2021A&A...647A...4G

Query : 2021A&A...647A...4G

2021A&A...647A...4G - Astronomy and Astrophysics, volume 647A, 4-4 (2021/3-1)

Discovery of a supercluster in the eROSITA Final Equatorial Depth Survey: X-ray properties, radio halo, and double relics.

GHIRARDINI V., BULBUL E., HOANG D.N., KLEIN M., OKABE N., BIFFI V., BRUGGEN M., RAMOS-CEJA M.E., COMPARAT J., OGURI M., SHIMWELL T.W., BASU K., BONAFEDE A., BOTTEON A., BRUNETTI G., CASSANO R., DE GASPERIN F., DENNERL K., GATUZZ E., GASTALDELLO F., INTEMA H., MERLONI A., NANDRA K., PACAUD F., PREDEHL P., REIPRICH T.H., ROBRADE J., ROTTGERING H., SANDERS J., VAN WEEREN R.J. and WILLIAMS W.L.

Abstract (from CDS):

Aims. We examine the X-ray, optical, and radio properties of the member clusters of a new supercluster discovered during the SRG/eROSITA Performance Verification phase.
Methods. We analyzed the 140deg² eROSITA Final Equatorial Depth Survey (eFEDS) field observed during the Performance Verification phase to a nominal depth of about 2.3ks. In this field, we detect a previously unknown supercluster consisting of a chain of eight galaxy clusters at z∼0.36. The redshifts of these members were determined through Hyper Suprime-Cam photometric measurements. We examined the X-ray morphological and dynamical properties, gas, and total mass out to R₅₀₀ of the members and compare these with the same properties of the general population of clusters detected in the eFEDS field. We further investigated the gas in the bridge region between the cluster members for a potential WHIM detection. We also used radio follow-up observations with LOFAR and uGMRT to search for diffuse emission and constrain the dynamic state of the system.
Results. We do not find significant differences between the morphological parameters and properties of the intra-cluster medium of the clusters embedded in this large-scale filament and those of the eFEDS clusters. We also provide upper limits on the electron number density and mass of the warm-hot intergalactic medium as provided by the eROSITA data. These limits are consistent with previously reported values for the detections in the vicinity of clusters of galaxies. In LOFAR and uGMRT follow-up observations of the northern part of this supercluster, we find two new radio relics and a radio halo that are the result of major merger activity in the system.
Conclusions. These early results show the potential of eROSITA to probe large-scale structures such as superclusters and the properties of their members. Our forecasts show that we will be able to detect about 450 superclusters, with approximately 3000 member clusters located in the eROSITA_DE region at the final eROSITA all-sky survey depth, enabling statistical studies of the properties of superclusters and their constituents embedded in the cosmic web.

Abstract Copyright: © V. Ghirardini et al. 2021

Journal keyword(s): galaxies: clusters: intracluster medium - galaxies: clusters: general - X-rays: galaxies: clusters - intergalactic medium

Nomenclature: [GBH2021] Supercluster N=1. Fig. 6, Table 6: [GBH2021] RSE N=1, [GBH2021] RNE N=1, [GBH2021] A (Nos A-E).

Simbad objects: 47

Full paper

View the references in ADS

Number of rows : 47

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2024	#notes
1	ACO 2744	ClG	00 14 20.03	-30 23 17.8				~	812	0
2	ACO 133	ClG	01 02 41.5	-21 52 53				~	368	1
3	ACO 222	ClG	01 37 31.1	-12 59 30				~	140	1
4	ACO 223	ClG	01 37 55.9	-12 49 11				~	122	1
5	ClG 0217+70	ClG	02 17 00.0	+70 36 00				~	31	0
6	ACO 399	ClG	02 57 56.4	+13 00 59				~	396	0
7	ACO 401	ClG	02 58 56.9	+13 34 56				~	566	0
8	NAME MS 0302+17 Supercluster	SCG	03 05 26.0	+17 17 54				~	7	0
9	ACO 520	ClG	04 54 10.1	+02 55 38				~	436	0
10	ICRF J054236.1+495107	Sy1	05 42 36.13789710	+49 51 07.2337139	18.45	17.80	17.210	~	1493	1
11	ClG J0603.3+4214	ClG	06 03.3	+42 14				~	125	0
12	ACO 3391	ClG	06 26 15.4	-53 40 52				~	202	1
13	ACO 3395	ClG	06 27 31.1	-54 23 58				~	209	0
14	3C 196	Sy1	08 13 36.0561170112	+48 13 02.644966020	18.36	17.79		~	551	2
15	ACO 665	ClG	08 30 45.2	+65 52 55				~	437	0
16	eFEDS J093431.3-002309	ClG	09 34 31.1	-00 23 07				~	7	0
17	eFEDS J093501.1+005418	ClG	09 35 00.5	+00 54 06				~	4	0
18	eFEDS J093510.7+004910	ClG	09 35 10.7	+00 49 10				~	2	0
19	[GBH2021] Supercluster	SCG	09 35	+00.5				~	1	0
20	[GBH2021] A	Rad	09 35 12.3	+00 47 40				~	1	0
21	eFEDS J093513.3+004746	ClG	09 35 13.3	+00 47 47				~	2	0
22	[GBH2021] B	Rad	09 35 13.8	+00 47 15				~	1	0
23	[GBH2021] C	Rad	09 35 15.0	+00 47 54				~	1	0
24	ACT-CL J0935.2+0048	ClG	09 35 15.2	+00 47 46				~	10	0
25	[GBH2021] E	Rad	09 35 15.3	+00 45 44				~	1	0
26	[GBH2021] RN	Rad	09 35 15.6	+00 50 01				~	2	0
27	[GBH2021] D	Rad	09 35 16.2	+00 48 00				~	1	0
28	eFEDS J093520.8+003445	ClG	09 35 19.4	+00 34 38				~	4	0
29	[GBH2021] RSE	Rad	09 35 24.5	+00 45 53				~	2	0
30	eFEDS J093543.9-000334	ClG	09 35 43.9	-00 03 35				~	1	0
31	eFEDS J093546.4-000115	ClG	09 35 46.4	-00 01 15				~	3	0
32	eFEDS J093612.7+001650	ClG	09 36 12.7	+00 16 53				~	7	0
33	NAME SHAPLEY-CENTAURUS CL	SCG	13 06.0	-33 04				~	606	0
34	ACO 1689	ClG	13 11 29.5	-01 20 28				~	1125	0
35	ACO 1750	ClG	13 30 50.44	-01 51 27.1				~	178	2
36	3C 286	Sy1	13 31 08.2883506368	+30 30 32.960091564	17.51	17.25		~	4341	2
37	NAME ACO 1758S	GrG	13 32 32.8	+50 24 48				~	64	0
38	MCXC J1332.7+5032	ClG	13 32 44.8	+50 32 24				~	107	0
39	ACO 3562	ClG	13 33 31.8	-31 40 23				~	314	1
40	ACO 1835	ClG	14 01 02.07	+02 52 43.2				~	688	1
41	3C 295	Sy2	14 11 20.6	+52 12 09	22.34	20.80	18.54	~	979	5
42	ACO 2163	ClG	16 15 46.1	-06 08 50				~	562	0
43	ACO 2256	ClG	17 03 09.4	+78 39 36				~	885	1
44	ACO 2255	ClG	17 12 50.04	+64 03 10.6				~	568	0
45	MCS J1752.0+4440	ClG	17 52 02.2	+44 40 38				~	59	0
46	NAME Sausage Cluster	ClG	22 42 53.0	+53 01 05				~	204	0
47	PSZ1 G108.18-11.53	ClG	23 22 28.2499	+48 44 29.172				~	29	0

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