J/MNRAS/425/2741 Parameters of Spiral galaxies from SDSS 7 (Hall+, 2012)
An investigation of Sloan Digital Sky Survey imaging data and multiband
scaling relations of spiral galaxies.
Hall M., Courteau S., Dutton A.A., McDonald M., Zhu Y.
<Mon. Not. R. Astron. Soc., 425, 2741-2765 (2012)>
=2012MNRAS.425.2741H 2012MNRAS.425.2741H
ADC_Keywords: Surveys ; Galaxies, photometry ; Photometry, SDSS
Keywords: surveys - galaxies: fundamental parameters -
galaxies: kinematics and dynamics - galaxies: photometry -
galaxies: spiral - galaxies: structure
Abstract:
We have compiled a sample of 3041 spiral galaxies with multiband gri
imaging from the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7;
Abazajian et al., 2009ApJS..182..543A 2009ApJS..182..543A) and available galaxy rotational
velocities, V, derived from HI linewidths. We compare the data
products provided through the SDSS imaging pipeline with our own
photometry of the SDSS images, and use the velocities, V, as an
independent metric to determine ideal galaxy sizes (R) and
luminosities (L). Our radial and luminosity parameters improve upon
the SDSS DR7 Petrosian radii and luminosities through the use of
isophotal fits to the galaxy images. This improvement is gauged via
VL (Vmag-Luminosity) and RV relations whose respective scatters are
reduced by ∼8 and ∼30% with our parameters compared to similar
relations built with SDSS parameters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 129 3041 Table of i-band galaxy parameters
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See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [AGC/UGC]
5- 10 I6 --- ID UGC(<20000) or AGC(>100000) designation
12- 15 F4.1 deg i Corrected galaxy inclination (8)
17- 21 I5 km/s Vcmb recession velocity of the galaxy relative to
the CMB frame (1)
23- 27 F5.1 km/s Vrot Corrected rotational velocity (2)
29- 30 I2 --- TT [-6/20] RC3 morphological type
32- 37 F6.2 arcsec Re Half-light radius based on the total
extrapolated i-band luminosity of the galaxy
39- 44 F6.2 arcsec R23.5 Radius at the i-band 23.5mag/arcsec2
isophote
46- 50 F5.2 arcsec Rd Disc scalelength of the galaxy
52- 56 F5.2 mag mext Total apparent i-band magnitude of the galaxy
including the extra light from the disc
extrapolation to infinity
58- 62 F5.2 mag m23.5 Apparent magnitude within the i-band
23.5mag/arcsec2 isophote
64- 69 F6.2 mag m2.2 ?=-99.99 Apparent magnitude within 2.2Rd of
the surface brightness profile (3)
71- 75 F5.2 mag/arcsec2 mu0 Corrected central surface brightness
77- 81 F5.2 mag/arcsec2 mue Corrected effective surface brightness
83- 88 F6.2 mag g-r ?=-99.99 Colour of the galaxy calculated from
the difference of extrapolated magnitudes
gext-rext
90- 95 F6.2 mag g-i ?=-99.99 Colour of the galaxy calculated from
the difference of extrapolated magnitudes
gext-iext
97-102 F6.2 --- C28 ?=-99.99 Galaxy light concentration (4)
104-109 F6.2 [Msun] logMHI ?=-99.99 Neutral hydrogen gas mass, derived
by S05 from the corrected HI line flux
measurements
111-115 F5.2 [Msun] logM* Stellar mass of the galaxy (5)
117-122 F6.2 [Msun] logMb ?=-99.99 Baryonic mass of the galaxy (6)
124-129 F6.2 [Msun] logMt ?=-99.99 Total mass of the galaxy computed at
R=R23.5 (7)
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Note (1): As calculated by S07 (Springob et al., 2007, Cat. J/ApJS/172/599),
which supersede estimates of Vcmb by S05 (Springob et al., 2005,
Cat. VIII/77) in the case of multiple measurements.
Note (2): from the HI linewidth profiles measured at 50% (WF50) of the total
flux by S05 (Springob et al., 2005, VIII/77) and S07 (Springob et al., 2007,
J/ApJS/172/599), divided by 2. S05/S07 linewidths are corrected for
instrumental effects and redshift broadening. Vrot is corrected for the
inclination of the disc and distance but not for turbulent motion in the HI
gas. Therefore, Vrot=WF50/[2sini(1+Vhel/c)], where Vhel is the heliocentric
velocity of the galaxy. Sample D uses only rotational velocities from S07.
Note (3): Non-entries in this column are due to a failed disc extrapolation,
described in Section 'Comparison of luminosity measurements'.
Note (4): C28=5log(R80/R20), where R20 and R80 enclose 20 and 80% of the
extrapolated i-band light, respectively.
Note (5): from the extrapolated i-band luminosity Lcext,i times the stellar
mass-to-light ratio (M*/Li) prescription of Bell et al. (2003ApJS..149..289B 2003ApJS..149..289B)
with a Chabrier (2003PASP..115..763C 2003PASP..115..763C) IMF.
Note (6): Section 'The Baryonic Tully-Fisher Relation' discusses the sum of the
stellar, HI and gas masses to make up the total baryonic mas Mbar=M*+1.4MHI.
Note (7): according to MT(R)=2.33*105RVtot2/sin2(i)M_☉, where R is
the radius in kpc and Vrot is the observed rotation velocity in km/s.
Note (8): Computed from Eq.(5) cos(i)=sqrt[(1-e)2-q02)/(1-q02)],
e being the ellipticity and q0=0.13
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Aug-2013