J/A+A/685/A106 eRASS. Galaxy clusters and groups in WGH (Bulbul+, 2024)
The SRG/eROSITA All-Sky Survey. The first catalog of galaxy clusters and
groups in the Western Galactic Hemisphere.
Bulbul E., Liu A., Kluge M., Zhang X., Sanders J.S., Bahar Y.E.,
Ghirardini V., Artis E., Seppi R., Garrel C., Ramos-Ceja M.E., Comparat J.,
Balzer F., Boeckmann K., Brueggen M., Clerc N., Dennerl K., Dolag K.,
Freyberg M., Grandis S., Gruen D., Kleinebreil F., Krippendorf S.,
Lamer G., Merloni A., Migkas K., Nandra K., Pacaud F., Predehl P.,
Reiprich T.H., Schrabback T., Veronica A., Weller J., Zelmer S.
<Astron. Astrophys. 685, A106 (2024)>
=2024A&A...685A.106B 2024A&A...685A.106B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies ; X-ray sources ; Redshifts
Keywords: catalogs - galaxies: clusters: general -
large-scale structure of Universe - X-rays: galaxies -
X-rays: galaxies: clusters
Abstract:
Clusters of galaxies can be used as powerful probes to study
astrophysical processes on large scales, test theories of the growth
of structure, and constrain cosmological models. The driving science
goal of the SRG/eROSITA All-Sky Survey is to assemble a large sample
of X-ray clusters with a well-defined selection function to determine
the evolution of the mass function and, hence, the cosmological
parameters. We present here a catalog of 12,247 optically confirmed
galaxy groups and clusters detected in the 0.2-2.3keV as extended
X-ray sources in a 13116 deg2 region in the western Galactic half of
the sky, which eROSITA surveyed in its first six months of operation.
The clusters in the sample span the redshift range 0.003<z<1.32. The
majority (68%) of these clusters, 8361 sources, represent new
discoveries without known counterparts in the literature. The mass
range of the sample covers three orders of magnitude from
5x1012M☉ to 2x1015M☉. We construct a sample for
cosmology with a higher purity level (∼95%) than the primary
sample, comprising 5,259 securely detected and confirmed clusters in
the 12791 deg2 common footprint of eRASS1 and the DESI Legacy Survey
DR10.We characterize the X-ray properties of each cluster, including
their flux, luminosity and temperature, the total mass, gas mass, gas
mass fraction, and mass proxy YX. These are determined within two
apertures, 300kpc, and the overdensity radius R500, and are calculated
by applying a forward modeling approach with a rigorous X-ray
background treatment, K-factor, and the Galactic absorption
corrections. Population studies utilizing logN-logS, the number of
clusters detected above a given flux limit, and the luminosity
function show overall agreement with the previous X-ray surveys after
accounting for the survey completeness and purity through the
selection function. The first eROSITA All-Sky Survey provides an
unprecedented sample of galaxy groups and clusters selected in the
X-ray band. The eRASS1 cluster catalog demonstrates the excellent
performance of eROSITA for extended source detection, consistent with
the pre-launch expectations for the final all-sky survey, eRASS:8.
Description:
We here present the catalog of clusters of galaxies in the Western
Galactic hemisphere detected by the first eROSITA All-Sky Survey in
the soft energy band (0.2-2.3keV). The eRASS1 sample, with 12247
confirmed galaxy clusters selected in the effective survey area of
13116 deg2, represents the largest statistically well-defined sample
of galaxy clusters and groups based on the ICM selection to date.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
emain.dat 6227 12247 Primary galaxy clusters and groups catalog
ecosmos.dat 247 5259 Cosmology Sample
fits/* . 2 fits version of the catalogues
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See also:
J/A+A/682/A34 : SRG/eROSITA all-sky survey catalogs (eRASS1) (Merloni+, 2024)
J/A+A/683/A130 : eRASS Western Galactic Hemisphere Superclusters (Liu+, 2024)
Byte-by-byte Description of file: emain.dat
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Bytes Format Units Label Explanations
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1- 32 A32 --- DetUId Unique source ID, as in main eRASS1
X-ray catalog (Merloni et al.,
2024, Cat. J/A+A/682/A34)
34- 56 A23 --- Name Source name, 1eRASS JHHMMSS.s+DDMMSS
58- 72 F15.11 deg RAdeg Right ascension (J2000)
74- 88 F15.11 deg DEdeg Declination J2000)
90- 97 F8.4 deg RAXdeg Best-fit Right ascension after the
image is fit with MBProj2D
(RA_XFIT)
99- 106 F8.4 deg DEXdeg Best-fit Declination after the image
is fit with MBProj2D (DEC_XFIT)
108- 119 E12.6 --- ExtLike Source extent likelihood
121- 132 E12.6 --- DetLike0 Source detection likelihood in
0.2-2.3keV
134- 139 F6.1 s Exp Average exposure
141- 146 F6.4 --- zBest Best available redshift
148- 154 F7.4 --- e_zBest ?=-1 sigma error of BEST_Z
156- 166 A11 --- zType Type of zBest (1)
168- 172 F5.3 --- pcont [0/1] Contamination probability
174- 180 F7.3 ct/s CR300kpc 0.2-2.3keV count rate within 300kpc
182- 188 F7.3 ct/s b_CR300kpc 1sigma lower limit of CR300kpc
190- 196 F7.3 ct/s B_CR300kpc 1sigma upper limit of CR300kpc
198- 205 F8.3 ct/s CR500 0.2-2.3keV count rate within R500
207- 214 F8.3 ct/s b_CR500 1sigma lower limit of CR500
216- 223 F8.3 ct/s B_CR500 1sigma upper limit of CR500
225- 232 F8.1 ct CTS300kpc 0.2-2.3keV counts within 300kpc
234- 241 F8.1 ct b_CTS300kpc 1sigma lower limit of CTS300kpc
243- 250 F8.1 ct B_CTS300kpc 1sigma upper limit of CTS300kpc
252- 259 F8.1 ct CTS500 0.2-2.3keV counts within R500
261- 268 F8.1 ct b_CTS500 1sigma lower limit of CTS500
270- 277 F8.1 ct B_CTS500 1sigma upper limit of CTS500
279- 287 F9.3 mW/m2 F300kpc ?=-1 0.2-2.3keV flux within 300kpc
289- 297 F9.3 mW/m2 b_F300kpc ?=-1 1sigma lower limit of F300kpc
299- 307 F9.3 mW/m2 B_F300kpc 1sigma upper limit of F300kpc
309- 318 F10.3 mW/m2 F500 ?=-1 0.2-2.3keV flux within R500
320- 329 F10.3 mW/m2 b_F500 ?=-1 1sigma lower limit of F500
331- 340 F10.3 mW/m2 B_F500 1sigma upper limit of F500
342- 349 F8.3 10+35J L300kpc ?=-1 0.2-2.3keV luminosity
within 300kpc
351- 358 F8.3 10+35J b_L300kpc ?=-1 1sigma lower limit of L300kpc
360- 369 F10.3 10+35J B_L300kpc 1sigma upper limit of L300kpc
371- 379 F9.3 10+35J L500 ?=-1 0.2-2.3keV luminosity
within R500
381- 389 F9.3 10+35J b_L500 ?=-1 1sigma lower limit of L500
391- 400 F10.3 10+35J B_L500 1sigma upper limit of L500
402- 408 F7.3 ct/s CR300kpcT 0.5-2.0keV count rate within 300kpc
410- 416 F7.3 ct/s b_CR300kpcT 1sigma lower limit of CR300kpcT
418- 424 F7.3 ct/s B_CR300kpcT 1sigma upper limit of CR300kpcT
426- 432 F7.3 ct/s CR500T 0.5-2.0keV count rate within R500
434- 440 F7.3 ct/s b_CR500T 1sigma lower limit of CR500T
442- 448 F7.3 ct/s B_CR500T 1sigma upper limit of CR500T
450- 457 F8.1 ct CTS300kpcT 0.5-2.0keV counts within 300kpc
459- 466 F8.1 ct b_CTS300kpcT 1sigma lower limit of CTS300kpcT
468- 475 F8.1 ct B_CTS300kpcT 1sigma upper limit of CTS300kpcT
477- 484 F8.1 ct CTS500T 0.5-2.0keV counts within R500
486- 493 F8.1 ct b_CTS500T 1sigma lower limit of CTS500T
495- 502 F8.1 ct B_CTS500T 1sigma upper limit of CTS500T
504- 512 F9.3 10-14mW/m2 F300kpcT ?=-1 0.5-2.0keV flux within 300kpc
514- 522 F9.3 10-14mW/m2 b_F300kpcT ?=-1 1sigma lower limit of F300kpcT
524- 532 F9.3 10-14mW/m2 B_F300kpcT 1sigma upper limit of F300kpcT
534- 542 F9.3 10-14mW/m2 F500T ?=-1 0.5-2.0keV flux within R500
544- 552 F9.3 10-14mW/m2 b_F500T ?=-1 1sigma lower limit of F500T
554- 562 F9.3 10-14mW/m2 B_F500T 1sigma upper limit of F500T
564- 571 F8.3 10+35J L300kpcT ?=-1 0.5-2.0keV luminosity
within 300kpc
573- 580 F8.3 10+35J b_L300kpcT ?=-1 1sigma lower limit of L300kpcT
582- 590 F9.3 10+35J B_L300kpcT 1sigma upper limit of L300kpcT
592- 599 F8.3 10+35J L500T ?=-1 0.5-2.0keV luminosity
within R500
601- 608 F8.3 10+35J b_L500T ?=-1 1sigma lower limit of L500T
610- 618 F9.3 10+35J B_L500T 1sigma upper limit of L500T
620- 628 F9.3 10+35J Lbol500 ?=-1 Bolometric luminosity
within R500
630- 638 F9.3 10+35J b_Lbol500 ?=-1 1sigma lower limit of Lbol500
640- 651 E12.6 10+35J B_Lbol500 1sigma upper limit of Lbol500
653- 658 F6.2 keV KT ?=-1 Temperature measured by
MBProj2D
660- 665 F6.2 keV b_KT ?=-1 1sigma lower limit of KT
667- 672 F6.2 keV B_KT ?=-1 1sigma upper limit of KT
674- 680 F7.2 10+11Msun Mgas500 ?=-1 Calibrated cluster gas mass
within R500
682- 688 F7.2 10+11Msun b_Mgas500 ?=-1 1sigma lower limit of Mgas500
690- 696 F7.2 10+11Msun B_Mgas500 1sigma upper limit of Mgas500
698- 705 F8.2 10+11keV.Msun YX500 ?=-1 The mass proxy within R500
707- 714 F8.2 10+11keV.Msun b_YX500 ?=-1 1sigma lower limit of YX500
716- 723 F8.2 10+11keV.Msun B_YX500 ?=-1 1sigma upper limit of YX500
725- 731 F7.2 10+13Msun M500 ?=-1 CLuster total mass M500
from eROCOP
733- 739 F7.2 10+13Msun b_M500 ?=-1 1sigma lower limit of M500
741- 747 F7.2 10+13Msun B_M500 ?=-1 1sigma upper limit of M500
749- 754 F6.3 --- Fgas500 ?=-1 Cluster gas mass fraction
within R500
756- 761 F6.3 --- b_Fgas500 ?=-1 1sigma lower limit of Fgas500
763- 768 F6.3 --- B_Fgas500 ?=-1 1sigma upper limit of Fgas500
770- 774 I5 kpc R500 ?=-1 Overdensity radius R500
from eROCOP
776- 780 I5 kpc b_R500 ?=-1 1sigma lower limit of R500
782- 786 I5 kpc B_R500 ?=-1 1sigma upper limit of R500
788-1027 A240 --- MatchName IDs of matched counterparts in
literature cluster catalogs
within 2" radius
1028-3627 200E13.6 --- M500PDF Probability density function of M500
(200xE13.6)
3628-6227 200E13.6 Msun M500PDFA M500 corresponding to M500PDF
(200xE13.6) (M500PDFarray)
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Note (1): Spectroscopic (cgspecz or speczboot) or photometric (photo_z)
or literature (lit_z) values (see Kluge et al., A&A subm., for details).
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Byte-by-byte Description of file: ecosmos.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 32 A32 --- DetUId Unique source ID, as in main eRASS1
X-ray catalog (Merloni et al., 2024,
Cat. J/A+A/682/A34)
34- 56 A23 --- Name Source name 1eRASS JHHMMSS.s+DDMMSS
58- 72 F15.11 deg RAdeg Right ascension (J2000)
74- 88 F15.11 deg DEdeg Declination (J2000)
90- 95 F6.4 --- zlambda Photometric redshift of the cluster
based on the LS DR10 data
97-102 F6.4 --- e_zlambda 1 sigma error of photometric redshift
104-109 F6.2 ct/s CR500 ?=-1 0.2-2.3keV count rate within R500
measured at zlambda
111-116 F6.2 ct/s b_CR500 ?=-1 1sigma lower limit of CR500
118-123 F6.2 ct/s B_CR500 ?=-1 1sigma upper limit of CR500
125-132 F8.3 ct/s CR500NH0 ?=-1 0.2-2.3keV unabsorbed count rate
within R500 at zlambda
134-141 F8.3 ct/s b_CR500NH0 ?=-1 1sigma lower limit of CR500NH0
143-152 F10.3 ct/s B_CR500NH0 ?=-1 1sigma upper limit of CR500NH0
154-159 F6.3 10-7W L500 0.2-2.3keV luminosity within R500
at zlambda
161-166 F6.3 10-7W b_L500 1sigma lower limit of L500
168-174 F7.3 10-7W B_L500 1sigma upper limit of L500
176-181 F6.3 keV KT Temperature measured by MBProj2D
at zlambda
183-188 F6.3 keV b_KT 1sigma lower limit of KT
190-196 F7.3 keV B_KT 1sigma upper limit of KT
198-204 F7.2 10+11Msun Mgas500 ?=-1 MGAS within R500 at zlambda
206-212 F7.2 10+11Msun b_Mgas500 ?=-1 1sigma lower limit of Mgas500
214-220 F7.2 10+11Msun B_Mgas500 ?=-1 1sigma upper limit of Mgas500
222-229 F8.2 10+11keV.Msun YX500 ?=-1 The mass proxy within R500
at zlambda
231-238 F8.2 10+11keV.Msun b_YX500 ?=-1 1sigma lower limit of YX500
240-247 F8.2 10+11keV.Msun B_YX500 ?=-1 1sigma upper limit of YX500
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Acknowledgements:
Esra Bulbul, ebulbul(at)mpe.mpg.de
(End) Patricia Vannier [CDS] 22-Feb-2024