J/ApJ/772/25 Massive SZE clusters observations with ACT (Sifon+, 2013)
The Atacama Cosmology Telescope: dynamical masses and scaling relations for a
sample of massive Sunyaev-Zel'dovich effect selected galaxy clusters.
Sifon C., Menanteau F., Hasselfield M., Marriage T.A., Hughes J.P.,
Barrientos L.F., Gonzalez J., Infante L., Addison G.E., Baker A.J.,
Battaglia N., Bond J.R., Crichton D., Das S., Devlin M.J., Dunkley J.,
Dunner R., Gralla M.B., Hajian A., Hilton M., Hincks A.D., Kosowsky A.B.,
Marsden D., Moodley K., Niemack M.D., Nolta M.R., Page L.A., Partridge B.,
Reese E.D., Sehgal N., Sievers J., Spergel D.N., Staggs S.T.,
Thornton R.J., Trac H., Wollack E.J.
<Astrophys. J., 772, 25 (2013)>
=2013ApJ...772...25S 2013ApJ...772...25S
ADC_Keywords: Clusters, galaxy ; Galaxies, spectra ; Redshifts
Keywords: cosmic background radiation; cosmology: observations;
galaxies: clusters: general; galaxies: distances and redshifts
Abstract:
We present the first dynamical mass estimates and scaling relations
for a sample of Sunyaev-Zel'dovich effect (SZE) selected galaxy
clusters. The sample consists of 16 massive clusters detected with the
Atacama Cosmology Telescope (ACT) over a 455deg2 area of the
southern sky. Deep multi-object spectroscopic observations were taken
to secure intermediate-resolution (R∼700-800) spectra and redshifts
for ~60 member galaxies on average per cluster. The dynamical
masses M200c of the clusters have been calculated using
simulation-based scaling relations between velocity dispersion and
mass. The sample has a median redshift z=0.50 and a median mass
M200c∼12x1014h70-1M☉ with a lower limit
M200c∼6x1014h70-1M☉, consistent with the expectations
for the ACT southern sky survey. These masses are compared to the ACT
SZE properties of the sample, specifically, the match-filtered central
SZE amplitude {overline}{y0}, the central Compton parameter y0,
and the integrated Compton signal Y200c, which we use to derive
SZE-mass scaling relations. All SZE estimators correlate with
dynamical mass with low intrinsic scatter (≲20%), in agreement with
numerical simulations. We explore the effects of various systematic
effects on these scaling relations, including the correlation between
observables and the influence of dynamically disturbed clusters. Using
the three-dimensional information available, we divide the sample into
relaxed and disturbed clusters and find that ∼50% of the clusters are
disturbed. There are hints that disturbed systems might bias the
scaling relations, but given the current sample sizes, these
differences are not significant; further studies including more
clusters are required to assess the impact of these clusters on the
scaling relations.
Description:
The spectroscopic observations were carried out in two semesters,
2009B and 2010B. Each semester was split into two observing runs, one
with FORS2 at the Very Large Telescope (VLT) and one with GMOS at
Gemini South, both telescopes located in Chile. In total, we had 89hr
of observation, during which we collected multi-object spectroscopy
for 19 clusters.
The subsample contains 15 systems that were detected by the Atacama
Cosmology Telescope (ACT), at 148GHz, in the 2008 single-season maps
(Marriage et al. 2011ApJ...737...61M 2011ApJ...737...61M) and confirmed optically on 4m
class telescopes (Menanteau et al. 2010ApJ...723.1523M 2010ApJ...723.1523M), plus one
additional cluster (ACT-CL J0521-5104) detected in the new analysis
of multi-season maps. Of the 16 SZE-detected clusters reported here,
10 are newly discovered by ACT.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 53 16 ACTi Sunyaev-Zel'dovich effect (SZE) measurements
of clusters
table8.dat 114 961 Spectroscopic members of the 16 ACT clusters
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See also:
VIII/88 : Planck Early Release Compact Source Catalogue (Planck, 2011)
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
J/MNRAS/439/1556 : ACT high significance 148 & 218GHz sources (Marsden+, 2014)
J/ApJ/771/137 : WMAP observations of Planck ESZ clusters (Ma+, 2013)
J/ApJ/763/127 : Galaxy clusters in the SPT survey (Reichardt+, 2013)
J/ApJ/731/100 : 148GHz ACT extragalactic sources catalog (Marriage+, 2011)
J/ApJS/191/340 : Southern Cosmology Survey. II. (Menanteau+, 2010)
J/ApJ/694/992 : SED of cluster radio galaxies (Lin+, 2009)
J/AJ/137/4795 : Dynamical state of brightest cluster of gal. (Coziol+, 2009)
J/MNRAS/376/1073 : Sunyaev-Zel'dovich effect in galaxy clusters (Zemcov+, 2007)
J/MNRAS/368/651 : A3653 galaxies redshift catalogue (Pimbblet+, 2006)
J/AJ/126/2152 : Cluster And Infall Region Nearby Survey. I (Rines+, 2003)
J/A+A/310/8 : The ESO Nearby Abell Cluster Survey I. (Katgert+, 1996)
J/MNRAS/224/453 : Velocity data of rich clusters (Colless+ 1987)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- --- [ACT-CL]
8- 17 A10 --- ACT-CL Cluster identifier (JHHMM+DDMM)
19- 23 F5.3 --- z [0.2/1.1] Redshift
25- 28 F4.2 10-4 dy0 [0.4/3.6] Central match-filtered amplitude of
the SZE cluster (1)
30- 33 F4.2 10-4 e_dy0 [0.1/0.5] dy0 uncertainty
35- 38 F4.2 10-4 y0 [0.5/5.7] Projected central Compton
parameter (2)
40- 43 F4.2 10-4 e_y0 [0.1/0.7] y0 uncertainty
45- 48 F4.2 10-10 Y200c [0.1/1.5] Spherically integrated Compton
amplitude within r200c (3)
50- 53 F4.2 10-10 e_Y200c [0.03/0.4] Y200c uncertainty
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Note (1): Central match-filtered amplitude of the SZE, measured using the
A10 (Arnaud et al., 2010A&A...517A..92A 2010A&A...517A..92A) profile with a FWHM of 2'.
See Hasselfield et al. (2013JCAP...07..008H 2013JCAP...07..008H).
Note (2): Projected central Compton parameter assuming the A10 (Arnaud et al.,
2010A&A...517A..92A 2010A&A...517A..92A) profile.
See Hasselfield et al. (2013JCAP...07..008H 2013JCAP...07..008H).
Note (3): Spherically integrated Compton amplitude within r200c assuming
the A10 (Arnaud et al., 2010A&A...517A..92A 2010A&A...517A..92A) profile. See Section 2.1.2.
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [SMH_]
5- 22 A18 --- SMH Galaxy identifier (JHHMMSS.s+DDMMSS.s)
24- 25 I2 h RAh [1/7] Hour of Right Ascension (J2000)
27- 28 I2 min RAm Minute of Right Ascension (J2000)
30- 33 F4.1 s RAs Second of Right Ascension (J2000)
35 A1 --- DE- [-] Sign of the Declination (J2000)
36- 37 I2 deg DEd [49/55] Degree of Declination (J2000)
39- 40 I2 arcmin DEm Arcminute of Declination (J2000)
42- 45 F4.1 arcsec DEs Arcsecond of Declination (J2000)
47- 52 F6.3 mag imag [16.4/23.5]?=99.99 The i band magnitude
54- 60 F7.5 --- z [0.2/1.1] Cross-correlation redshift (1)
62- 68 F7.5 --- e_z [0/0.003] Error in z (1)
70- 74 F5.2 --- rcc [1.7/27] Cross-correlation S/N; Tonry & Davis
1979AJ.....84.1511T 1979AJ.....84.1511T (1)
76-114 A39 --- MSF Main Spectral Features
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Note (1): Galaxy redshifts are measured by cross-correlating the spectra with
galaxy spectral templates of the SDSS DR7 using the RVSAO/XCSAO
package for IRAF (Kurtz & Mink 1998PASP..110..934K 1998PASP..110..934K); the spectral
features in each spectrum have been confirmed with the 2D spectra by
visual inspection.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 27-Jan-2015