J/AJ/126/2152 Cluster And Infall Region Nearby Survey. I (Rines+, 2003)
CAIRNS: the Cluster And Infall Region Nearby Survey.
I. Redshifts and mass profiles.
Rines K., Geller M.J., Kurtz M.J., Diaferio A.
<Astron. J., 126, 2152-2170 (2003)>
=2003AJ....126.2152R 2003AJ....126.2152R
ADC_Keywords: Clusters, galaxy ; Redshifts
Keywords: cosmology: observations - galaxies: clusters: general -
galaxies: kinematics and dynamics
Abstract:
The CAIRNS (Cluster and Infall Region Nearby Survey) project is a
spectroscopic survey of the infall regions surrounding eight nearby,
rich, X-ray-luminous clusters of galaxies. We have collected 15654
redshifts (3471 new or remeasured) within ∼5-10h-1Mpc of the centers
of the clusters, making it the largest study of the infall regions of
clusters. We determine cluster membership and the mass profiles of the
clusters based on the phase-space distribution of the galaxies. All of
the clusters display decreasing velocity dispersion profiles. The mass
profiles are fitted well by functional forms based on numerical
simulations but exclude an isothermal sphere. Specifically, Navarro et
al. (1997ApJ...490..493N 1997ApJ...490..493N) and Hernquist (1990ApJ...356..359H 1990ApJ...356..359H) models
provide good descriptions of cluster mass profiles to their turnaround
radii. Our sample shows that the predicted infall pattern is
ubiquitous in rich, X-ray-luminous clusters over a large mass range.
The caustic mass estimates are in excellent agreement with independent
X-ray estimates at small radii and with virial estimates at
intermediate radii. The mean ratio of the caustic mass to the X-ray
mass is 1.03±0.11, and the mean ratio of the caustic mass to the
virial mass (when corrected for the surface pressure term) is
0.93±0.07. We further demonstrate that the caustic technique
provides reasonable mass estimates even in merging clusters.
Description:
We have collected 15654 redshifts within a radius of ∼10h-1Mpc of
the eight clusters in the CAIRNS sample. Of this total, 3471 are new
or remeasured, and 1621 were published in Rines et al. (2000,
Cat. J/AJ/120/2338) and Rines et al. (2002, Cat. J/AJ/124/1266).
New and remeasured redshifts were obtained with the FAST spectrograph
on the 1.5m Tillinghast telescope of the Fred Lawrence Whipple
Observatory (FLWO).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 55 9 CAIRNS basic properties
table3.dat 43 5056 Spectroscopic Data for A119 and A168
table4.dat 43 6904 Spectroscopic Data for A194
table5.dat 42 1043 Spectroscopic Data for A496
table6.dat 42 784 Spectroscopic Data for A539
table7.dat 43 1849 Spectroscopic Data for A1367
table8.dat 42 4160 Spectroscopic Data for Coma
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See also:
J/AJ/120/2338 : Abell 576 redshifts (Rines+, 2000)
J/AJ/124/1266 : Redshift survey around Abell 2199 (Rines+, 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Cluster Cluster number
9- 10 I2 h RAh X-ray Rigth ascension (J2000.0)
12- 13 I2 min RAm X-ray Rigth ascension (J2000.0)
15- 18 F4.1 s RAs X-ray Rigth ascension (J2000.0)
21 A1 --- DE- X-ray Declination sign (J2000.0)
22- 23 I2 deg DEd X-ray Declination (J2000.0)
25- 26 I2 arcmin DEm X-ray Declination (J2000.0)
28- 29 I2 arcsec DEs X-ray Declination (J2000.0)
31- 35 I5 km/s cz Heliocentric redshift
37- 40 I4 km/s sigmap(3s) 3σ velocity dispersion
42- 44 I3 km/s sigmap(ca) Caustics velocity dispersion
46- 49 F4.1 10+36W LX X-ray luminosity (10+43erg/s)
51- 53 F3.1 keV TX X-ray temperature
55 I1 --- R Abell richness class
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Byte-by-byte Description of file: table[3-8].dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Hour of right ascension (J2000)
4- 5 I2 min RAm Minute of right ascension (J2000)
7- 11 F5.2 s RAs Second of right ascension (J2000)
13 A1 --- DE- Sign of the declination (J2000)
14- 15 I2 deg DEd Degree of declination (J2000)
17- 18 I2 arcmin DEm Arcminute of declination (J2000)
20- 23 F4.1 arcsec DEs Arcsecond of declination (J2000)
25- 29 I5 km/s cz Redshift
31- 35 I5 km/s e_cz ?=0 Error in cz
37 I1 --- r_cz [1/2] Redshift reference (1)
39- 43 A5 --- Cluster Abell cluster name, or "Both"
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Note (1): Redshift reference:
1 = FAST spectra;
2 = NED; the error e_cz is set to zero when not known.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 12-Jan-2004