J/ApJS/229/20 MMT/Hectospec redshift survey for Abell 2029 (Sohn+, 2017)
The velocity dispersion function of very massive galaxy clusters:
Abell 2029 and Coma.
Sohn J., Geller M.J., Zahid H.J., Fabricant D.G., Diaferio A., Rines K.J.
<Astrophys. J. Suppl. Ser., 229, 20-20 (2017)>
=2017ApJS..229...20S 2017ApJS..229...20S (SIMBAD/NED BibCode)
ADC_Keywords: Redshifts ; Velocity dispersion ; Clusters, galaxy
Keywords: galaxies: clusters: individual: (Coma, Abell 2029);
galaxies: distances and redshifts; galaxies: fundamental parameters;
galaxies: luminosity function, mass function
Abstract:
Based on an extensive redshift survey for galaxy clusters Abell 2029
and Coma, we measure the luminosity functions (LFs) and stellar mass
functions (SMFs) for the entire cluster member galaxies. Most
importantly, we measure the velocity dispersion functions (VDFs) for
quiescent members. The MMT/Hectospec redshift survey for galaxies in
A2029 identifies 982 spectroscopic members; for 838 members, we derive
the central velocity dispersion from the spectroscopy. Coma is the
only other cluster surveyed as densely. The LFs, SMFs, and VDFs for
A2029 and Coma are essentially identical. The SMFs of the clusters are
consistent with simulations. The A2029 and Coma VDFs for quiescent
galaxies have a significantly steeper slope than those of field
galaxies for velocity dispersion 100km/s. The cluster VDFs also exceed
the field at velocity dispersion 250km/s. The differences between
cluster and field VDFs are potentially important tests of simulations
and of the formation of structure in the universe.
Description:
We carried out our redshift survey of A2029 using MMT/Hectospec
between April and June 2016 (wavelength range 3700-9150Å with a
resolution of 6.2Å).
Objects:
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RA (ICRS) DE Designation(s) (z)
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15 10 57.2 +05 45 16 A2029 = ACO 2029 (z=0.0784)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 55 982 A2029 spectroscopic members
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See also:
J/ApJ/819/63 : Hectospec survey of SZ clusters (HeCS-SZ) (Rines+, 2016)
J/ApJ/797/106 : Redshifts in nine galaxy cluster fields (Hwang+, 2014)
J/ApJS/213/35 : SHELS: complete R≤20.6 galaxy redshift survey (Geller+, 2014)
J/ApJ/773/86 : Star-forming galaxies in ACO 2029 (Tyler+, 2013)
J/ApJ/767/15 : Hectospec Cluster Survey (HeCS) (Rines+, 2013)
J/AJ/135/1837 : Spectroscopy in A2199 and Virgo clusters (Rines+, 2008)
J/A+A/444/365 : ESO Distant Cluster Survey, EDisCS (White+, 2005)
http://www.sdss3.org/ : SDSS-III home page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
12- 21 F10.6 deg DEdeg Declination in decimal degrees (J2000)
23- 27 I5 km/s cz [20452/26670] Spectroscopic redshift
29- 33 I5 km/s e_cz [1/299] Uncertainty in cz
35- 37 I3 km/s sigma [6/945]?=-99 Central velocity dispersion
within a rest-frame 3kpc aperture
39- 41 I3 km/s e_sigma [0/962]? Uncertainty in sigma
42 A1 --- f_sigma [*] *: uncertainty is not available for sigma
44- 49 F6.2 --- dn4000 [0.1/4.3]?=-99 Dn4000 index (1)
52- 55 A4 --- r_cz Reference for cz (2)
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Note (1): We calculate the index by taking the flux (measured per unit
frequency) in the interval 4000-4100Å relative to the flux in
the interval 3850-3950Å. See section 2.1.5.
Note (2): Reference as follows:
SDSS = from SDSS and BOSS;
T13 = from Tyler et al. (2013, J/ApJ/773/86);
MMT = from the MMT/Hectospec observation for this study.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 14-Jun-2017