J/ApJ/862/172 HeCS-red: Hectospec surveys of redMaPPer clusters (Rines+, 2018)
HeCS-red: dense Hectospec Surveys of redMaPPer-selected clusters.
Rines K.J., Geller M.J., Diaferio A., Hwang Ho S., Sohn J.
<Astrophys. J., 862, 172 (2018)>
=2018ApJ...862..172R 2018ApJ...862..172R
ADC_Keywords: Clusters, galaxy; Spectra, optical; Redshifts;
Velocity dispersion; Surveys
Keywords: cosmology: observations ; galaxies: clusters: general ;
galaxies: distances and redshifts ; galaxies: kinematics and dynamics
Abstract:
We use dense redshift surveys to explore the properties of galaxy
clusters selected from the redMaPPer catalog. Our new survey,
Hectospec Cluster Survey of red-sequence-selected clusters (HeCS-red),
includes 10589 new or remeasured redshifts from MMT/Hectospec
observations of 27 redMaPPer clusters at redshifts z=0.08-0.25 with
large estimated richnesses (richness estimate λ>64). Our
spectra confirm that each candidate cluster corresponds to a large
overdensity in redshift space. The redMaPPer photometric redshifts
have a slight bias toward higher redshifts. We measure the relation
between velocity dispersion σp and λ. The relation shows
intrinsic scatter of 24% (and a range of 2x) in velocity dispersion at
fixed richness. We extend our analysis to HeCS-red-ext, a sample that
includes several clusters selected by X-ray flux or Sunyaev-Zeldovich
signal. The heterogeneous sample of 121 clusters in HeCS-red-ext shows
similar intrinsic scatter in the σp-λ relation as the
HeCS-red sample, but the range of σp at fixed richness increases
to 3x. We evaluate the membership probability estimates Pmem for
individual galaxies provided by redMaPPer. The spectroscopic
membership fraction is larger than Pmem for 0.05≤Pmem≤0.7;
conversely, the spectroscopic membership fraction is smaller than
Pmem at Pmem≥0.8. We compare spectroscopic richness estimates
with redMaPPer richness estimates and find good agreement on average,
but a range of a factor of two in spectroscopic richness at fixed
redMaPPer richness. Overall, within the high-richness and low-redshift
cut of our sample, spectroscopically estimated parameters such as
velocity dispersion correlate well with photometric richness
estimates, although the relations contain substantial scatter.
Description:
The new observations presented here consist of optical spectroscopy
acquired with the Hectospec instrument on the MMT 6.5m telescope.
Hectospec provides simultaneous spectroscopy of up to 300 objects
across a diameter of 1°.
In addition to the new spectra, we use extensive data from previous
Hectospec cluster surveys (Rines+ 2013, J/ApJ/767/15 and
2016, J/ApJ/819/63), as well as from SDSS and NED.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 49 10589 HeCS-red redshifts from MMT/Hectospec
table2.dat 39 393 HeCS-red members from literature redshifts
table3.dat 113 29 Dynamical mass and richness estimates
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See also:
II/267 : The SDSS Photometric Catalog, Release 4 (Adelman-McCarthy+, 2006)
VIII/91 : Planck Catalog of Compact Sources Release 1 (Planck, 2013)
J/ApJ/471/694 : Abell 2390 Gunn photometry & equivalent widths (Abraham+ 1996)
J/ApJ/511/65 : Einstein images of galaxy clusters (Jones & Forman, 1999)
J/AJ/126/2152 : Cluster And Infall Region Nearby Survey. I (Rines+, 2003)
J/A+A/425/367 : REFLEX Galaxy Cluster Survey catalogue (Boehringer+, 2004)
J/ApJS/157/1 : Red-Sequence Cluster Survey (Gladders+, 2005)
J/AJ/132/1275 : CIRS (Cluster Infall Regions in the SDSS). I. (Rines+, 2006)
J/A+A/467/37 : Velocities of galaxies in A773 (Barrena+, 2007)
J/A+A/469/861 : Radial velocities of A115 galaxies (Barrena+, 2007)
J/ApJ/767/15 : Hectospec Cluster Survey (HeCS) (Rines+, 2013)
J/ApJ/783/52 : Redshifts in the field of A383 (Geller+, 2014)
J/ApJ/797/106 : Redshifts in nine galaxy cluster fields (Hwang+, 2014)
J/ApJ/797/82 : Brightest cluster galaxies in Abell clusters (Lauer+, 2014)
J/ApJ/785/104 : redMaPPer. I. Algorithm applied to SDSS DR8 (Rykoff+, 2014)
J/ApJ/819/63 : Hectospec survey of SZ clusters (HeCS-SZ) (Rines+, 2016)
J/ApJS/224/1 : redMaPPer cluster catalog from DES data (Rykoff+, 2016)
J/ApJ/856/172 : The HectoMAP cluster survey. I. (Sohn+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension, decimal degrees (J2000)
11- 18 F8.5 deg DEdeg Declination, decimal degrees (J2000)
20- 20 A1 --- FFlag [F ] Fiber flag (1)
22- 30 F9.6 --- zspec [-0.002/3.9] MMT/Hectospec spectroscopic redshift
32- 39 F8.6 --- e_zspec [1.3e-5/0.002] Uncertainty in zspec
41- 45 F5.2 --- RXC [1/36] Cross-correlation score (2)
47- 47 A1 --- q_zspec [QX?] Redshift flag (Q=unambiguous redshift) (3)
49- 49 I1 --- Mm [0/1] Member
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Note (1):
F = The spectrum for this fiber contains two highly likely redshift
solutions. The spectrum is likely a superposition of two galaxies
located very close together on the sky and not resolved in SDSS imaging.
Note (2): Cross-correlation score RXC from the IRAF package rvsao
(Kurtz & Mink 1998PASP..110..934K 1998PASP..110..934K). A score of RXC>3 indicates a reliable
redshift.
Note (3): The results of visual inspection are listed as a Flag with possible
values as follows:
Q = unambiguous redshift (10009 occurrences);
? = medium-confidence redshift (452 occurrences);
X = low-confidence redshift (128 occurrences).
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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- 9 F9.5 deg RAdeg Right Ascension, decimal degrees (J2000)
11- 18 F8.5 deg DEdeg Declination, decimal degrees (J2000)
20- 27 F8.6 --- zspec [0.12/0.3] Literature spectroscopic redshift
29- 36 F8.6 --- e_zspec [3e-6/0.001] Uncertainty in zspec
38- 39 I2 --- r_zspec [1/2] Redshift reference (1=SDSS or 2=NED)
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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- 20 A20 --- Cluster Cluster
22- 30 F9.5 deg RAdeg Right Ascension, decimal degrees (J2000)
32- 39 F8.5 deg DEdeg Declination, decimal degrees (J2000)
41- 46 F6.4 --- zspec [0.1/0.3] Spectroscopic redshift (1)
48- 51 I4 km/s dVp [482/1278] Velocity dispersion (1)
53- 55 I3 km/s E_dVp [47/125] Upper uncertainty in dVp (1)
57- 58 I2 km/s e_dVp [38/88] Lower uncertainty in dVp (1)
60- 64 F5.2 10+14Msun M200c [0.8/12.1] Dynamical mass inside of R200
from the caustic mass profile
66- 69 F4.2 10+14Msun e_M200c [0.02/1.3] Uncertainty in M200c
71- 75 F5.1 --- lambda [64/149.3] redMaPPer richness parameter
77- 79 F3.1 --- e_lambda [2.5/6.1] Uncertainty in lambda
81- 92 A12 --- Survey Spectra source (2)
94- 95 A2 --- --- [RM]
96-113 A18 --- RM redMaPPer identifier (JHHMMSS.s+DDMMSS.s)
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Note (1): Redshift z and velocity dispersion are computed for galaxies
defined as members using the caustics.
Note (2): Indicates whether the cluster is part of the following sample:
CIRS = Cluster Infall Regions in SDSS (CIRS) program (Rines & Diaferio
2006, J/AJ/132/1275);
HeCS = Hectospec Cluster Survey (Rines+ 2013, J/ApJ/767/15) a
spectroscopic survey of 58 galaxy clusters at moderate redshift
(z=0.1-0.3) with MMT/Hectospec. HeCS clusters were selected based
on X-ray flux.
HeCS-SZ = Hectospec Cluster Survey of SZ-selected clusters
(Rines+ 2016, J/ApJ/819/63) clusters with z<0.2 selected based on
integrated Compton parameter measurements from the Planck
satellite and photometry from SDSS DR10.
HeCS-red = new spectroscopic observations from this work of redMaPPer-selected
clusters exclusively.
HeCS-red-ext = extended sample which adds clusters selected based on their
X-ray or SZ properties.
See section 2 for further explanations.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 01-Aug-2019