J/ApJ/878/55 SPT-SZ clusters with optical & X-ray data (Bocquet+, 2019)
Cluster cosmology constraints from the 2500deg2 SPT-SZ survey: inclusion of
weak gravitational lensing data from Magellan and the Hubble Space Telescope.
Bocquet S., Dietrich J.P., Schrabback T., Bleem L.E., Klein M., Allen S.W.,
Applegate D.E., Ashby M.L.N., Bautz M., Bayliss M., Benson B.A., Brodwin M.,
Bulbul E., Canning R.E.A., Capasso R., Carlstrom J.E., Chang C.L., Chiu I.,
Cho H.-M., Clocchiatti A., Crawford T.M., Crites A.T., de Haan T., Desai S.,
Dobbs M.A., Foley R.J., Forman W.R., Garmire G.P., George E.M.,
Gladders M.D., Gonzalez A.H., Grandis S., Gupta N., Halverson N.W.,
Hlavacek-Larrondo J., Hoekstra H., Holder G.P., Holzapfel W.L., Hou Z.,
Hrubes J.D., Huang N., Jones C., Khullar G., Knox L., Kraft R., Lee A.T.,
von der Linden A., Luong-Van D., Mantz A., Marrone D.P., McDonald M.,
McMahon J.J., Meyer S.S., Mocanu L.M., Mohr J.J., Morris R.G., Padin S.,
Patil S., Pryke C., Rapetti D., Reichardt C.L., Rest A., Ruhl J.E.,
Saliwanchik B.R., Saro A., Sayre J.T., Schaffer K.K., Shirokoff E.,
Stalder B., Stanford S.A., Staniszewski Z., Stark A.A., Story K.T.,
Strazzullo V., Stubbs C.W., Vanderlinde K., Vieira J.D., Vikhlinin A.,
Williamson R., Zenteno A.
<Astrophys. J., 878, 55 (2019)>
=2019ApJ...878...55B 2019ApJ...878...55B
ADC_Keywords: Clusters, galaxy; Redshifts; Optical; Gravitational lensing;
X-ray sources; Surveys
Keywords: cosmological parameters ; cosmology: observations ;
galaxies: clusters: general ; large-scale structure of universe
Abstract:
We derive cosmological constraints using a galaxy cluster sample
selected from the 2500deg2 SPT-SZ survey. The sample spans the
redshift range 0.25<z<1.75 and contains 343 clusters with SZ detection
significance ξ>5. The sample is supplemented with optical weak
gravitational lensing measurements of 32 clusters with 0.29<z<1.13
(from Magellan and Hubble Space Telescope) and X-ray measurements of
89 clusters with 0.25<z<1.75 (from Chandra). We rely on minimal
modeling assumptions: (i) weak lensing provides an accurate means of
measuring halo masses, (ii) the mean SZ and X-ray observables are
related to the true halo mass through power-law relations in mass and
dimensionless Hubble parameter E(z) with a priori unknown parameters,
and (iii) there is (correlated, lognormal) intrinsic scatter and
measurement noise relating these observables to their mean relations.
We simultaneously fit for these astrophysical modeling parameters and
for cosmology. Assuming a flat νΛCDM model, in which the sum
of neutrino masses is a free parameter, we measure
Ωm=0.276±0.047, σ8=0.781±0.037, and
σ8(Ωm/0.3)0.2=0.766±0.025. The redshift evolutions
of the X-ray YX-mass and Mgas-mass relations are both consistent
with self-similar evolution to within 1σ. The mass slope of the
YX-mass relation shows a 2.3σ deviation from self-similarity.
Similarly, the mass slope of the Mgas-mass relation is steeper than
self-similarity at the 2.5σ level. In a νwCDM cosmology, we
measure the dark energy equation-of-state parameter w=-1.55±0.41
from the cluster data. We perform a measurement of the growth of
structure since redshift z∼1.7 and find no evidence for tension with
the prediction from general relativity. This is the first analysis of
the SPT cluster sample that uses direct weak-lensing mass calibration
and is a step toward using the much larger weak-lensing data set from
DES. We provide updated redshift and mass estimates for the SPT sample.
Description:
The South Pole Telescope (SPT) is a 10m telescope located within 1km
of the geographical South Pole. The ∼1' resolution and 1° field of
view are well suited for a survey of rare, high-mass clusters from a
redshift of z≥0.2 out to the highest redshifts where they exist. From
2007 to 2011, the telescope was configured to observe with the SPT-SZ
camera in three millimeter-wave bands (centered at 95, 150, and 220GHz).
We use the same SPT-SZ cluster sample that was analyzed in dH16
(de Haan+ 2016ApJ...832...95D 2016ApJ...832...95D). Namely, this cosmological sample is a
subset of the full SPT-SZ cluster sample presented in
Bleem+ (2015, J/ApJS/216/27), restricted to redshifts z>0.25 and
detection significances ξ>5.
We have improved the cluster redshift estimates from the original
values provided in Bleem+ (2015, J/ApJS/216/27) to incorporate new
spectroscopic measurements (Bayliss+ 2016, J/ApJS/227/3 ;
Khullar+ 2019ApJ...870....7K 2019ApJ...870....7K and A. Mantz et al. 2019, in prep.), two
updated high-redshift photo-z measurements with HST
(Strazzullo+ 2019A&A...622A.117S 2019A&A...622A.117S), and improved photometric measurements.
These improved photometric redshifts are enabled both via the
recalibration of our Spitzer redshift models using the new
spectroscopic data and by the use of optical data from the Parallel
Imager for Southern Cosmology Observations (PISCO), a new imager
installed on the Magellan/Clay telescope at Las Campanas Observatory.
We use X-ray measurements for a subsample of 89 clusters. Most of
those X-ray measurements were originally presented in
McDonald+ (2013, J/ApJ/774/23), and they were largely acquired through
a Chandra X-ray Visionary Project (PI: Benson). This sample is now
supplemented with observations of eight high-redshift z>1.2 clusters
(McDonald+ 2017ApJ...843...28M 2017ApJ...843...28M). See Section 2.2.
We use optical weak gravitational lensing (WL) measurement for 32
clusters in our sample. Of these, 19 were observed with
Magellan/Megacam at redshifts 0.29≤z≤0.69 (D19;
Dietrich+ 2019MNRAS.483.2871D 2019MNRAS.483.2871D), and 13 at redshifts 0.576≤z≤1.132
with the Advanced Camera for Surveys on board HST
(S18; 2018MNRAS.474.2635S 2018MNRAS.474.2635S). See Section 2.3.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table5.dat 148 677 Galaxy cluster candidates with ξ>4.5 in
the 2500 square-degree South Pole Telescope
Sunyaev Zel'dovich (SPT-SZ) survey
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
B/chandra : The Chandra Archive Log (CXC, 1999-2014)
J/ApJ/694/992 : SED of cluster radio galaxies (Lin+, 2009)
J/ApJ/761/22 : NIR galaxy cluster candidates in the SPT survey (Song+, 2012)
J/ApJ/774/23 : Chandra observations of SPT-SZ clusters (McDonald+, 2013)
J/ApJ/763/127 : Galaxy clusters discovered in SPT survey (Reichardt+, 2013)
J/ApJ/774/23 : Chandra observations of SPT-SZ clusters (McDonald+, 2013)
J/ApJ/779/61 : SPT-SZ survey at 95, 150 & 220GHz (Mocanu+, 2013)
J/ApJ/792/45 : SPT-SZ survey galaxy clusters opt. spectroscopy (Ruel+, 2014)
J/ApJS/216/27 : Galaxy clusters discovered in SPT-SZ survey (Bleem+, 2015)
J/MNRAS/449/835 : Clustering of SDSS DR7 main galaxy sample. I. (Ross+, 2015)
J/ApJS/227/3 : Full spectroscopic release of the SPT-GMOS (Bayliss+, 2016)
J/ApJS/224/1 : redMaPPer cluster catalog from DES data (Rykoff+, 2016)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [SPT-CL]
7- 16 A10 --- SPT-CL SPT-CL identifier (JHHMM+DDMM)
18- 21 A4 --- n_SPT-CL Note on SPT-CL (1)
23- 30 F8.4 deg RAdeg [0/360] Right Ascension (J2000)
32- 39 F8.4 deg DEdeg [-65.32/-39.8] Declination (J2000)
41- 45 F5.2 --- xi [4.5/42.4] Highest detection significance in
the filtered map
47- 50 F4.2 arcmin theta [0.25/3] Best core radius corresponding to
the detection
52- 58 E7.1 arcmin2 YSZ [4.1e-6/0.0005] Integrated Comptonization
within a 0.75' aperture
60- 66 E7.1 arcmin2 e_YSZ [3.4e-06/7.3e-05] Uncertainty in YSZ
68 A1 --- l_z Limit flag on z (2)
70- 74 F5.3 --- z [0.05/1.7]?=0 Redshift
76- 80 F5.3 --- e_z [0.015/0.2]?=0 Uncertainty in z
82- 84 A3 --- n_z Note on z (3)
86- 90 F5.2 10+14Msun M500 [2.4/16]?=0 Enclosed mass M500 without
systematic errors (4)
92- 95 F4.2 10+14Msun E_M500 [0.3/1.5]?=0 Upper error in M500
97-100 F4.2 10+14Msun e_M500 [0.5/2]?=0 Lower error in M500
102-106 F5.2 10+14Msun M200 [4/24.7]?=0 Enclosed mass M200 without
systematic errors
108-111 F4.2 10+14Msun E_M200 [0.6/2.4]?=0 Upper error in M200
113-116 F4.2 10+14Msun e_M200 [0.9/3]?=0 Lower error in M200
118-122 F5.2 10+14Msun M500sys [2/15]?=0 Enclosed mass M500 marginalized
over systematic errors (5)
124-127 F4.2 10+14Msun E_M500sys [0.4/2.3]?=0 Upper error in M500sys
129-132 F4.2 10+14Msun e_M500sys [0.6/3]?=0 Lower error in M500sys
134-138 F5.2 10+14Msun M200sys [3.5/23.4]?=0 Enclosed mass M200
marginalized over systematic errors
140-143 F4.2 10+14Msun E_M200sys [0.6/3.6]?=0 Upper error in M200sys
145-148 F4.2 10+14Msun e_M200sys [1/4.8]?=0 Lower error in M200sys
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Note (1): Note as follows:
WL = Clusters with follow-up optical weak gravitational lensing that we use
in this work (32 occurrences);
X = Clusters with X-ray data that we use in this work (89 occurrences).
Note (2): Indicates an unconfirmed SZ detection.
Note (3): Note as follows:
+ = A spectroscopic redshift derived from follow-up observations.
* = Updated redshift since Bleem+ (2015, J/ApJS/216/27).
Note (4): Defined as the mass enclosed within a radius at which the average
density is 500 times the critical density at the cluster redshift.
Note (5): These estimates also account for the systematic uncertainties on
scaling relation parameters and cosmology.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 03-Dec-2020