J/ApJ/767/15 Hectospec Cluster Survey (HeCS) (Rines+, 2013)
Measuring the ultimate halo mass of galaxy clusters: redshifts and mass profiles
from the Hectospec Cluster Survey (HeCS).
Rines K., Geller M.J., Diaferio A., Kurtz M.J.
<Astrophys. J., 767, 15 (2013)>
=2013ApJ...767...15R 2013ApJ...767...15R
ADC_Keywords: Clusters, galaxy ; X-ray sources ; Spectroscopy ; Redshifts ;
Surveys
Keywords: cosmology: observations; galaxies: clusters: general;
galaxies: kinematics and dynamics
Abstract:
The infall regions of galaxy clusters represent the largest
gravitationally bound structures in a ΛCDM universe. Measuring
cluster mass profiles into the infall regions provides an estimate of
the ultimate mass of these halos. We use the caustic technique to
measure cluster mass profiles from galaxy redshifts obtained with the
Hectospec Cluster Survey (HeCS), an extensive spectroscopic survey of
galaxy clusters with MMT/Hectospec. We survey 58 clusters selected by
X-ray flux at 0.1<z<0.3. The survey includes 22680 unique
MMT/Hectospec redshifts for individual galaxies; 10145 of these
galaxies are cluster members. For each cluster, we acquired high
signal-to-noise spectra for ∼200 cluster members and a comparable
number of foreground/background galaxies. The cluster members trace
out infall patterns around the clusters. The members define a very
narrow red sequence. We demonstrate that the determination of velocity
dispersion is insensitive to the inclusion of bluer members (a small
fraction of the cluster population). We apply the caustic technique to
define membership and estimate the mass profiles to large radii. The
ultimate halo mass of clusters (the mass that remains bound in the far
future of a ΛCDM universe) is on average (1.99±0.11)M200, a
new observational cosmological test in essential agreement with
simulations. Summed profiles binned in M200 and in LXdemonstrate
that the predicted Navarro-Frenk-White form of the density profile is
a remarkably good representation of the data in agreement with weak
lensing results extending to large radius. The concentration of these
summed profiles is also consistent with theoretical predictions.
Description:
We obtained MMT/Hectospec spectroscopy of 400-550 candidate members
per cluster (for three clusters, we obtained more than 550 spectra).
Observations were conducted primarily between 2007 June and 2009
February with a total of 10 nights of queue time. We also observed one
additional Hectospec field in A2261 in 2011 May and seven additional
fields in RXJ2129 in 2011 September. We observed additional fields in
these clusters because they are part of the CLASH sample (Postman et
al. 2012, Cat. J/ApJS/199/25; Coe et al. 2012, Cat. J/ApJ/757/22).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 58 58 HeCS basic properties
table2.dat 47 22680 HeCS redshifts and membership classification
table3.dat 38 2621 HeCS members from literature redshifts
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See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
VII/110 : Rich Clusters of Galaxies (Abell+ 1989)
J/A+A/562/A86 : CLASH. Photometric + photo-z catalog (Jouvel+, 2014)
J/ApJS/199/25 : CLASH sources for MACS1149.6+2223 (Postman+, 2012)
J/A+A/535/A4 : X-ray galaxy clusters study (Reichert+, 2011)
J/ApJS/174/117 : Properties and metal abundances of clusters (Maughan+, 2008)
J/ApJ/665/921 : Redshift survey in the field of A1689 (Frye+, 2007)
J/MNRAS/376/1073 : Sunyaev-Zel'dovich effect in galaxy clusters (Zemcov+, 2007)
J/A+A/425/367 : REFLEX Galaxy Cluster Survey catalogue (Boehringer+, 2004)
J/A+A/416/839 : Radial velocities of A2219 galaxies (Boschin+, 2004)
J/MNRAS/318/333 : Extended ROSAT Bright Cluster Sample (Ebeling+ 2000)
J/MNRAS/301/881 : The ROSAT brightest cluster sample - I. (Ebeling+, 1998)
J/AJ/109/14 : Optical spectroscopy of Abell clusters. I. (Owen+ 1995)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name HeCS cluster name
9- 16 F8.4 deg RAdeg X-ray right ascension (J2000)
18- 24 F7.4 deg DEdeg X-ray declination (J2000)
26- 31 F6.4 --- z [0.1/0.3] Heliocentric redshift
33- 37 F5.2 10+36W LX [0.64/14.12]? rest-frame X-ray luminosities
(1043erg/s) (1)
39- 42 A4 --- Cat Catalog (BCS, REF or eBCS) (1)
44- 47 I4 km/s sig [404/1261] Projected velocity dispersion
(σp)
49- 51 I3 km/s E_sig [40/122] Positive error on sig
53- 54 I2 km/s e_sig [35/81] Negative error on sig
56- 58 I3 --- Nm [61/461] Number of members
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Note (1): X-ray luminosities are in the rest-frame ROSAT band and are from
BCS = Bright Cluster Survey; Ebeling et al. 1998, J/MNRAS/301/881
REF = REFLEX (ROSAT-ESO FLux-LimitEd X-ray cluster survey);
Bohringer et al. 2004, J/A+A/425/367)
eBCS = extended BCS; Ebeling et al. 2000, J/MNRAS/318/333.
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Byte-by-byte Description of file: table2.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- 12 F6.3 s RAs Second of Right Ascension (J2000)
14 A1 --- DE- Sign of the Declination (J2000)
15- 16 I2 deg DEd Degree of Declination (J2000)
18- 19 I2 arcmin DEm Arcminute of Declination (J2000)
21- 26 F6.3 arcsec DEs Arcsecond of Declination (J2000)
28- 33 I6 km/s cz [-304/216796] Heliocentric redshift
35- 37 I3 km/s e_cz [5/500] The 1σ error in cz
39- 43 F5.2 --- R [0/38] Cross-correlation score
45 A1 --- q_cz [Q?X] Quality flag, Q=secure (1)
47 I1 --- Np [0/2] Membership flag (0=non-member) (G1)
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Note (1): Quality flag as follows:
Q = high-quality spectrum, secure redshift;
? = medium-quality spectrum, secure redshift from multiple lines;
X = low-quality spectrum (poor fit to spectral template), medium-confidence
redshift from multiple lines.
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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- 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- 24 F5.2 arcsec DEs Arcsecond of Declination (J2000)
26- 30 I5 km/s cz [28954/86913] Heliocentric redshift
32- 34 I3 km/s e_cz [1/456] The 1σ error in cz
36 I1 --- r_cz Reference for cz (1)
38 I1 --- Np [1/2] Membership flag (0=non-member) (G1)
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Note (1): Reference as follows:
1 = SDSS-DR6 (Cat. II/282, superseded by II/294);
2 = Boschin et al. (2004, Cat. J/A+A/416/839).
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Global note:
Note (G1): Indicates the number of clusters for which this galaxy is
classified as a member.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 20-May-2014