J/MNRAS/420/1684 End of red sequence galaxies in Galaxy Zoo (Wong+, 2012)
Galaxy Zoo: building the low-mass end of the red sequence with local
post-starburst galaxies.
Wong O.I., Schawinski K., Kaviraj S., Masters K.L., Nichol R.C.,
Lintott C., Keel W.C., Darg D., Bamford S.P., Andreescu D., Murray P.,
Raddick M.J., Szalay A., Thomas D., Vandenberg J.
<Mon. Not. R. Astron. Soc., 420, 1684-1692 (2012)>
=2012MNRAS.420.1684W 2012MNRAS.420.1684W
ADC_Keywords: Surveys ; Galaxies, spectra ; Spectroscopy ; Morphology
Keywords: galaxies: evolution
Abstract:
We present a study of local post-starburst galaxies (PSGs) using the
photometric and spectroscopic observations from the Sloan Digital Sky
Survey and the results from the Galaxy Zoo project. We find that the
majority of our local PSG population have neither early- nor late-type
morphologies but occupy a well-defined space within the colour-stellar
mass diagram, most notably, the low-mass end of the 'green valley'
below the transition mass thought to be the mass division between
low-mass star-forming galaxies and high-mass passively evolving
bulge-dominated galaxies.
Description:
In this paper, we obtain the photometric and spectroscopic data from
the SDSS DR7 (Abazajian et al., 2009, Cat. II/294) for all objects
classified as `galaxy' (Strauss et al., 2002AJ....124.1810S 2002AJ....124.1810S).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 107 80 General properties of our post-starburst galaxies
(PSG) sample
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See also:
II/294 : SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+ 2009)
J/MNRAS/396/818 : Blue early-type galaxies in Galaxy Zoo (Schawinski+, 2009)
J/ApJ/711/284 : Galaxy Zoo: AGN host galaxies (Schawinski+, 2010)
J/MNRAS/405/783 : Passive red spirals in Galaxy Zoo (Masters+, 2010)
J/MNRAS/410/166 : Morphological types from Galaxy Zoo 1 (Lintott+, 2011)
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- ObjID SDSS object identification
20- 21 I2 h RAh Galaxy centre's right ascension (J2000)
23- 24 I2 min RAm Galaxy centre's right ascension (J2000)
26- 29 F4.1 s RAs Galaxy centre's right ascension (J2000)
31 A1 --- DE- Galaxy centre's declination sign (J2000)
32- 33 I2 deg DEd Galaxy centre's declination (J2000)
35- 36 I2 arcmin DEm Galaxy centre's declination (J2000)
38- 41 F4.1 arcsec DEs Galaxy centre's declination (J2000)
43- 47 F5.2 mag rmag SDSS r-band magnitude
49- 52 F4.2 mag u-r SDSS u-r colour index
54- 56 F3.1 0.1nm EW(Hd) Hδ equivalent width
58 A1 --- l_S[OII] Limit flag on S[OII] (1)
59- 65 E7.2 10-19W/m2/nm S[OII] ? Measured [OII] flux density (5)
67 A1 --- l_SHa Limit flag on SHa
68- 74 E7.2 10-19W/m2/nm SHa ? Estimated upper limits for Hα flux
density (four times the rms noise) (5)
76- 80 F5.2 [Msun] logM* log of the stellar masses (2)
82- 86 F5.3 --- fm Weighted merger parameter
(Darg et al. 2010MNRAS.401.1043D 2010MNRAS.401.1043D)
88- 92 F5.3 --- dVf The SDSS parameter which gives the
fraction of light (in the r band) fitted
by a de Vaucouleurs profile
94 A1 --- Type [SEI] Type of galaxy (3)
96-107 A12 --- Com Comments (4)
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Note (1): The upper limits are defined to be four times the rms noise;
Note (2): log of the stellar masses obtained from Schawinski et al.
(2007MNRAS.382.1415S 2007MNRAS.382.1415S) which were determined by fitting the five SDSS
photometric bands to model star formation histories from Maraston
(1998MNRAS.300..872M 1998MNRAS.300..872M, 2005MNRAS.362..799M 2005MNRAS.362..799M) stellar models.
Note (3): Galaxy types are:
S = late-type spiral galaxies
E = early-type galaxies
I = intermediate-type galaxies
Note (4): Comments from visual inspection of each galaxy:
Disturbed = indicates that the stellar morphology appears to have been
disrupted by tidal interaction with features such as stellar
tails/rings or with neighbouring galaxies at close proximities
Asymmetric = defines an observed asymmetric stellar disc
- = represents galaxies whose morphologies appear fairly regular,
Blob = refers to galaxy morphologies which are small, compact and
fairly spherical in appearance
L = indicates that this galaxy exhibits spectral signatures of a
LINER
Note (5): Flux densities expressed in 10-17erg/cm2/s/Å
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 22-Sep-2012