J/MNRAS/412/727 SDSS red gal. automated morph. classification (Cheng+, 2011)
Automated morphological classification of Sloan Digital Sky Survey red sequence
galaxies.
Cheng J.Y., Faber S.M., Simard L., Graves G.J., Lopez E.D., Yan R.,
Cooper M.C.
<Mon. Not. R. Astron. Soc., 412, 727-747 (2011)>
=2011MNRAS.412..727C 2011MNRAS.412..727C (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galaxies, photometry ; Morphology
Keywords: galaxies: bulges - galaxies: elliptical and lenticular, cD -
galaxies: evolution - galaxies: structure
Abstract:
In the last decade, the advent of enormous galaxy surveys has motivated
the development of automated morphological classification schemes to
deal with large data volumes. Existing automated schemes can
successfully distinguish between early- and late-type galaxies and
identify merger candidates, but are inadequate for studying detailed
morphologies of red sequence galaxies. To fill this need, we present a
new automated classification scheme that focuses on making finer
distinctions between early types roughly corresponding to Hubble types
E, S0 and Sa. We visually classify a sample of 984 non-star-forming
Sloan Digital Sky Survey galaxies with apparent sizes >14-arcsec. We
then develop an automated method to closely reproduce the visual
classifications, which both provides a check on the visual results and
makes it possible to extend morphological analysis to much larger
samples. We visually classify the galaxies into three bulge classes
(BC) by the shape of the light profile in the outer regions: discs
have sharp edges and bulges do not, while some galaxies are
intermediate. We separately identify galaxies with features: spiral
arms, bars, clumps, rings and dust.
Description:
The sample is extracted from the spectroscopic catalogue of galaxies
in Data Release 4 (DR4) of the SDSS.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 205 984 Visual classifications and automated parameters
for 984 galaxies
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See also:
J/MNRAS/385/2097 : NUV-J colours of red-sequence galaxies (Rawle+, 2008)
J/A+A/525/A157 : SDSS automated morph. classification (Huertas-Company+ 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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2- 4 I3 --- Plate SDSS plate number
8- 12 I5 d MJD SDSS MJD number
16- 18 I3 --- Fiber SDSS Fibre number
22- 40 A19 --- ObjID SDSS ObjID designation
43- 49 F7.3 deg RAdeg Right ascension in decimal degrees (J2000)
52- 58 F7.3 deg DEdeg Declination in decimal degrees (J2000)
61- 67 F7.3 mag uMAG K-corrected absolute u magnitude
70- 76 F7.3 mag gMAG K-corrected absolute g magnitude
79- 85 F7.3 mag rMAG K-corrected absolute r magnitude
88- 94 F7.3 mag iMAG K-corrected absolute i magnitude
97-103 F7.3 mag zMAG K-corrected absolute z magnitude
106-112 F7.3 mag NUVMAG GALEX K-corrected absolute NUV magnitude
114-121 F8.3 mag FUVMAG GALEX K-corrected absolute FUV magnitude
125-130 F6.3 arcsec R50 SDSS Petrosian radius that encompass 50% of
the total Petrosian flux
134-139 F6.3 arcsec R90 SDSS Petrosian radius that encompass 90% of
the total Petrosian flux
144-148 F5.3 --- b/a Axis ratio b/a
153-157 F5.3 --- B/T GIM2d bulge fraction B/T
162-166 F5.3 --- s2 Smoothness parameter
170-175 F6.3 deg Incl Inclination
178 I1 --- BC [1/3] Visual Classification from bulge class
caracteristics (BC) (1)
181 I1 --- FE [1/3] Visual Classification from features
caracteristics (FEAT) (1)
184 I1 --- AR [1/3] Visual Classification from spiral arms
caracteristics (ARMS) (1)
187 I1 --- BA [1/3] Visual Classification from bars
caracteristics (BAR) (1)
190 I1 --- CL [1/3] Visual Classification from clumps
caracteristics (CLUMPS) (1)
193 I1 --- RI [1/3] Visual Classification from ring
caracteristics (RING) (1)
196 I1 --- DU [1/3] Visual Classification from dust
caracteristics (DUST) (1)
199 I1 --- DI [1/3] Visual Classification from disturbed
caracteristics (DIST) (1)
202 I1 --- IN [1/3] Visual Classification from interacting
caracteristics (INT) (1)
205 I1 --- Class Automated classification (1)
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Note (1): Automated classification code as follows:
1 = one-bulge
2 = two-intermediate
3 = three-disc
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 26-Sep-2011