J/MNRAS/421/398 Gas and stellar metallicities in HII galaxies (Westera+, 2012)
Gas and stellar metallicities in H II galaxies.
Westera P., Cuisinier F., Curty D., Buser R.
<Mon. Not. R. Astron. Soc., 421, 398-407 (2012)>
=2012MNRAS.421..398W 2012MNRAS.421..398W
ADC_Keywords: Galaxies, spectra ; H II regions ; Spectroscopy
Keywords: ISM: abundances - galaxies: abundances - galaxies: evolution -
galaxies: starburst
Abstract:
We examine the gas and stellar metallicities in a sample of HII
galaxies from the Sloan Digital Sky Survey, which possibly contains
the largest homogeneous sample of HII galaxy spectra to date.
We eliminated all spectra with an insufficient signal-to-noise ratio,
without strong emission lines and without the [OII] λ3727Å
line, which is necessary for the determination of the gas metallicity.
This excludes galaxies with redshift ~<0.033. Our final sample
contains ∼700 spectra of HII galaxies.
Description:
For this work, we used spectra from the SDSS Data Release 7.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 82 712 Line strengths, internal reddening, gas
metallicities, and total stellar masses of
individual spectra
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See also:
http://www.sdss.org : SDSS Hone Page
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 5 I5 d MJD MJD SDSS spectroscopic ID
6 A1 --- --- [-]
7- 10 I4 d Plate Plate SDSS spectroscopic ID
11 A1 --- --- [-]
12- 14 I3 --- Fiber Fiber SDSS spectroscopic ID
16- 21 F6.3 aW/m2 I(Hb) Hβ 4861Å intensity
(in 10-15erg.cm-2.s-1)
23- 27 F5.3 --- I(Ha) Flux ratio of Hα 6563Å (1)
29- 33 F5.3 --- I([OII]) Flux ratio of [OII] 3727Å (1)
35- 39 F5.3 --- S/N Signal-to-noise ratio for [OII]
41- 45 F5.3 --- I([OIII]1) Flux ratio of [OIII] 4959Å (1)
47- 51 F5.3 --- I([OIII]2) Flux ratio of [OIII] 5007Å (1)
53- 57 F5.3 --- I([NII]1) Flux ratio of [NII] 6548Å (1)
59- 63 F5.3 --- I([NII]2) Flux ratio of [NII] 6584Å (1)
65- 69 F5.3 mag E(B-V) Internal redenning
71- 76 F6.3 --- [O/H]P Gas metallicity [O/H]P
78- 82 F5.2 10+9Msun Mtot Total stellar mass
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Note (1): Normalized to Hβ.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 18-Oct-2012