Abundances Keywords: galaxies: abundances - galaxies: dwarf - galaxies: evolution Abstract: We have identified a sample of 41 low-mass high-oxygen abundance outliers from the mass-metallicity relation of star-forming galaxies measured by Tremonti et al. (2004ApJ...613..898T). These galaxies, which have 8.6<12+log(O/H)<9.3 over a range of -14.4>MB>-19.1 and 7.4<log(M*/M)<10, are surprisingly nonpathological. They have typical specific star formation rates, are fairly isolated, and, with few exceptions, have no obvious companions. Morphologically, they are similar to dwarf spheroidal or dwarf elliptical galaxies. We predict that their observed high oxygen abundances are due to relatively low gas fractions, concluding that these are transitional dwarf galaxies nearing the end of their star formation activity. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 61 41 Full sample of low-luminosity mass-metallicity outliers
See also: II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) J/ApJ/695/259 : Massive metal-poor galaxies from SDSS (Peeples+, 2009) J/ApJ/676/286 : Spectral templates for galaxies from 0.2 to 10um (Assef+, 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) : SDSS home page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
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 24- 29 F6.2 [-] BMAG Absolute B-band magnitude (M_B_) (1) 31- 34 F4.2 [-] logM* Stellar mass from Tremonti et al. 2004ApJ...613..898T (2) 36- 41 F6.4 --- z Spectroscopic redshift not corrected for peculiar velocities 43- 61 A19 --- Note Note
Note (1): MB is measured using the low-resolution templates of Assef et al. (2008, Cat. J/ApJ/676/286) and corrected where necessary for peculiar velocities, as discussed in section 2. Note (2): Sample of metal-rich dwarf galaxies, sorted by MB. First 16 lines (above the horizontal line) are the very low mass (log[M*/M]<9.1) sample.
History: From electronic version of the journal References: Peeples et al. Paper II. 2009ApJ...695..259P Cat. J/ApJ/695/259
(End) Emmanuelle Perret [CDS] 04-Apr-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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