J/AJ/141/88 Galaxy cluster environments of radio sources (Wing+, 2011)
Galaxy cluster environments of radio sources.
Wing J.D., Blanton E.L.
<Astron. J., 141, 88 (2011)>
=2011AJ....141...88W 2011AJ....141...88W
ADC_Keywords: Clusters, galaxy ; Radio sources ; Photometry, SDSS
Keywords: galaxies: clusters: general - galaxies: groups: general -
radio continuum: galaxies
Abstract:
Using the Sloan Digital Sky Survey (SDSS) and the Faint Images of the
Radio Sky at Twenty Centimeters (FIRST) catalogs, we examined the
optical environments around double-lobed radio sources. Previous
studies have shown that multi-component radio sources exhibiting some
degree of bending between components are likely to be found in galaxy
clusters. Often this radio emission is associated with a cD-type
galaxy at the center of a cluster. We cross-correlated the SDSS and
FIRST catalogs and measured the richness of the cluster environments
surrounding both bent and straight multi-component radio sources. This
led to the discovery and classification of a large number of galaxy
clusters out to a redshift of z∼0.5.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 108 384 All extended sources with N-191.0≥40
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See also:
VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
http://www.sdss.rg : SDSS Home Page
Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- [WB2011] Source name (JHHMMSS.s+DDMMSS)
18 A1 --- S [VAS] Sample source belongs to (1)
20- 21 I2 h RAh Hour of Right Ascension (J2000)
23- 24 I2 min RAm Minute of Right Ascension (J2000)
26- 30 F5.2 s RAs Second of Right Ascension (J2000)
32 A1 --- DE- Sign of the Declination (J2000)
33- 34 I2 deg DEd Degree of Declination (J2000)
36- 37 I2 arcmin DEm Arcminute of Declination (J2000)
39- 42 F4.1 arcsec DEs Arcsecond of Declination (J2000)
44- 48 F5.2 mag rmag0 Apparent SDSS dereddened r band magnitude
50- 55 F6.2 mag rMAG Absolute SDSS r band magnitude
57- 61 F5.1 mJy S1440 Total 1440MHz flux density
63- 67 F5.1 deg theta Radio source opening angle θ
69- 76 A8 W/Hz P1440 Total 1440MHz power
78- 79 A2 --- FR1 Ledlow & Owen (1996AJ....112....9L 1996AJ....112....9L) FR type
81- 83 A3 --- FR2 FR type determined visually
85- 89 F5.3 --- z Redshift
91 A1 --- f_z [ab] Redshift type (a=spectro) (2)
93- 95 I3 --- N Richness measurement N-191.0 (3)
97-100 F4.2 --- fc Schechter correction factor
102-106 A5 --- Abell Abell source identification (4)
108 A1 --- f_Abell [cd] Flag on Abell association (5)
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Note (1): Sample source as follows:
V = the visual bent sample
A = the auto bent sample
S = the straight sample
Note (2): Flag on z as follows:
a = The redshift comes from a spectroscopic measurement
b = The redshift comes from a photometric measurement
Note (3): The richness measurement, N-191.0 corresponds to counting all
galaxies within a 1.0Mpc radius of the radio source with absolute
magnitudes brighter than MV=-19.
Note (4): Located within 3Mpc (projected) of radio source.
Note (5): Flag on Abell as follows:
c = The difference in redshift between the identified Abell cluster
(from NED) and the radio cluster is greater than 1500km/s.
d = The Abell cluster does not have a confirmed redshift in NED.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 28-Jul-2012