J/MNRAS/396/818 Blue early-type galaxies in Galaxy Zoo (Schawinski+, 2009)
Galaxy Zoo: a sample of blue early-type galaxies at low redshift.
Schawinski K., Lintott C., Thomas D., Sarzi M., Andreescu D., Bamford S.P.,
Kaviraj S., Khochfar S., Land K., Murray P., Nichol R.C., Raddick M.J.,
Slosar A., Szalay A., Vandenberg J., Yi S.K.
<Mon. Not. R. Astron. Soc., 396, 818-829 (2009)>
=2009MNRAS.396..818S 2009MNRAS.396..818S
ADC_Keywords: Surveys ; Galaxies, photometry ; Photometry, SDSS
Keywords: galaxies: elliptical and lenticular, cD - galaxies: evolution -
galaxies: formation - galaxies: fundamental parameters -
galaxies: starburst
Abstract:
We report the discovery of a population of nearby, blue early-type
galaxies with high star formation rates (0.5<SFR<50M☉/yr).
They are identified by their visual morphology as provided by Galaxy
Zoo for Sloan Digital Sky Survey Data Release 6 and their u-r colour.
We select a volume-limited sample in the redshift range 0.02<z<0.05,
corresponding to luminosities of approximately L* and above and with
u-r colours significantly bluer than the red sequence. We confirm the
early-type morphology of the objects in this sample and investigate
their environmental dependence and star formation properties.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 76 215 A catalogue of blue early-type galaxies
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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/MNRAS/405/783 : Galaxy Zoo: passive red spirals (Masters+, 2010)
J/MNRAS/410/166 : Galaxy Zoo 1 (Lintott+, 2011)
http://www.sdss.org : SDSS Home Page
http://data.galaxyzoo.org : Galaxy Zoo Home Page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- SDSS SDSS Object ID
20- 21 I2 h RAh Right ascension (J2000)
23- 24 I2 min RAm Right ascension (J2000)
26- 29 F4.1 s RAs Right ascension (J2000)
31 A1 --- DE- Declination sign (J2000)
32- 33 I2 deg DEd Declination (J2000)
35- 36 I2 arcmin DEm Declination (J2000)
38- 41 F4.1 arcsec DEs Declination (J2000)
43- 49 F7.5 --- z Redshift
51- 56 F6.2 mag rMAG Absolute r magnitude
58- 62 F5.3 mag u-r SDSS u-r colour index
64- 68 F5.2 Msun/yr SFR ?=- Star formation rate (1)
70- 76 A7 --- Class Emission Line Class (2)
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Note (1): The aperture-corrected Hα SFR. This is given only for the
objects classified as starforming by the emission line diagrams.
Note (2): Emission line classification:
* SF (star forming galaxies);
* AGN (active galactic nucleus);
* LINER (Low Ionisation Nuclear Emission Region);
* Seyfert (AGN with highly ionized gas emission from nucleus);
* objects with S/N≤3 in the four main lines are given as '-'.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 07-Feb-2011