J/ApJS/220/3 SDSS-DR7 isolated galaxy morphologies (Khim+, 2015)
Demographics of isolated galaxies along the Hubble sequence.
Khim H.-G., Park J., Seo S.-W., Lee J., Smith R., Yi S.K.
<Astrophys. J. Suppl. Ser., 220, 3 (2015)>
=2015ApJS..220....3K 2015ApJS..220....3K (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra ; Equivalent widths ; Morphology ; Redshifts ;
Photometry, SDSS
Keywords: galaxies: elliptical and lenticular, cD; galaxies: general;
galaxies: interactions; galaxies: spiral; galaxies: statistics;
methods: data analysis
Abstract:
Isolated galaxies in low-density regions are significant in the sense
that they are least affected by the hierarchical pattern of galaxy
growth and interactions with perturbers, at least for the last few
gigayears. To form a comprehensive picture of the star-formation
history of isolated galaxies, we constructed a catalog of isolated
galaxies and their comparison sample in relatively denser
environments. The galaxies are drawn from the Sloan Digital Sky Survey
Data Release 7 in the redshift range of 0.025<z<0.044. We performed a
visual inspection and classified their morphology following the Hubble
classification scheme. For the spectroscopic study, we make use of the
catalog provided by Oh et al. (2011ApJS..195...13O 2011ApJS..195...13O). We confirm most
of the earlier understanding on isolated galaxies. The most remarkable
additional results are as follows. Isolated galaxies are dominantly
late type with the morphology distribution
(E:S0:S:Irr)=(9.9:11.3:77.6:1.2)%. The frequency of elliptical
galaxies among isolated galaxies is only a third of that of the
comparison sample. Most of the photometric and spectroscopic
properties are surprisingly similar between the isolated and
comparison samples. However, early-type isolated galaxies are less
massive by 50% and younger (by Hβ) by 20% than their counterparts
in the comparison sample. This can be explained as a result of
different merger and star-formation histories for differing
environments in the hierarchical merger paradigm.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 185 6069 Morphology catalog including photometric and
spectroscopic properties
catalog.fits 2880 244 Original version of the catalog in FITS format
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See also:
VII/257 : 2MASS-selected Isolated Galaxies (2MIG) (Karachentseva+, 2010)
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
VII/74 : Atlas of Peculiar Galaxies (Arp 1966)
J/A+A/578/A110 : Isolated galaxies, pairs & triplets (Argudo-Fernandez+, 2015)
J/A+A/564/A94 : CIG sample 3-D environment (Argudo-Fernandez+, 2014)
J/AJ/146/151 : Morphology cat. of nearby galaxies from SDSS DR7 (Oh+, 2013)
J/A+A/560/A9 : The isolation degree AMIGA revision (Argudo-Fernandez+, 2013)
J/MNRAS/434/325 : AMIGA galaxies physical parameters (Fernandez Lorenzo+ 2013)
J/A+A/545/A15 : AMIGA XI. Optical nuclear activity (Sabater+, 2012)
J/A+A/540/A47 : AMIGA X. Isolated galaxy colors (Fernandez Lorenzo+, 2012)
J/MNRAS/405/783 : Passive red spirals in Galaxy Zoo (Masters+, 2010)
J/AJ/139/2525 : UNAM-KIAS cat. of isolated galaxies (Hernandez-Toledo+, 2010)
J/ApJS/186/427 : Detailed morphology of SDSS galaxies (Nair+, 2010)
J/MNRAS/397/1756 : Fourier-derived param. of the CIG sample (Durbala+, 2009)
J/MNRAS/390/881 : Phot. characterization of the CIG sample (Durbala+, 2008)
J/AJ/136/2115 : SDSS/CIG galaxies classification (Hernandez-Toledo+, 2008)
J/AJ/136/773 : Structure of classical bulges & pseudobulges (Fisher+, 2008)
J/A+A/486/73 : AMIGA VII. FIR and radio study (Sabater+, 2008)
J/A+A/485/475 : AMIGA. VI. Radio fluxes of the isolated galaxies (Leon+ 2008)
J/ApJS/176/414 : Galaxy clusters in the SDSS-DR5 (Yoon+, 2008)
J/A+A/472/121 : AMIGA V. Isolation parameters (Verley+, 2007)
J/MNRAS/379/867 : BCG C4 cluster catalog (von der Linden+, 2007)
J/A+A/470/505 : AMIGA IV. Neighbours around CIG galaxies (Verley+, 2007)
J/A+A/462/507 : AMIGA III. IRAS data (Lisenfeld+, 2007)
J/A+A/449/937 : AMIGA. II. Morphological refinement (Sulentic+, 2006)
J/AJ/131/1288 : Composite spectra of early-type galaxies (Bernardi+, 2006)
J/A+A/436/443 : AMIGA I. Velocities of CIG galaxies (Verdes-Montenegro+ 2005)
J/AJ/129/2062 : SDSS DR1 isolated galaxies (Allam+, 2005)
J/A+A/420/873 : Properties of isolated disk galaxies (Varela+, 2004)
J/ApJ/598/260 : Satellites orbiting isolated galaxies (Prada+, 2003)
J/A+A/393/389 : Hα in HII regions in spiral galaxies (Marquez+, 2002)
J/A+A/374/394 : Gas & stars kinematics in disc galaxies (Vega Beltran+ 2001)
J/ApJS/107/1 : Morphologies of distant galaxies II (Abraham+ 1996)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 18 I18 --- objID SDSS objID identifier
20- 21 I2 --- MT [10/50] Morphological type (1)
23- 31 F9.5 deg RAdeg Right ascension in decimal degrees (J2000)
33- 41 F9.5 deg DEdeg Declination in decimal degrees (J2000)
43- 51 F9.7 --- z [0.02/0.05] Redshift
53- 58 F6.3 mag g-r0 [-0.2/18.6] k-corrected g-r color index
60- 66 F7.3 mag rMag0 [-23.4/-19.7] k-corrected r-band absolute
magnitude
68- 74 F7.3 arcsec aRad [30/968.1] Major isophotal radius from
the SDSS pipeline (ISOA_R)
76- 81 F6.3 arcsec bRad [7.8/92.3] Minor isophotal radius from
the SDSS pipeline (ISOB_R)
83- 87 F5.3 --- C [1.2/4.7] Concentration index in r-band
(Cr=petroR90/petroR50)
89- 93 F5.3 --- fdeV [0/1] de Vaucouleurs fraction of the r-band
from the SDSS pipeline (FracDeV)
95-100 F6.3 [Msun] logM* [9.5/30.8] Stellar mass
102-108 F7.3 km/s sig [10.4/361]? Effective velocity dispersion
(σeff)
110-116 F7.3 km/s e_sig [0/931]? sig error (2)
118-122 F5.3 0.1nm WHb [0.08/6.3]? Hβ equivalent width in Å (3)
124-128 F5.3 0.1nm W5270 [0.03/6]? Fe5270 equivalent width in Å (3)
130-134 F5.3 0.1nm <WFe> [0/4.4]? Mean Fe equivalent width in Å (3)
136-140 F5.3 0.1nm WMgb [0.01/5.5]? Mgb equivalent width in Å (3)
142-146 F5.3 0.1nm WMgFe [0/4.2]? [MgFe] equivalent width in Å (3)
148-153 F6.3 Gyr Age [0.4/61.8]? Age from the stellar population
model (4)
155-160 F6.3 --- [Z/H] [-2.4/3.9]? [Z/H] from the stellar population
model (4)
162-167 F6.3 --- [a/Fe] [-8.3/92]? [α/Fe] from the stellar
population model (4)
169 I1 --- Cl [0/5]? BPT class (5)
171-175 F5.3 [Msun] logMBH [2.6/9.3]? Black hole mass (6)
177-182 F6.3 0.1nm WHa [0/99.1]? Hα equivalent width in Å
for non-AGNs (7)
184-185 I2 --- Nd [0/26] Number of companion galaxies within
1Mpc in three dimensional space (8)
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Note (1): E0-E5: 10-15, S0: 16, Sa-Sd: 21-24, SBa-SBd: 31-34, Irr: 40,
unknown: 50
Note (2): Blank values when a galaxy does not satisfy 10<σeff<400km/s
Note (3): Blank values when a galaxy does not satisfy S/N>3 and Nσ<2.
Note (4): Properties derived from the stellar population model, valid for
statistical studies like Figures 14-16, but may differ more
significantly for galaxies on a one-to-one basis.
A blank value is assigned when a galaxy does not satisfy S/N>3 and
Nσ<2.
Note (5): BPT class as follows:
0 = weak-emission,
1 = star-forming,
2 = composite,
3 = Seyfert,
4 = LINER,
5 = unclear
Note (6): A blank value is assigned when σeff is blank.
Note (7): A blank value is assigned for AGN host galaxies or negative values.
Note (8): Density: 0 indicates isolated galaxies and
≥2 means comparison galaxies.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 26-Oct-2015