J/ApJ/819/63 Hectospec survey of SZ clusters (HeCS-SZ) (Rines+, 2016)
HeCS-SZ: the Hectospec survey of Sunyaev-Zeldovich-selected clusters.
Rines K.J., Geller M.J., Diaferio A., Hwang H.S.
<Astrophys. J., 819, 63 (2016)>
=2016ApJ...819...63R 2016ApJ...819...63R (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Redshifts ; Spectroscopy ; Surveys
Keywords: cosmology: observations; galaxies: clusters: general;
galaxies: distances and redshifts; galaxies: kinematics and dynamics
Abstract:
We estimate cluster masses and velocity dispersions for 123 clusters
from optical spectroscopy to compare the Sunyaev-Zeldovich (SZ) mass
proxy and dynamical masses. Our new survey, HeCS-SZ (Hectospec Cluster
Survey of SZ-selected clusters), includes 7721 new or remeasured
redshifts from MMT/Hectospec observations of 21 SZ-selected clusters
at redshifts z=0.05-0.20. We supplement the Hectospec data with
spectra from the Sloan Digital Sky Survey (SDSS) and cluster data from
the Cluster Infall Regions in SDSS project and the Hectospec Cluster
Survey, our Hectospec survey of clusters selected by X-ray flux. We
measure the scaling relation between velocity dispersion and SZ mass
estimates from the integrated Compton parameter for an SZ-complete
sample of 83 clusters. The observed relation agrees very well with a
simple virial scaling from mass (based on SZ) to velocity dispersion.
The SZ mass estimates (calibrated with hydrostatic X-ray mass
estimates) are not significantly biased compared to dynamical mass
estimates under the assumption of small velocity bias of galaxies
compared to dark matter particles. Significant mass bias in SZ mass
estimates could relieve tension between cosmological results from
Planck SZ cluster counts and Planck CMB data. In principle, SZ mass
bias and velocity bias of galaxies could conspire to yield good
agreement, but the required velocity bias is
σgalaxy∼0.77σDM, outside the range of recent models of
velocity bias in the literature. More likely, SZ mass bias and
velocity bias are both small, and the tension between SZ cluster
counts and CMB data requires another explanation.
Description:
HeCS-SZ is an extension of the HeCS survey to include clusters that
enable the construction of an SZ-limited sample. We measured 7721 new
redshifts with MMT/Hectospec in 21 clusters selected from the Planck
SZ catalog (2014A&A...571A..20P 2014A&A...571A..20P; arXiv:1502.01597). We combine these
new measurements with the existing HeCS (Hectospec Cluster Survey;
Rines et al. 2013, J/ApJ/767/15) and CIRS (Cluster Infall Regions in
SDSS project; Rines & Diaferio 2006, J/AJ/132/1275) surveys and with
data from the literature to construct a total sample of 123 clusters.
We use SDSS photometry for all clusters.
The HeCS is a spectroscopic survey of 58 galaxy clusters at moderate
redshift (z=0.1-0.3) with MMT/Hectospec. HeCS includes all clusters
with ROSAT X-ray fluxes of f_X>5x10-12erg/s at [0.5-2.0]keV from
the Bright Cluster Survey (BCS; Ebeling et al. 1998, J/MNRAS/301/881)
or REFLEX survey (Bohringer et al. 2004, J/A+A/425/367) with optical
imaging in the sixth Data Release (DR6) of SDSS (Adelman-McCarthy et
al. 2008, II/282; superseded by II/294).
CIRS used spectroscopy from the fourth Data Release of SDSS.
Table 3 lists 168 redshifts measured with the FAST instrument on the
1.5m Tillinghast telescope at the Fred Lawrence Whipple Observatory.
The additional single-slit spectra from FAST reduce the incompleteness
of bright (SDSS r≲16.5) galaxies in the HeCS-SZ clusters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 47 7721 HeCS-SZ redshifts from MMT/Hectospec
table2.dat 39 11585 HeCS-SZ members from literature redshifts
table3.dat 45 168 HeCS-SZ redshifts from FLWO 1.5m/FAST
table4.dat 125 123 Dynamical masses and SZ signals of clusters
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See also:
VIII/91 : Planck Catalog of Compact Sources Release 1 (Planck, 2013)
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
J/A+A/580/A95 : Planck/AMI Sunyaev-Zel'dovich measurements (Perrott+, 2015)
J/A+A/575/A30 : HIFLUGCS XMM/Chandra cross-calibration (Schellenberger+, 2015)
J/ApJS/216/27 : Galaxy clusters discovered in the SPT-SZ survey (Bleem+, 2015)
J/ApJ/797/106 : Redshifts in nine galaxy cluster fields (Hwang+, 2014)
J/ApJ/774/23 : Chandra observations of SPT-SZ clusters (McDonald+, 2013)
J/ApJ/772/25 : Massive SZE clusters observations with ACT (Sifon+, 2013)
J/ApJ/767/15 : Hectospec Cluster Survey (HeCS) (Rines+, 2013)
J/A+A/536/A8 : Planck early results. VIII. ESZ sample. (Planck+, 2011)
J/A+A/534/A109 : MCXC Meta-Catalogue X-ray galaxy Clusters (Piffaretti+, 2011)
J/AJ/132/1275 : CIRS (Cluster Infall Regions in the SDSS). I. (Rines+, 2006)
J/A+A/425/367 : REFLEX Galaxy Cluster Survey catalogue (Boehringer+, 2004)
J/A+A/417/827 : Relativistic corrections to SZ effect (Itoh+, 2004)
J/AJ/126/2152 : Cluster And Infall Region Nearby Survey. I (Rines+, 2003)
J/ApJS/129/435 : NORAS galaxy cluster survey. I. (Bohringer+, 2000)
J/MNRAS/301/881 : The ROSAT brightest cluster sample - I. (Ebeling+, 1998)
Byte-by-byte Description of file: table[13].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 [-265/197184] Redshift
35- 37 I3 km/s e_cz [0/141035] Uncertainty in cz
39- 43 F5.2 --- RXC [0/59.5] Cross-correlation score
45 I1 --- Mm Member flag (0=non-member; 1=cluster member)
47 A1 --- Q Quality flag (only for table 1) (1)
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Note (1): Quality flag as follows:
Q = Very-high-confidence redshift;
? = High-confidence redshift;
X = Medium-confidence redshift.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
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 [4070/91344] Redshift
32- 37 I6 km/s e_cz [0/141035] Uncertainty in cz
39 I1 --- Ref [1/2] Reference code (1=SDSS; 2=NED)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- ID Cluster identifier
14- 22 F9.5 deg RAdeg Right Ascension in decimals degrees (J2000)
24- 32 F9.5 deg DEdeg Declination in decimals degrees (J2000)
34- 39 F6.4 --- z [0.02/0.3] Redshift (1)
41- 44 I4 km/s sigma [305/1261] Velocity dispersion (1)
46- 48 I3 km/s E_sigma [26/148] Upper uncertainty limit in sigma
50- 51 I2 km/s e_sigma [24/82] Lower uncertainty limit in sigma
53- 57 F5.2 10+14Msun M200c [0.4/12.4] Caustic mass
59- 62 F4.2 10+14Msun e_M200c [0/3] Uncertainty in M200c
64- 68 F5.2 10+14Msun MSZ [0.9/11.5] Planck Sunyaev-Zeldovich mass
proxy
70- 73 F4.2 10+14Msun E_MSZ [0.1/0.8] Upper uncertainty limit in MSZ
75- 78 F4.2 10+14Msun e_MSZ [0.1/0.8] Lower uncertainty limit in MSZ
80- 84 F5.3 10-5/Mpc2 YSZD2A [0.01/1.1] Integrated Compton parameter
86- 90 F5.3 10-5/Mpc2 E_YSZD2A [0.004/0.08] Upper uncertainty limit
in YSZD2A
92- 96 F5.3 10-5/Mpc2 e_YSZD2A [0.003/0.08] Lower uncertainty limit
in YSZD2A
98-104 A7 --- Sp Spectra origin identifier (2)
106-109 A4 --- --- [PSZ1]
110-123 A14 --- PSZ1 Planck Identifier (GLLL.ll+BB.bb)
125 I1 --- Set [1/2] Sample number (3)
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Note (1): Computed for galaxies defined as members using the caustics.
Note (2): Spectra origin as follows:
HeCS-SZ = Hectospec Cluster Survey of SZ-selected clusters survey;
HeCS = Hectospec Cluster Survey;
CIRS = Cluster Infall Regions in SDSS project.
Note (3): Sample as follows:
1 = the SZ-complete Sample: clusters at z<0.3 with SZ detections above the
Planck completeness limit (Section 2.2) and Galactic latitude
|b|>20° that also satisfy other criteria described in section 2.1.2.
2 = Extended set of clusters: includes all Sample 1 clusters plus clusters
that lie below the Planck completeness limits. Sample 2 includes new
MMT/Hectospec data for five clusters in the Planck-SZ catalog.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 19-May-2016