J/ApJS/244/22 SDSS DR8 redMaPPer clusters Chandra follow-up (Hollowood+, 2019)
Chandra follow-up of the SDSS DR8 redMaPPer catalog using the MATCha pipeline.
Hollowood D.L., Jeltema T., Chen X., Farahi A., Evrard A., Everett S.,
Rozo E., Rykoff E., Bernstein R., Bermeo-Hernandez A., Eiger L., Giles P.,
Israel H., Michel R., Noorali R., Romer A.K., Rooney P., Splettstoesser M.
<Astrophys. J. Suppl. Ser., 244, 22 (2019)>
=2019ApJS..244...22H 2019ApJS..244...22H
ADC_Keywords: Clusters, galaxy; X-ray sources; Redshifts
Keywords: cosmology: observations ; dark energy ; galaxies: clusters: general ;
X-rays: galaxies: clusters
Abstract:
In order to place constraints on cosmology through optical surveys of
galaxy clusters, one must first understand the properties of those
clusters. To this end, we introduce the Mass Analysis Tool for Chandra
(MATCha), a pipeline that uses a parallellized algorithm to analyze
archival Chandra data. MATCha simultaneously calculates X-ray
temperatures and luminosities and performs centering measurements for
hundreds of potential galaxy clusters using archival X-ray exposures.
We run MATCha on the redMaPPer SDSS DR8 cluster catalog and use
MATCha's output X-ray temperatures and luminosities to analyze the
galaxy cluster temperature-richness, luminosity-richness,
luminosity-temperature, and temperature-luminosity scaling relations.
We detect 447 clusters and determine 246 r2500 temperatures across
all redshifts. Within 0.1<z<0.35, we find that r2500 TX scales
with optical richness (λ) as
ln(kBTX/1.0keV)=(0.52±0.05)ln(λ/70)+(1.85±0.03) with an
intrinsic scatter of 0.27±0.02 (1σ). We investigate the
distribution of offsets between the X-ray center and redMaPPer center
within 0.1<z<0.35, finding that 68.3%±6.5% of clusters are
well-centered. However, we find a broad tail of large offsets in this
distribution, and we explore some of the causes of redMaPPer
miscentering.
Description:
We introduce MATCha (Mass Analysis Tool for Chandra), a pipeline that
is capable of performing a parallel analysis of hundreds of galaxy
clusters in archival Chandra data. We run MATCha on the galaxy cluster
catalog generated by redMaPPer's analysis of SDSS DR8 data (see
Rykoff+, 2014, J/ApJ/785/104 and 2016, J/ApJS/224/1).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 119 367 MATCha cluster name and flags
table6.dat 369 367 MATCha cluster scaling relations information
table7.dat 122 367 MATCha cluster centering information
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See also:
B/chandra : The Chandra Archive Log (CXC, 2014)
J/ApJS/182/12 : ICM entropy profiles (ACCEPT) (Cavagnolo+, 2009)
J/ApJ/746/178 : The augmented maxBCG cluster catalog (Rykoff+, 2012)
J/ApJ/785/104 : redMaPPer. I. Algorithm applied to SDSS DR8 (Rykoff+, 2014)
J/A+A/575/A30 : HIFLUGCS XMM/Chandra cross-calibration (Schellenberger+, 2015)
J/ApJS/224/1 : redMaPPer cluster catalog from DES data (Rykoff+, 2016)
J/ApJ/856/172 : The HectoMAP cluster survey. I. (Sohn+, 2018)
J/ApJ/862/172 : HeCS-red: Hectospec surveys of redMaPPer cl. (Rines+, 2018)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- MMID [2/50469] Cluster's redMaPPer MEM MATCH ID
7- 27 A21 --- Name Cluster redMaPPer name
29- 68 A40 --- ObsIDs Comma-delimited list of Chandra ObsIDs
70- 77 F8.6 --- z [0.1/0.4] redMaPPer-determined cluster redshift
79- 83 A5 --- f-det Flag, Detected (1)
85- 89 A5 --- f-edge Flag, On Chip Edge (2)
91- 95 A5 --- f-Off Flag, On Off-Axis Chip (3)
97-101 A5 --- f-Ser Flag, Serendipitous (4)
103-112 F10.6 --- SNR500 [-7/588]? Signal-to-noise ratio within 500kpc
aperture
114-119 F6.4 --- e_SNR500 [1/3]? 1σ equivalent uncertainty in SNR500
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Note (1): The Detected column is a Boolean value which is true if the
cluster was detected (SNR≥5.0). See subsection 3.2 for details.
Note (2): The On Chip Edge column is a Boolean value which is true if the
cluster is on a chip edge in all of its observations. Note that it is
not necessarily a problem for this to be the case---one needs to refer
to the relevant "Edge Exclusion" columns in Tables 6 and 7.
Note (3): The On Off-Axis Chip column is a Boolean value which is true if
the cluster is on non-aimpoint chips for all of its observations.
Note (4): The Serendipitous column is a Boolean value which is true if the
cluster is never the aimpoint of an observation. This is somewhat
subjective, so we focus on eliminating false positives. That is, if a
cluster is marked "serendipitous", it is certainly not the aimpoint of
any observation under consideration; if it is not marked
"serendipitous", it may still be the case that it is not the aimpoint
of any observation under consideration.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- MMID [2/50469] Cluster's redMaPPer MEM MATCH ID
7- 13 F7.3 --- lambda [19.9/200] redMaPPer assigned cluster
richness
15- 20 F6.4 --- e_lambda [1.8/9.6] Symmetric 1σ equivalent
uncertainty in lambda
22- 38 E17.11 10-7W Lx-r2500 ? Soft-band X-ray luminosity, r2500 radius
40- 56 E17.11 10-7W e_Lx-r2500 ? lower uncertainty, Lx-r2500
58- 74 E17.11 10-7W E_Lx-r2500 ? upper uncertainty, Lx-r2500
76- 92 E17.11 10-7W Lbolr2500 ? Bolometric X-ray luminosity, r2500 radius
94-110 E17.11 10-7W e_Lbolr2500 ? lower uncertainty, Lbolr2500
112-128 E17.11 10-7W E_Lbolr2500 ? upper uncertainty, Lbolr2500
130-136 F7.4 keV Tx-r2500 [1.4/16]? X-ray temperature, r2500 radius
138-144 F7.5 keV e_Tx-r2500 [0.07/3]? lower uncertainty, Tx-r2500
146-152 F7.5 keV E_Tx-r2500 [0.07/6.4]? upper uncertainty, Tx-r2500
154-170 E17.11 10-7W Lx-r500 ? Soft-band X-ray luminosity, r500 radius
172-188 E17.11 10-7W e_Lx-r500 ? lower uncertainty, Lx-r500
190-206 E17.11 10-7W E_Lx-r500 ? upper uncertainty, Lx-r500
208-224 E17.11 10-7W Lbolr500 ? Bolometric X-ray luminosity, r500 radius
226-242 E17.11 10-7W e_Lbolr500 ? lower uncertainty, Lbolr500
244-260 E17.11 10-7W E_Lbolr500 ? upper uncertainty, Lbolr500
262-268 F7.4 keV Tx-r500 [1.5/61.2]? X-ray temperature, r500 radius
270-276 F7.5 keV e_Tx-r500 [0.06/6.5]? lower uncertainty, Tx-r500
278-285 F8.5 keV E_Tx-r500 [0.06/22.4]? upper uncertainty, Tx-r500
287-303 E17.11 10-7W Lx-fixed ? Fixed-Tx X-ray luminosity (5)
305-321 E17.11 10-7W e_Lx-fixed ? lower uncertainty, Lx-fixed
323-339 E17.11 10-7W E_Lx-fixed ? upper uncertainty, Lx-fixed
341-357 E17.11 10-7W Lx-limit ? Upper Limit on Lx if cluster not detected
359-363 A5 --- f-r2500 r2500 Edge Exclusion (6)
365-369 A5 --- f-r500 r500 Edge Exclusion (6)
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Note (5): The "Fixed-TX LX" columns contains the LX value determined for the
cluster if it is calculated via the method outlined in subsection 3.4,
and associated uncertainty.
Note (6): "Edge Exclusion" columns contain Boolean values which are true if
proximity to the chip edge is considered to be a problem for Lx and Tx
in r2500/r500. When these "Edge Exclusion" columns are true, the given
cluster is removed from the relevant scaling relation (see subsection 3.6).
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- MMID [2/50469] Cluster's redMaPPer MEM MATCH ID
7- 22 F16.12 deg RAdeg redMaPPer Right Ascension of BCG (J2000)
24- 41 F18.14 deg DEdeg redMaPPer Declination of BCG (J2000)
43- 52 F10.6 deg RAr2deg ? r2500 Centroid Right Ascension (J2000)
54- 63 F10.6 deg DEr2deg ? r2500 Centroid Declination (J2000)
65- 74 F10.6 deg RAr5deg ? r500 Centroid Right Ascension (J2000)
76- 85 F10.6 deg DEr5deg ? r500 Centroid Declination (J2000)
87-100 F14.10 deg RAPkdeg ? Cluster X-Ray Peak Right Ascension (J2000)
102-116 F15.11 deg DEPkdeg ? Cluster X-Ray Peak Declination (J2000)
118-122 A5 --- f-Edge Edge Exclusion (7)
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Note (7): The "Edge Exclusion" column contains a Boolean value which is true
if the given cluster's proximity to chip edges is considered a problem
for centering. When this "Edge Exclusion" column is true, the given
cluster is removed from the centering distribution (see subsection 3.6).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 18-Feb-2020