J/A+A/676/A127 CODEX cluster sample (Damsted+, 2023)
CODEX: Role of velocity substructure in scaling relations of galaxy clusters.
Damsted S., Finoguenov A., Clerc N., Davalgaite I., Kirkpatrick C.C.,
Mamon G.A., Ider Chitham J., Kiiveri K., Comparat J., Collins C.
<Astron. Astrophys. 676, A127 (2023)>
=2023A&A...676A.127D 2023A&A...676A.127D (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; X-ray sources ; Optical ; Velocity dispersion
Keywords: catalogs - galaxies: clusters: general - X-rays: galaxies: clusters -
large-scale structure of Universe
Abstract:
The use of galaxy clusters as cosmological probes relies on a detailed
understanding of their properties. They define cluster selection and
ranking, which is linked to a cosmologically significant cluster mass
function. Previous studies have employed small samples of clusters,
concentrating on achieving the first calibrations of cluster
properties with mass, and the diversity of cluster properties has been
revealed via detailed studies. The large spectroscopic follow-up on
the CODEX cluster sample with SDSS and NOT enables a detailed study of
hundreds of clusters, lifting the limitations of previous samples. We
aim to update the spectroscopic cluster identification of CODEX by
running the spectroscopic group finder on the follow-up spectroscopy
results and connecting the dynamical state of clusters to their
scaling relations. We implemented a reproducible spectroscopic
membership determination and cleaning procedures, based on the
redMaPPer membership, running the spectroscopic group finder on the
follow-up spectroscopy results and cleaning the membership for
spectroscopic outliers. We applied the Anderson-Darling test for
velocity substructure and analysed its influence on the scaling
relations. We also tested the effect of the X-ray-to-optical centre
offset on the scaling relations.
We report on the scaling relations between richness, X-ray luminosity,
and velocity dispersion for a complete sample of clusters with at
least 15 members. Clusters with velocity substructure exhibit enhanced
velocity dispersion for a given richness and are characterized by 2.5
times larger scatter. Clusters that have a strong offset in
X-ray-to-optical centres have comparable scaling relations as clusters
with substructure. We demonstrate that there is a consistency in the
parameters of the scaling relations for the low and high richness of
galaxy clusters. Splitting the clusters by redshift, we note a
decrease in scatter with redshift in all scaling relations. We
localize the redshift range where a high scatter is observed to
z<0.15, which is in agreement with literature results on the
scatter. We note that the increase in scatter for both high- and
low-luminosity clusters is z<0.15 and suggest that both cooling and
the resulting active galactic nucleus feedback are at the root this
scatter.
Description:
Targeted spectroscopic follow-up of CODEX clusters was performed as a
part of SDSS-III (Eisenstein et al., 2011AJ....142...72E 2011AJ....142...72E) and
continued as a part of the SPIDERS programme of the SDSS-IV survey
(Blanton et al., 2017AJ....154...28B 2017AJ....154...28B).
In addition to SDSS spectroscopy, we include here the results of CODEX
observations performed at the NOT under programmes 48-025, 51-035,
52-026, and 53-020 (PI: A. Finoguenov) and during the NOT observing
school of FINCA, which covers five clusters with a richness greater
than 50 and a red-sequence redshift greater than 0.3.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 58 66274 CODEX red-sequence galaxy to SCGF group assignment
tablea2.dat 168 640 Clean CODEX spectroscopic cluster catalogue,
spectroscopically identified with SCGF
tablea3.dat 179 611 Clean CODEX spectroscopic cluster catalogue,
spectroscopically confirmed using SPIDERS
manual inspection
tablea4.dat 56 28958 Clean cluster member galaxy catalogue
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- SPIDERS SPIDERS ID (SPIDERS_ID)
9- 18 F10.6 deg RAdeg Right ascension of galaxy (J2000) (RA_GAL)
20- 29 F10.6 deg DEdeg Declination of galaxy (J2000) (DEC_GAL)
31- 38 F8.6 --- zsp Spectroscopic redshift of galaxy (GAL_SPECZ)
40- 47 F8.6 --- Psat Probability of being a satellite (P_SAT)
49- 52 I4 --- Nsat Number of satellites (N_SAT)
54- 58 I5 --- SCGF SCGF ID (SCGF_ID)
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- SPIDERS SPIDERS ID (SPIDERS_ID)
9- 13 I5 --- SCGF SCGF group ID (SCGF_ID)
15- 17 I3 --- NgalClean Number of clean galaxies (NGAL_CLEAN)
19- 27 F9.7 --- zsp Spectroscopic cluster redshift (CLU_SPECZ)
29- 36 F8.3 km/s sigmaGap Cluster Gapper velocity dispersion
(CLUVDISP_GAP)
38- 44 F7.3 km/s e_sigmaGap Gapper velocity dispersion error
(CLUVDISPGAPE)
46- 53 F8.3 kpc R200c R200c accounting for aperture effects in
velocity dispersion (CLU_R200C)
55- 66 E12.6 --- alpha AD test statistic (ALPHA)
68 I1 --- NGflag Gaussianity flag (NGFLAG)
70- 78 F9.5 deg RAXdeg CODEX X-ray centre right ascension (J2000)
(RA_XRAY)
80- 88 F9.5 deg DEXdeg CODEX X-ray centre declination (J2000)
(DEC_XRAY)
90- 99 F10.6 --- lambdaOpt Optical richness (LAMBDACHISQOPT)
101-110 F10.7 --- e_lambdaOpt Optical richness error (LAMBDACHISQOPT_E)
112-121 F10.6 deg RAOdeg SCGF group centre right ascension (J2000)
(RA_OPT)
123-132 F10.6 deg DEOdeg SCGF group centre declination (J2000)
(DEC_OPT)
134-145 E12.6 10-7W LX X-ray luminosity, 0.1-2.4keV (LX0124)
147-158 E12.6 10-7W e_LX X-ray luminosity error, 68% c.l. (LX0124_E)
160-168 F9.7 --- Sampling [0/1] Spectroscopic sampling of red-sequence
members inside CLU_R200CSpect (SAMPLING)
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- SPIDERS SPIDERS ID (SPIDERS_ID)
9- 11 I3 --- NgalClean Number of clean galaxies (NGAL_CLEAN)
13- 20 F8.6 --- zsp Spectroscopic cluster redshift (CLU_SPECZ)
22- 29 F8.3 km/s sigmaGap Cluster Gapper velocity dispersion
(CLUVDISP_GAP)
31- 37 F7.3 km/s e_sigmaGap Gapper velocity dispersion error
(CLUVDISPGAPE)
39- 46 F8.3 kpc R200c R200c in kpc (CLU_R200C)
48- 59 E12.6 --- alpha AD test statistic (ALPHA)
61 I1 --- NGflag Gaussianity flag (NGFLAG)
63- 71 F9.5 deg RAXdeg CODEX X-ray centre right ascension (J2000)
(RA_XRAY)
73- 81 F9.5 deg DEXdeg ? CODEX X-ray centre declination (J2000)
(DEC_XRAY)
83- 92 F10.6 --- lambdaOpt Optical richness (LAMBDACHISQOPT)
94-103 F10.7 --- e_lambdaOpt Optical richness error (LAMBDACHISQOPT_E)
105-114 F10.6 deg RAOdeg redMaPPer centre right ascension (RA_OPT)
116-125 F10.6 deg DEOdeg redMaPPer centre declination (DEC_OPT)
127-138 E12.6 10-7W LX X-ray luminosity, 0.1-2.4 keV (LX0124)
140-151 E12.6 10-7W e_LX X-ray luminosity error, 68% c.l. (LX0124_E)
153-161 F9.7 --- Sampling [0/1] Spectroscopic sampling of red-sequence
members inside CLU_R200C (SAMPLING)
163-170 F8.3 --- InCvdisp Cluster velocity dispersion from SPIDERS
manual inspection (INPUT_CLUVDISP)
172-179 F8.6 --- InCz Cluster redshift from SPIDERS manual
inspection (INPUT_CLUZ)
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Byte-by-byte Description of file: tablea4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- SPIDERS SPIDERS ID (SPIDERS_ID)
9- 13 I5 --- SCGF ?=- SCGF group ID (SCGF_ID)
15- 24 F10.6 deg RAdeg Galaxy right ascension (FK5) (J2000) (RA_GAL)
26- 35 F10.6 deg DEdeg Galaxy declination (FK5) (J2000) (DEC_GAL)
37- 44 F8.6 --- zsp Galaxy spectroscopic redshift (GAL_SPECZ)
46- 50 A5 --- InSPIDERS [true false] true if in SPIDERS catalog
(IN_SPIDERS)
52- 56 A5 --- InSCGF [true false] true if in SCGF catalog
(IN_SCGF)
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Acknowledgements:
Alexis Finoguenov, alexis.finoguenov(at)helsinki.fi
(End) Patricia Vannier [CDS] 05-Jul-2023