J/ApJS/217/27 Morphologies of z<0.01 SDSS-DR7 galaxies (Ann+, 2015)
A catalog of visually classified galaxies in the local (z ∼ 0.01) universe.
Ann H.B., Seo M., Ha D.K.
<Astrophys. J. Suppl. Ser., 217, 27 (2015)>
=2015ApJS..217...27A 2015ApJS..217...27A
ADC_Keywords: Galaxies, nearby ; Morphology ; Photometry, SDSS
Keywords: catalogs; galaxies: general; galaxies: statistics; galaxies: structure
Abstract:
The morphological types of 5836 galaxies were classified by a visual
inspection of color images using the Sloan Digital Sky Survey Data
Release 7 to produce a morphology catalog of a representative sample
of local galaxies with z<0.01. The sample galaxies are almost complete
for galaxies brighter than rpet=17.77. Our classification system is
basically the same as that of the Third Reference Catalog of Bright
Galaxies with some simplifications for giant galaxies. On the other
hand, we distinguish the fine features of dwarf elliptical (dE)-like
galaxies to classify five subtypes: dE, blue-cored dwarf ellipticals,
dwarf spheroidals (dSph), blue dwarf ellipticals (dEblue), and dwarf
lenticulars (dS0). In addition, we note the presence of nucleation in
dE, dSph, and dS0. Elliptical galaxies and lenticular galaxies
contribute only ∼1.5 and 4.9% of local galaxies, respectively, whereas
spirals and irregulars contribute ∼32.1 and ∼42.8%, respectively. The
dEblue galaxies, which are a recently discovered population of
galaxies, contribute a significant fraction of dwarf galaxies. There
seem to be structural differences between dSph and dE galaxies. The
dSph galaxies are fainter and bluer with a shallower surface
brightness gradient than dE galaxies. They also have a lower fraction
of galaxies with small axis ratios (b/a≲0.4) than dE galaxies. The
mean projected distance to the nearest neighbor galaxy is ∼260 kpc.
About 1% of local galaxies have no neighbors with comparable
luminosity within a projected distance of 2Mpc.
Description:
This paper presents a catalog of the morphological types of galaxies
whose redshifts are less than z=0.01. The morphological types are
determined by a visual inspection of the color images provided by SDSS
DR7 (II/294). The majority of galaxies in the present sample come from
the KIAS-VAGC (Choi et al. 2010JKAS...43..191C 2010JKAS...43..191C) which is based on the
spectroscopic target galaxies of the SDSS DR7 complemented by the
bright galaxies with known redshifts from various catalogs.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 121 5840 Catalog of the morphological types of local galaxies
--------------------------------------------------------------------------------
See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
VII/250 : The 2dF Galaxy Redshift Survey (2dFGRS) (2dFGRS Team, 1998-2003)
VII/98 : Catalogue of 2810 nearby galaxies (Kraan-Korteweg, 1986)
J/MNRAS/446/3749 : SDSS nearby galaxies morphologies (Yoshino+, 2015)
J/MNRAS/445/630 : Early-type galaxies in Ursa Major cluster (Pak+, 2014)
J/MNRAS/435/2835 : Morphological types from Galaxy Zoo 2 (Willett+, 2013)
J/AJ/146/151 : Morphology catalog of nearby galaxies from SDSS (Oh+, 2013)
J/AJ/145/101 : Updated nearby galaxy catalog (Karachentsev+, 2013)
J/MNRAS/429/2264 : Anatomy of Ursa Majoris (Karachentsev+, 2013)
J/AJ/144/4 : Properties of dwarf galaxies in the LG (McConnachie+, 2012)
J/ApJ/743/123 : Motions of galaxies in Coma I cloud (Karachentsev+, 2011)
J/MNRAS/412/2498 : Galaxy groups in the local universe (Makarov+, 2011)
J/MNRAS/412/727 : SDSS red gal. automated morph. classification (Cheng+, 2011)
J/ApJ/722/L120 : Central surface brightness of SDSS galaxies (Fathi, 2010)
J/ApJ/711/361 : Local Group dE galaxies. II. (Geha+, 2010)
J/ApJS/186/427 : Detailed morphology of SDSS galaxies (Nair+, 2010)
J/MNRAS/398/1129 : Central galaxies in groups and clusters (Guo+, 2009)
J/ApJS/182/216 : Surface photometry of Virgo ellipticals (Kormendy+, 2009)
J/ApJ/660/1186 : VCC galaxies classification with SDSS (Lisker+, 2007)
J/AJ/128/163 : Galaxy morphological classification (Lotz+, 2004)
J/ApJS/147/29 : BRHalpha data of blue compact dwarf gal. (Gil De Paz+, 2003)
J/ApJS/147/1 : Classification of nearby galaxies (Conselice+, 2003)
J/ApJ/588/218 : i*g* photometry of SDSS EDR galaxies (Abraham+, 2003)
J/AJ/90/1681 : The Virgo Cluster Catalog (VCC) (Binggeli+, 1985)
http://www.sdss.org/ : SDSS home page
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- ID SDSS identifier (ObjID or SDSSJHHMMSS.ss+DDM)
20- 29 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
31- 40 F10.6 deg DEdeg Declination in decimal degrees (J2000)
42- 50 F9.6 --- z [-0.003/0.01] Heliocentric spectroscopic redshift
52- 58 A7 --- Morph Morphology from this study
60- 62 I3 --- T [-11/13] Numeric morphology index (1)
64- 68 F5.2 Mpc Dist [0/42.2] Distance (2)
70- 75 F6.2 mag rMag [-22.3/0.5] Absolute SDSS DR7 r band magnitude (3)
77- 81 F5.2 mag u-r [-2.3/15.5]?=-9 Extinction corrected model (u-r)
color index
83- 89 F7.1 pix amaj ?=-9 Isophotal semi-major axis measured at
µr=25mag/arcsec2
91- 95 F5.2 --- b/a [0/1]?=-9 Isophotal axis ratio
97-121 A25 --- Name Primary source identifier (4)
--------------------------------------------------------------------------------
Note (1): For practical purposes, the numerical type T borrowed from RC3 is
used with some simplification (see section 3.1):
* ellipticals: T=-5
* lenticulars: T=-3
* spirals have their Hubble stages from T=0 (S0/a) to T=9 (Sm)
* Irregulars: T=10 (Im), T=11 (dI), and
T=12 (irregulars containing small BCD-like components)
* Blue compact dwarf (BCD): T=13
* dwarf ellipticals: T=-6 (dE), T=-7 (dEbc), T=-8 (dSph), T=-9 (dEblue),
T=-10 (dS0, dS0p), and T=-11 for transition type dwarf (dEs/dI dI/dEs),
Note (2): Derived from the radial velocity relative to the Local Group.
Note (3): We use the model magnitude from SDSS DR7 corrected for the galactic
extinction (Schlegel et al. 1998ApJ...500..525S 1998ApJ...500..525S). The SDSS model
magnitude is a magnitude derived by best fitting model (exponential
profile or de Vaucouleurs profile) to the observed images.
Note (4): The first entry in NED is taken. In cases of no NED name, we make a
name using the coordinates of the galaxy similar to the SDSS
object name.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 11-May-2015