J/ApJ/736/21 Galaxy clusters optical catalog from AMF on SDSS DR6 (Szabo+ 2011)
An optical catalog of galaxy clusters obtained from an adaptive matched filter
finder applied to Sloan Digital Sky Survey Data Release 6.
Szabo T., Pierpaoli E., Dong F., Pipino A., Gunn J.
<Astrophys. J., 736, 21 (2011)>
=2011ApJ...736...21S 2011ApJ...736...21S
ADC_Keywords: Clusters, galaxy ; Redshifts ; Photometry, SDSS
Keywords: galaxies: clusters: general - galaxies: distances and redshifts
Abstract:
We present a new cluster catalog extracted from the Sloan Digital Sky
Survey Data Release 6 (SDSS DR6) using an adaptive matched filter
(AMF) cluster finder. We identify 69,173 galaxy clusters in the
redshift range 0.045≤z<0.78 in 8420deg2 of the sky. We provide
angular position, redshift, richness, core, and virial radii estimates
for these clusters, as well as an error analysis for each of these
quantities. We also provide a catalog of more than 205,000 galaxies
representing the three brightest galaxies in the r band which are
possible brightest cluster galaxy (BCG) candidates. We show basic
properties of the BCG candidates and study how their luminosity scales
in redshift and cluster richness. We compare our catalog with the
maxBCG and GMBCG catalogs, as well as with that of Wen et al. We match
between 30% and 50% of clusters between catalogs over all overlapping
redshift ranges. We find that the percentage of matches increases with
the richness for all catalogs. We cross match the AMF catalog with
available X-ray data in the same area of the sky and find 539 matches,
119 of which with temperature measurements. We present scaling
relations between optical and X-ray properties and cluster center
comparison.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
gccat.dat 186 69173 Catalog of galaxy clusters
bgccat.dat 255 205768 Catalog of brightest cluster galaxy candidates
errrange.dat 186 69173 Error ranges in richness, core radii, position
mg0916.dat 240 245248 Member galaxies for SDSS stripes 9-16
mg1724.dat 240 267021 Member galaxies for SDSS stripes 17-24
mg2530.dat 240 210132 Member galaxies for SDSS stripes 25-30
mg3137.dat 240 200735 Member galaxies for SDSS stripes 31-37
mg3839.dat 240 95321 Member galaxies for SDSS stripes 38 and 39
mg4244.dat 240 12241 Member galaxies for SDSS stripes 42-44
mg7686.dat 240 53911 Member galaxies for SDSS stripes 76, 82, and 86
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See also:
http://www.sdss.org : SDSS Home Page
J/ApJS/183/197 : Galaxy clusters identified from the SDSS-DR6 (Wen+, 2009)
J/ApJ/660/239 : MaxBCG catalog of 13823 galaxy clusters from SDSS
(Koester et al., 2007)
Byte-by-byte Description of file: gccat.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- Name.a [1/69173] Cluster identifier (1)
7 A1 --- --- [.]
8 I1 --- b [0/1] Cluster identifier, edge (1)
9 A1 --- --- [.]
10 I1 --- c Cluster identifier, redshift (1)
11 A1 --- --- [.]
12- 17 I06 --- Name.d Cluster identifier, richest (1)
21- 28 F8.4 deg RAdeg Right ascension in decimal degrees, J2000
32- 39 F8.4 deg DEdeg Declination in decimal degrees, J2000
43- 48 F6.4 --- zc Redshift of cluster
52- 59 F8.4 [---] log(L) log of likelihood value for cluster
63- 70 F8.4 --- L200 Λ200 richness of cluster (G2)
74- 78 F5.3 Mpc R200 Radius of 200*ρc of cluster
82- 86 F5.3 Mpc rc Core radius of cluster
90- 95 F6.3 --- cc Concentration index rc/R200 ratio
99-100 I2 --- Stripe [9/86] SDSS stripe in which cluster appears
106-114 F9.5 deg RA(mBCG) ?=- RA (J2000) of matching maxBCG cluster (3)
122-131 F10.6 deg DE(mBCG) ?=- Dec (J2000) of matching maxBCG cluster (3)
135-142 F8.6 --- z(mBCG) ?=- redshift of matching maxBCG cluster (3)
150-165 A16 --- WHL Identifier of matching WHL cluster (Wen et al.
2009, Cat. J/ApJS/183/197)
171-186 A16 --- Abell Identifier of matching Abell cluster (4)
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Note (1): The full identifier is of the form a.b.c.d where
* a is the cluster number, rank of the cluster in richness;
* b=1 for clusters on the edge or a stripe or b=0 otherwise;
* c=1 if the cluster has at least five members with spectroscopic
redshift data or c=0 otherwise;
* d=a if the cluster is unique to that site,
* d=0 if the cluster is the richest member of a blended site,
* d is equal to a of the richest cluster if the cluster is not the
richest cluster at a blended site, and
* d=999999 if no galaxies associated with the cluster have a
likelihood difference ≥ 1.
Note (3): MaxBCG catalog of 13823 galaxy clusters from SDSS by
Koester et al. 2007, Cat. J/ApJ/660/239.
Set to "-" if there is no unique match.
Note (4): Set to blank if there is no unique match.
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Byte-by-byte Description of file: bgccat.dat
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Bytes Format Units Label Explanations
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1- 7 F7.1 --- BCG BCG candidate identifier (1)
9- 26 A18 --- SDSS SDSS ID number (see casjobs.sdss.org)
33- 40 F8.4 deg RAdeg Right ascension in decimal degrees, J2000
45- 52 F8.4 deg DEdeg Declination in decimal degrees, J2000
57- 64 F8.5 mag k00 ?=- K-correction for z=0.0 (G1)
69- 76 F8.5 mag k03 ?=- K-correction for z=0.3 from Kcorrect v4.1.4
81- 88 F8.5 mag k05 ?=- K-correction for z=0.5 from Kcorrect v4.1.4
92-100 F9.5 mag umag ?=-99 Extinction corrected u-band apparent mag.
105-112 F8.5 mag gmag ?=-99 Extinction corrected g-band apparent mag.
117-124 F8.5 mag rmag ?=-99 Extinction corrected r-band apparent mag.
129-136 F8.5 mag imag ?=-99 Extinction corrected i-band apparent mag.
140-148 F9.5 mag zmag ?=-99 Extinction corrected z-band apparent mag.
152-160 F9.5 mag e_umag ?=-99 Error in model magnitude, u-band
165-172 F8.5 mag e_gmag ?=-99 Error in model magnitude, g-band
178-184 F7.5 mag e_rmag ?=-99 Error in model magnitude, r-band
189-196 F8.5 mag e_imag ?=-99 Error in model magnitude, i-band
200-208 F9.5 mag e_zmag ?=-99 Error in model magnitude, z-band
213-220 F8.5 --- zp ?=1 Photometric redshift
226-232 F7.5 --- zs ?=1 Spectroscopic redshift
236-243 F8.4 --- L200 Λ200 richness of host cluster (G2)
247-255 F9.5 mag rMAG ?=- Computed absolute r-band magnitude (3)
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Note (1): Identifier is of the form a.b where a is the richness rank of the
cluster, identical to Name.a from gccat.dat, and b is the rank of the
BCG candidate where 1 is the lowest r-band apparent magnitude for a
galaxy with a likelihood difference ≥1, 2 is the second lowest for a
galaxy with a likelihood difference ≥1,, and 3 is the third lowest
for a galaxy with a likelihood difference ≥1
Note (3): Absolute r-band magnitude of the galaxy computed at the redshift,
zc, of the host cluster including the specified k-corrections.
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Byte-by-byte Description of file: errrange.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- Name.a [1/69173] The rank of the cluster in richness,
as in gccat.dat.
11- 18 F8.4 --- bR3 Minimum value of richness, 3-σ range
23- 30 F8.4 --- bR1 Minimum value of richness, 1-σ range
35- 42 F8.4 --- BR1 Maximum value of richness, 1-σ range
47- 54 F8.4 --- BR3 Maximum value of richness, 3-σ range
59- 63 F5.3 Mpc brc3 Minimum value of core radius, 3-σ range
68- 72 F5.3 Mpc brc1 Minimum value of core radius, 1-σ range
77- 81 F5.3 Mpc Brc1 Maximum value of core radius, 1-σ range
86- 90 F5.3 Mpc Brc3 Maximum value of core radius, 3-σ range
95-102 F8.4 deg bRA3 J2000, minimum value of RA, 3-σ range
107-114 F8.4 deg bRA1 J2000, minimum value of RA, 1-σ range
119-126 F8.4 deg BRA1 J2000, maximum value of RA, 1-σ range
131-138 F8.4 deg BRA3 J2000, maximum value of RA, 3-σ range
143-150 F8.4 deg bDE3 J2000, minimum value of DEC, 3-σ range
155-162 F8.4 deg bDE1 J2000, minimum value of DEC, 1-σ range
167-174 F8.4 deg BDE1 J2000, maximum value of DEC, 1-σ range
179-186 F8.4 deg BDE3 J2000, maximum value of DEC, 3-σ range
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Byte-by-byte Description of file: mg_*.dat
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Bytes Format Units Label Explanations
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2- 6 I5 --- Name.a [1/69173] The rank of the cluster in richness
as in gccat.dat.
8- 25 A18 --- SDSS SDSS ID number (see casjobs.sdss.org)
29- 37 F9.5 deg RAdeg Right ascension in decimal degrees, J2000
41- 49 F9.5 deg DEdeg Declination in decimal degrees, J2000
52- 59 F8.5 mag k00 K-correction for z=0.0 (G1)
62- 69 F8.5 mag k03 K-correction for z=0.3 from Kcorrect v4.1.4
72- 79 F8.5 mag k05 K-correction for z=0.5 from Kcorrect v4.1.4
83- 91 F9.5 mag umag ?=-99.99999 Extinction corrected u-band apparent
magnitude
96-103 F8.5 mag gmag Extinction corrected g-band apparent magnitude
108-115 F8.5 mag rmag Extinction corrected r-band apparent magnitude
120-127 F8.5 mag imag Extinction corrected i-band apparent magnitude
131-139 F9.5 mag zmag ?=-99.99999 Extinction corrected z-band apparent
magnitude
142-150 F9.5 mag e_umag ?=-99.99999 Error in model magnitude, u-band
154-161 F8.5 mag e_gmag ?=-99 Error in model magnitude, g-band
166-172 F7.5 mag e_rmag ?=-99 Error in model magnitude, r-band
176-183 F8.5 mag e_imag ?=-99 Error in model magnitude, i-band
186-194 F9.5 mag e_zmag ?=-99.99999 Error in model magnitude, z-band
198-205 F8.5 --- zp ?=-1 Photometric redshift of galaxy
209-216 F8.5 --- e_zp ?=-1 Error in photometric redshift
221-227 F7.5 --- zs ?=1 Spectroscopic redshift of galaxy
232-240 F9.7 --- e_zs ?=1 Error in spectroscopic redshift
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Global notes:
Note (G1): K-correction computed at z=0.0, determined from Kcorrect v4.1.4
as referenced in Blanton & Roweis, 2007AJ....133..734B 2007AJ....133..734B
Note (G2): The richness is the total luminosity within R200 in terms of L*,
where L* evolves passively as a function of redshift, brightening by
0.8mag from z=0 to z=0.5 .
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Acknowledgements:
Thad Szabo, tszabo(at)usc.edu,
Elena Pierpaoli, pierpaol(at)usc.edu
(End) T. Szabo [Univ. of Southern California], P. Vannier [CDS] 08-Aug-2011