2022A&A...661A..10B


Query : 2022A&A...661A..10B

2022A&A...661A..10B - Astronomy and Astrophysics, volume 661A, 10-10 (2022/5-1)

The eROSITA Final Equatorial-Depth Survey (eFEDS). Galaxy clusters and groups in disguise.

BULBUL E., LIU A., PASINI T., COMPARAT J., HOANG D.N., KLEIN M., GHIRARDINI V., SALVATO M., MERLONI A., SEPPI R., WOLF J., ANDERSON S.F., BAHAR Y.E., BRUSA M., BRUGGEN M., BUCHNER J., DWELLY T., IBARRA-MEDEL H., IDER CHITHAM J., LIU T., NANDRA K., RAMOS-CEJA M.E., SANDERS J.S. and SHEN Y.

Abstract (from CDS):


Aims. The eROSITA Final Equatorial-Depth Survey (eFEDS), executed during the performance verification phase of the Spectrum-Roentgen-Gamma (SRG)/eROSITA telescope, was completed in November 2019. One of the science goals of this survey is to demonstrate the ability of eROSITA to detect samples of clusters and groups at the final depth of the eROSITA all-sky survey.
Methods. Because of the sizeable (~=26'' HEW FOV average) point-spread function of eROSITA, high-redshift clusters of galaxies or compact nearby groups hosting bright active galactic nuclei (AGN) can be misclassified as point sources by the source detection algorithms. A total of 346 galaxy clusters and groups in the redshift range of 0.1 < z < 1.3 were identified based on their red sequenc in the eFEDS point source catalog.
Results. We examine the multiwavelength properties of these clusters and groups to understand the potential biases in our selection process and the completeness of the extent-selected sample. We find that the majority of the clusters and groups in the point source sample are indeed underluminous and compact compared to the extent-selected sample. Their faint X-ray emission, well below the flux limit of the extent-selected eFEDS clusters, and their compact X-ray emission are likely to be the main reason for this misclassification. In the sample, we confirm that 10% of the sources host AGN in their brightest cluster galaxies (BCGs) through optical spectroscopy and visual inspection. By studying their X-ray, optical, infrared, and radio properties, we establish a method for identifying clusters and groups that host AGN in their BCGs. We successfully test this method on the current point source catalog through the Sloan Digital Sky Survey optical spectroscopy and find eight low-mass clusters and groups with active radio-loud AGN that are particularly bright in the infrared. They include eFEDS J091437.8+024558, eFEDS J083520.1+012516, and eFEDS J092227.1+043339 at redshifts 0.3-0.4.
Conclusions. This study helps us to characterize and understand our selection process and assess the completeness of the eROSITA extent-selected samples. The method we developed will be used to identify high-redshift clusters, AGN-dominated groups, and low-mass clusters that are misclassified in the future eROSITA all-sky survey point source catalogs.

Abstract Copyright: © E. Bulbul et al. 2022

Journal keyword(s): galaxies: clusters: general - X-rays: galaxies: clusters - galaxies: groups: general

VizieR on-line data: <Available at CDS (J/A+A/661/A10): clusters.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ACT-CL J0102-4915 ClG 01 02 52.50 -49 14 58.0           ~ 192 0
2 ACO 262 ClG 01 52 50.4 +36 08 46           ~ 677 1
3 ZwCl 0735+7421 ClG 07 41 40.3 +74 14 58     17.70     ~ 236 0
4 3C 186 QSO 07 44 17.4720658920 +37 53 17.250697320   17.5 18.14 17.2   ~ 303 1
5 PSZ2 G233.68+36.14 C?G 09 35 15.2 +00 47 46           ~ 5 0
6 PSZ2 G317.79+26.63 ClG 13 56 05.40 -34 21 10.9           ~ 6 0
7 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 657 1
8 NGC 5813 LIN 15 01 11.2302420864 +01 42 07.141569696 12.00 11.45 10.46 10.06   ~ 608 1
9 ACO 2052 ClG 15 16 45.5 +07 00 01           ~ 703 1
10 NAME LHB X 16 42.0 +02 19           ~ 296 0
11 [SMG2021] CHIPS J1911+4455 C?G 19 11 01.00 +44 55 20.0           ~ 4 0
12 ClG J1931-2635 ClG 19 31 49.6 -26 34 33           ~ 144 0
13 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 519 0
14 NAME Phoenix Cluster ClG 23 44 40.9 -42 41 54           ~ 156 0
15 ACO 4059 ClG 23 56 40.7 -34 40 18           ~ 368 1

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2022.08.09-15:47:00

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