J/A+A/462/535 Low-metallicity HII regions and galaxies (Yin+, 2007)
Empirical strong-line oxygen abundance calibrations from galaxies with
electron-temperature measurements.
Yin S.Y., Liang Y.C., Hammer F., Brinchmann J., Zhang B., Deng L.C.,
Flores H.
<Astron. Astrophys., 462, 535-546 (2007)>
=2007A&A...462..535Y 2007A&A...462..535Y
ADC_Keywords: Galaxies, spectra ; H II regions ; Abundances
Keywords: galaxies: abundances - galaxies: evolution - galaxies: ISM -
galaxies: spiral - galaxies: starburst - galaxies: stellar content
Abstract:
Our aims are to estimate the validity of empirical methods, such as
R23, R23-P, log([NII]/Hα) (N2),
log[([OIII]/Hβ)/([NII]/Hα] (O3N2), and log([SII]/Hα)
(S2), and to re-derive (or add) the calibrations of R23, N2, O3N2, and
S2 indices for oxygen abundances on the basis of a large sample of
galaxies with Te-based abundances.
We determined the gas-phase oxygen abundance for a sample of 695
galaxies and HII regions with reliable detections of [OIII]4363,
using the reliable and direct temperature-sensitive (Te) method of
measuring metallicity. We selected 531 star-forming galaxies from the
SDSS-DR4 database with strong emission lines, including [OIII]4363
detected at a signal-to-noise ratio higher than 5σ, as well as
164 galaxies and HII regions from the literature with Te
measurements. The O/H abundances were derived from a two-zone model
for the temperature structure, assuming a relationship between high
ionization and low ionization species.
Description:
We selected 531 galaxies from the SDSS-DR4 (Adelman-McCarthy et al.,
2006, Cat. II/267) and gathered 164 low-metallicity HII regions and
galaxies from the literature in this study.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 112 531 The characteristic parameters of the SDSS galaxies
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See also:
http://www.sdss.org/ : SDSS Home Page
II/267 : The SDSS Photometric Catalog, Release 4 (Adelman-McCarthy+, 2006)
II/276 : The SDSS Photometric Catalog, Release 5 (Adelman-McCarthy+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number
5- 8 I4 --- Plate SDSS-DR4 plate number
10- 14 I5 d MJD SDSS-DR4 MJD
16- 18 I3 --- Fiber SDSS-DR4 fiber number
20- 38 A19 --- SDSS SDSS name (JHHMMSS.ss+DDMMSS.s)
40- 44 F5.3 10+4K t3 Electron temperature
46- 50 F5.3 10+4K e_t3 rms uncertainty on t3
52- 56 F5.3 --- [O/H] Bayesian O abundance (12+log(O/H))
58- 62 F5.3 --- e_[O/H] rms uncertainty on [O/H]
64- 68 F5.3 --- [O/H]1 Bayesian [O/H] abundance obtained by the
MPA/JHU group
70- 75 F6.3 --- N2/Ha log([NII]6483/Hα) abundance ratio
77- 81 F5.3 --- e_N2/Ha rms uncertainty on N2
83- 88 F6.3 --- S2/Ha log([SII]6717,6731/Hα) abundance ratio
90- 94 F5.3 --- e_S2/Ha rms uncertainty on S2
96-100 F5.3 --- O3N2 log(([OIII]5007/Hβ)/([NII]6483/Hα))
abundance ratio
102-106 F5.3 --- e_O3N2 rms uncertainty on O3N2
108-112 F5.3 --- P P=[OIII]/([OII]+[OIII]) abundance ratio
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 11-Sep-2007