J/MNRAS/421/1043 Emission-line galaxies from SDSS DR7 (Shirazi+, 2012)
Strongly star forming galaxies in the local Universe with nebular
He II λ4686 emission.
Shirazi M., Brinchmann J.
<Mon. Not. R. Astron. Soc., 421, 1043-1063 (2012)>
=2012MNRAS.421.1043S 2012MNRAS.421.1043S
ADC_Keywords: Galaxies, spectra ; Abundances
Keywords: stars: Wolf-Rayet - galaxies: evolution - galaxies: star formation -
galaxies: stellar content
Abstract:
We present a sample of 2865 emission-line galaxies with strong nebular
HeIIλ4686 emissions in the Sloan Digital Sky Survey Data
Release 7 and use this sample to investigate the origin of this line
in star-forming galaxies. We show that star-forming galaxies and
galaxies dominated by an active galactic nucleus form clearly
separated branches in the HeIIλ4686/Hβ versus
[NII]λ6584/Hα diagnostic diagram and derive an empirical
classification scheme which separates the two classes. We also present
an analysis of the physical properties of 189 star-forming galaxies
with strong HeIIλ4686 emissions. These star-forming galaxies
provide constraints on the hard ionizing continuum of massive stars.
Description:
Our sample is based on galaxy spectra from SDSS DR7 which cover a
wavelength range of 3800-9200Å.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 93 3165 The positions and the identifications of galaxies
with nebular HeIIλ4686 emission
table5.dat 98 194 The positions and identifications of the sample of
SF galaxies with nebular HeIIλ4686 emission
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See also:
II/294 : SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
VII/260 : SDSS-DR7 quasar catalog (Schneider+, 2010)
J/A+AS/136/35 : WR galaxies and HII regions catalog (Schaerer+ 1999)
J/ApJ/655/851 : Wolf-Rayet galaxies in the SDSS (Zhang+, 2007)
J/A+A/485/657 : Physical parameters of Wolf-Rayet galaxies (Brinchmann+, 2008)
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 11 F5.2 s RAs Right ascension (J2000)
13 A1 --- DE- Declination sign (J2000)
14- 15 I2 deg DEd Declination (J2000)
17- 18 I2 arcmin DEm Declination (J2000)
20- 24 F5.2 arcsec DEs Declination (J2000)
26- 29 I4 --- Plate SDSS Plate number
30 A1 --- --- [-]
31- 35 I5 --- MJD SDSS MJD number
36 A1 --- --- [-]
37- 39 I3 --- Fib SDSS Fiber number
41- 45 F5.2 [-] logHeII/Hb ?=- Abundance HeII/Hβ
47- 51 F5.2 [-] log[NII]/Ha ?=- Abundance [NII]/Hα
53- 65 A13 --- Class Classification (1)
67- 79 A13 --- BPT Classification from Baldwin, Phillips and
Terlevich (1981PASP...93....5B 1981PASP...93....5B) (1)
81- 84 A4 --- SN "OKSN" for galaxies having SN>3 in their
[OIII]λ5007, Hβ,
[NII]λ6584 and Hα lines
86- 91 A6 --- WR WR features: "WR" or "Non-WR"
93 I1 --- WRcl [0/3]? WR classification: 0=no, 3=certain (G1)
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Note (1): classes are AGN, COMP, Low S/N Liner, Low SN SF, or SF
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Plate SDSS Plate number
5 A1 --- --- [-]
6- 10 I5 --- MJD SDSS MJD number
11 A1 --- --- [-]
12- 14 I3 --- Fib SDSS Fiber number
16- 22 F7.5 --- z Redshift
24- 25 I2 h RAh Right ascension (J2000)
27- 28 I2 min RAm Right ascension (J2000)
30- 34 F5.2 s RAs Right ascension (J2000)
36 A1 --- DE- Declination sign (J2000)
37- 38 I2 deg DEd Declination (J2000)
40- 41 I2 arcmin DEm Declination (J2000)
43- 47 F5.2 arcsec DEs Declination (J2000)
49- 51 I3 --- ID [2/199] Identification number
53- 57 F5.2 [-] logHeII/Hb ?=- Abundance HeII/Hβ
59- 63 F5.2 [-] log[NII]/Ha ?=- Abundance [NII]/Hα
65- 68 F4.2 [-] e(O) Abundance, 12+logO/H
70- 73 F4.2 [-] e_e(O) rms uncertainty on e(O)
75- 80 A6 --- WR WR features: "WR" or "Non-WR"
82 I1 --- WRcl [0/3]? WR classification: 0=no, 3=certain (G1)
84- 98 A15 --- OName Other names
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Global notes:
Note (G1): WR classification following Brinkmann et al., 2008,
Cat. J/A+A/485/657, as follows:
0 = no WR galaxy
1 = possible WR galaxy
2 = very probable WR galaxy
3 = certain WR galaxy
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Oct-2012