J/ApJS/244/3 Linear structural param. of SDSS+UKIDSS+WISE gal. (Devour+, 2019)
Circumventing the effects of projection and dust using inclination-independent
infrared galaxy structure measurements: method, error analysis, and a new public
catalog of near-infrared galaxy structures.
Devour B.M., Bell E.F.
<Astrophys. J. Suppl. Ser., 244, 3 (2019)>
=2019ApJS..244....3D 2019ApJS..244....3D
ADC_Keywords: Galaxy catalogs; Photometry, infrared; Photometry, SDSS;
Redshifts; Magnitudes, absolute
Keywords: Galaxies; Galaxy photometry; Interstellar dust extinction;
Galaxy structure
Abstract:
Accurate measurements of galaxy structure are prerequisites for
quantitative investigation of galaxy properties or evolution. Yet
galaxy inclination, through projection and varying dust effects,
strongly affects many commonly used metrics of galaxy structure. Here
we demonstrate that collapsing a galaxy's light distribution onto its
major axis gives a "linear brightness profile" that is unaffected by
projection. In analogy to widely used half-light radius and
concentrations, we use two metrics to describe this light
distribution: x50, the linear distance containing half of the
galaxy's luminosity, and cx=x90/x50, the ratio between the 90%
light distance and the 50% light distance. In order to minimize the
effects of dust, we apply this technique to a diverse sample of
galaxies with moderately deep and high-resolution K-band imaging from
the UKIDSS Large Area Survey. Using simulated galaxy images, we find
that while our measurements are primarily limited by the surface
brightness in the outer parts of galaxies, most local galaxies have
high enough surface brightnesses to result in reliable measurements.
When applied to real data, our metrics vary from face-on to edge-on by
typically ∼5% in cx and ∼12% in x50, representing factors of
several to 10 improvement over existing optical and some infrared
catalog measures of galaxy structure. We release a sample of 23804
galaxies with inclination-independent and dust-penetrated
observational proxies for stellar mass, specific star formation rate,
half-light size, and concentration.
Description:
We measure the linear structural parameters and uncertainties for the
25022 galaxies in our combined SDSS+UKIDSS+WISE crossmatched sample.
Of these galaxies, a total of 23804 have structural parameters
successfully measured by our pipeline.
In addition to the inclination-dependent linear structural parameters
that are the main focus of this paper, we have compiled a wider range
of metrics of galaxy properties to enable study of how galaxy
properties depend on inclination and dust. In Tables 3 and 4,
described in the Appendix, two companion catalogs are provided, simply
as a convenience.
Where applicable, we assume a standard cosmology with ΩM=0.3,
ΩΛ=0.7, and H0=70km/s/Mpc.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 91 23804 Inclination-independent linear structural
parameter catalog format
table3.dat 101 23804 Companion catalog 1: Inclination-independent
galaxy property companion catalog
table4.dat 139 23804 Companion catalog 2: Ancillary
galaxy property companion catalog
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See also:
II/314 : UKIDSS-DR8 LAS, GCS and DXS Surveys (Lawrence+ 2012)
II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)
II/328 : AllWISE Data Release (Cutri+ 2013)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
J/ApJS/147/1 : Classification of nearby galaxies (Conselice+, 2003)
J/AJ/128/163 : Galaxy morphological classification (Lotz+, 2004)
J/ApJS/172/615 : GALFIT result for GEMS galaxies (Haussler+, 2007)
J/ApJS/196/11 : Bulge+disk decompositions of SDSS galaxies (Simard+, 2011)
J/A+A/553/A80 : Dust effects on photometric param. in spirals (Pastrav+, 2013)
J/A+A/557/A137 : Dust effects on photometric param. in spirals (Pastrav+ 2013)
J/ApJS/225/27 : 3D-HST Survey: grism spectra master catalog (Momcheva+, 2016)
http://www.sdss.org/ : SDSS home page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 20 A20 --- objID SDSS DR10 Object ID
22- 33 F12.8 deg RAdeg SDSS Right Ascension, decimal degrees (J2000)
35- 46 F12.8 deg DEdeg SDSS Declination, decimal degrees (J2000)
48- 53 F6.3 kpc x50 [0.002/62.7] Linear half-light radius
55- 60 F6.3 % e_x50 [0.01/1] Relative uncertainty in x50
62- 67 F6.3 kpc x90 [0.007/99]?=99.999 Linear 90% light radius
69- 74 F6.3 % e_x90 [0.01/0.8] Relative uncertainty in x90
76- 81 F6.3 --- cx [1.1/9.4] Linear concentration, cx≡x90/x50
83- 88 F6.3 --- e_cx [0.02/0.3] Relative uncertainty in cx
90- 91 I2 --- Flag [0/6] Fit quality flag (1)
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Note (1): bitwise flag, values code as follows. If multiple cases apply,
values sum to produce final flag value. Example: flag value of 3 = galaxy
was both mis-centered and possibly contaminated. Bit values include --
0 = no flag;
1 = mis-centered by at least 0.5 px, corrected;
2 = asymmetric/possibly contaminated, lower flux side used;
4 = centering fit failed to converge, likely unreliable.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 20 A20 --- objID SDSS DR10 Object ID
22- 33 F12.8 deg RAdeg SDSS Right Ascension, decimal degrees (J2000)
35- 46 F12.8 deg DEdeg SDSS Declination, decimal degrees (J2000)
48- 57 F10.6 mag W1Mag [-26.3/-4.7] WISE W1-band (3.4um) absolute magnitude
59- 68 F10.6 mag W2Mag [-25.7/-4] WISE W2-band (4.6um) absolute magnitude
70- 79 F10.6 mag W3Mag [-29.3/-4.4] WISE W3-band (12um) absolute magnitude
81- 90 F10.6 mag W3-W1 [-3.3/8.8] WISE W3-W1 color index
92-101 F10.6 mag Kmag [-29.2/-7.6] UKIDSS K-band (2.2um) absolute
magnitude
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 20 A20 --- objID SDSS DR10 Object ID
22- 33 F12.8 deg RAdeg SDSS Right Ascension, decimal degrees (J2000)
35- 46 F12.8 deg DEdeg SDSS Declination, decimal degrees (J2000)
48- 53 F6.2 mag uMag [-26.3/-4.4] SDSS u-band absolute magnitude
55- 60 F6.2 mag gMag [-27.5/-5.6] SDSS g-band absolute magnitude
62- 67 F6.2 mag rMag [-28.1/-6.1] SDSS r-band absolute magnitude
69- 74 F6.2 mag iMag [-28/-6.2] SDSS i-band absolute magnitude
76- 81 F6.2 mag zMag [-28.3/-6.3] SDSS z-band absolute magnitude
83- 87 F5.2 arcsec r-pet [1.4/68.4]?=99.99 SDSS r-band Petrosian radius
89- 93 F5.2 arcsec r-50 [0.7/25] SDSS r-band Petrosian half-light radius
95- 99 F5.2 arcsec r-90 [1.3/67] SDSS r-band Petrosian 90% light radius
101-105 F5.2 --- c [1.5/6.7] SDSS r-band concentration,
c≡r-90/r-50
107-111 F5.3 % f-dev [0/1] SDSS r-band de Vaucouleurs profile
fit fraction
113-118 F6.4 --- ab [0.08/1]?=9.9999 SDSS-derived optical
g+r band fit axis ratio (1)
120-123 F4.2 --- BT [0/1]?=9.99 SDSS-derived r-band
bulge-to-total ratio (1)
125-130 F6.4 --- z [0/0.8] SDSS redshift
132-139 F8.3 kpc Dist [0.1/4799] Adopted distance
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Note (1): Simard+ 2011, J/ApJS/196/11 --Table 1.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 27-Dec-2019