2012A&A...547A..44B

Query : 2012A&A...547A..44B

2012A&A...547A..44B - Astronomy and Astrophysics, volume 547A44-44 (2012/11-1)

Structure of Abell 1995 from optical and X-ray data: a galaxy cluster with an elongated radio halo.

BOSCHIN W., GIRARDI M. and BARRENA R.

Abstract (from CDS):

Abell 1995 is a puzzling galaxy cluster hosting a powerful radio halo, but it has not yet been recognized as a obvious cluster merger, as usually expected for clusters with diffuse radio emission. We aim at an exhaustive analysis of the internal structure of Abell 1995 to verify that this cluster is really dynamically relaxed, as reported in previous studies.We base our analysis on new and archival spectroscopic and photometric data for 126 galaxies in the field of Abell 1995. The study of the hot intracluster medium was performed on X-ray archival data.Based on 87 fiducial cluster members, we have computed the average cluster redshift <z≥0.322 and the global radial velocity dispersion σ_V∼1300km/s. We detect two main optical subclusters separated by 1.5' that cause the known NE-SW elongation of the galaxy distribution and a significant velocity gradient in the same direction. As for the X-ray analysis, we confirm that the intracluster medium is mildly elongated, but we also detect three X-ray peaks. Two X-ray peaks are offset with respect to the two galaxy peaks and lie between them, thus suggesting a bimodal merger caught in a phase of post core-core passage. The third X-ray peak lies between the NE galaxy peak and a third, minor galaxy peak suggesting a more complex merger. The difficulty of separating the two main systems leads to a large uncertainty on the line-of-sight (LOS) velocity separation and the system mass: ΔV_rf,LOS=600-2000km/s and M_sys=2-5x10¹⁵h₇₀^–1M_☉, respectively. Simple analytical arguments suggest a merging scenario for Abell 1995, where two main subsystems are seen just after the collision with an intermediate projection angle.The high mass of Abell 1995 and the evidence of merging suggest it is not atypical among clusters with known radio halos. Interestingly, our findings reinforce the previous evidence for the peculiar dichotomy between the dark matter and galaxy distributions observed in this cluster.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: individual: Abell 1995 - galaxies: clusters: general - galaxies: kinematics and dynamics - X-rays: galaxies: clusters

VizieR on-line data: <Available at CDS (J/A+A/547/A44): table1.dat>

Nomenclature: Table 1: [BGB2012b] NNN (Nos 1-126).

Simbad objects: 134

Full paper

View the references in ADS

Number of rows : 134

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2026	#notes
1	ZwCl 0024+1652	ClG	00 26 35.6	+17 09 32		18.35		~	648	1
2	ClG J0152-1358	ClG	01 52 41.3	-13 58 13				~	262	3
3	ACO 520	ClG	04 54 10.1	+02 55 38				~	465	0
4	ACO 523	ClG	04 59 01	+08 46.5				~	66	0
5	ClG 0657-56	ClG	06 58 26.9	-55 58 21				~	1077	1
6	ClG 1054-03	ClG	10 57 00.2	-03 37 27		22		~	458	0
7	[BGB2012b] 1	G	14 52 18.172	+58 01 33.22	19.18		18.16	~	1	0
8	[BGB2012b] 2	G	14 52 24.136	+58 00 27.77	22.31		21.18	~	1	0
9	[BGB2012b] 3	G	14 52 26.337	+58 02 33.63	20.50		18.75	~	1	0
10	[BGB2012b] 4	G	14 52 30.803	+58 02 58.14	19.45		18.40	~	1	0
11	[BGB2012b] 5	G	14 52 33.018	+58 02 27.43	22.62		20.09	~	1	0
12	[BGB2012b] 6	G	14 52 33.135	+58 00 14.11	22.75		20.38	~	1	0
13	[BGB2012b] 7	G	14 52 33.185	+57 59 33.35	22.93		20.35	~	1	0
14	[BGB2012b] 8	G	14 52 34.381	+57 59 54.72	22.77		21.41	~	1	0
15	[BGB2012b] 9	G	14 52 34.919	+58 00 40.64	22.54		19.91	~	1	0
16	[BGB2012b] 10	G	14 52 36.177	+58 00 40.67	21.77		20.36	~	1	0
17	[BGB2012b] 11	G	14 52 36.542	+58 00 45.01	22.42		20.11	~	1	0
18	[BGB2012b] 12	G	14 52 37.795	+58 01 26.88	21.99		19.96	~	1	0
19	[BGB2012b] 13	G	14 52 38.141	+57 59 15.67	22.67		20.78	~	1	0
20	[BGB2012b] 14	G	14 52 39.093	+58 00 54.31	22.82		21.22	~	1	0
21	[BGB2012b] 15	G	14 52 39.853	+58 02 28.42	23.42		20.93	~	1	0
22	[BGB2012b] 16	G	14 52 40.809	+57 59 19.43	23.29		21.42	~	1	0
23	[BGB2012b] 17	G	14 52 40.900	+58 00 14.64	22.36		19.50	~	1	0
24	[BGB2012b] 18	G	14 52 41.054	+58 03 38.19	22.07		19.58	~	1	0
25	[BGB2012b] 19	G	14 52 41.491	+58 04 02.32	22.62		20.15	~	1	0
26	[BGB2012b] 20	G	14 52 42.234	+57 59 29.40	23.54		20.83	~	1	0
27	[BGB2012b] 21	G	14 52 42.715	+58 00 41.23	22.95		20.43	~	1	0
28	[BGB2012b] 22	G	14 52 43.551	+58 03 03.63	21.82		19.85	~	1	0
29	SDSS J145243.76+580129.4	BiC	14 52 43.7638431648	+58 01 29.440380936	21.29		18.81	~	2	0
30	[BGB2012b] 24	G	14 52 45.078	+58 03 13.05	22.27		19.72	~	1	0
31	[BGB2012b] 25	G	14 52 46.382	+58 01 12.31	21.82		19.50	~	1	0
32	[BGB2012b] 26	G	14 52 46.553	+58 01 36.57	23.31		20.62	~	1	0
33	[BGB2012b] 27	G	14 52 47.260	+58 01 57.05	22.04		19.45	~	1	0
34	[BGB2012b] 28	G	14 52 47.448	+58 01 36.93	22.52		19.76	~	1	0
35	[BGB2012b] 30	GiC	14 52 47.8482011376	+58 02 00.912906924	21.73		19.37	~	2	0
36	[BGB2012b] 29	G	14 52 47.850	+58 01 09.99	22.66		21.46	~	1	0
37	[BGB2012b] 31	G	14 52 48.8686484280	+58 04 39.229835340	20.17		18.99	~	1	0
38	[BGB2012b] 32	G	14 52 48.987	+58 01 48.13	23.16		20.54	~	1	0
39	[BGB2012b] 33	G	14 52 49.195	+58 02 18.52	22.50		19.87	~	1	0
40	[BGB2012b] 34	G	14 52 49.900	+58 00 26.28	20.80		19.18	~	1	0
41	[BGB2012b] 35	G	14 52 50.108	+58 01 26.89	21.37		18.88	~	1	0
42	[BGB2012b] 36	G	14 52 50.352	+58 01 50.67	23.05		20.32	~	1	0
43	[BGB2012b] 37	G	14 52 50.669	+58 04 05.64	23.84		20.76	~	1	0
44	[BGB2012b] 38	G	14 52 51.173	+58 02 04.38	22.37		19.68	~	1	0
45	[BGB2012b] 39	G	14 52 51.383	+58 02 36.37	21.99		19.84	~	1	0
46	[BGB2012b] 41	GiC	14 52 51.950	+58 02 09.97	21.93		19.29	~	2	0
47	[BGB2012b] 40	G	14 52 51.9518363928	+58 02 33.112178016	22.00		19.21	~	1	0
48	CXOU J145251.9+580046	G	14 52 52.024	+58 00 45.89	23.46		21.36	~	2	0
49	[BGB2012b] 43	G	14 52 52.44	+58 00 49.1	22.82		21.37	~	1	0
50	[BGB2012b] 44	G	14 52 52.570	+58 05 01.00	22.33		19.81	~	1	0
51	[BGB2012b] 45	G	14 52 52.806	+58 04 38.49	21.34		19.95	~	1	0
52	[BGB2012b] 46	G	14 52 52.9335183480	+58 02 40.327958472	20.89		18.79	~	1	0
53	[BGB2012b] 47	G	14 52 52.968	+58 03 00.54	20.70		18.81	~	1	0
54	[BGB2012b] 48	GiC	14 52 53.3155774080	+58 02 17.609677656	21.96		19.43	~	2	0
55	[BGB2012b] 50	G	14 52 53.794	+58 01 54.12	20.28		19.22	~	1	0
56	[BGB2012b] 49	G	14 52 53.835	+57 59 34.02	21.54		19.24	~	1	0
57	[BGB2012b] 51	G	14 52 53.975	+58 00 56.72	20.47		19.15	~	1	0
58	[BGB2012b] 52	G	14 52 54.187	+58 01 18.99	21.60		20.46	~	1	0
59	ACO 1995	ClG	14 52 55.0	+58 02 59				~	140	0
60	[BGB2012b] 53	G	14 52 55.152	+58 03 12.73	23.47		20.85	~	1	0
61	[BGB2012b] 54	G	14 52 56.195	+58 02 54.93	21.70		19.28	~	1	0
62	[BGB2012b] 56	G	14 52 56.293	+57 59 56.15	21.47		19.84	~	1	0
63	[BGB2012b] 55	G	14 52 56.307	+58 02 38.79	23.03		20.30	~	1	0
64	[BGB2012b] 57	G	14 52 56.674	+58 03 15.34	23.15		20.55	~	1	0
65	[BGB2012b] 58	GiC	14 52 57.165	+58 02 31.62	20.91		18.60	~	2	0
66	[BGB2012b] 59	G	14 52 57.351	+58 02 34.94	22.60		20.99	~	1	0
67	2MASX J14525739+5802543	BiC	14 52 57.393	+58 02 54.39	20.32		17.78	~	6	0
68	[BGB2012b] 62	GiC	14 52 57.639	+58 02 06.42	21.89		19.23	~	2	0
69	[BGB2012b] 63	G	14 52 57.805	+58 04 49.49	21.96		19.58	~	1	0
70	[BGB2012b] 64	G	14 52 58.076	+58 03 29.59	22.00		19.27	~	1	0
71	[BGB2012b] 65	G	14 52 58.204	+58 02 51.97	22.21		19.54	~	1	0
72	[BGB2012b] 66	GiC	14 52 58.370	+58 03 46.42	21.38		19.09	~	2	0
73	[BGB2012b] 67	G	14 52 58.619	+58 01 54.87	22.91		20.45	~	1	0
74	[BGB2012b] 68	G	14 52 59.596	+58 03 35.95	23.53		21.02	~	1	0
75	[BGB2012b] 69	G	14 52 59.869	+58 02 52.90	22.55		19.73	~	1	0
76	[BGB2012b] 70	G	14 52 59.900	+58 06 09.88	23.94		20.83	~	1	0
77	[CGH98] J1453+5803	Rad	14 53 00.4	+58 03 11				~	2	0
78	[BGB2012b] 71	GiC	14 53 00.4572041376	+58 03 18.416917872	21.25		18.79	~	2	0
79	[BGB2012b] 72	G	14 53 00.480	+58 05 54.81	23.26		20.79	~	1	0
80	[BGB2012b] 73	G	14 53 01.009	+58 01 59.55	22.79		20.70	~	1	0
81	[BGB2012b] 74	G	14 53 01.0500149472	+58 00 23.075827992	21.93		19.16	~	1	0
82	[BGB2012b] 75	G	14 53 01.182	+58 06 15.29	22.62		19.92	~	1	0
83	[BGB2012b] 76	GiC	14 53 01.422	+58 03 24.66	20.99		18.55	~	2	0
84	[BGB2012b] 77	G	14 53 01.667	+58 04 19.48	23.52		21.00	~	1	0
85	[BGB2012b] 78	G	14 53 01.810	+58 04 07.85	23.78		20.93	~	1	0
86	[BGB2012b] 79	G	14 53 01.853	+58 05 21.75	22.93		20.68	~	1	0
87	[BGB2012b] 80	GiC	14 53 02.222	+58 03 46.50	21.82		19.52	~	2	0
88	[BGB2012b] 81	GiC	14 53 02.2906322688	+58 02 49.178112972	22.00		19.42	~	2	0
89	[BGB2012b] 82	G	14 53 02.727	+58 03 34.86	21.90		19.74	~	1	0
90	[BGB2012b] 83	G	14 53 03.667	+58 03 48.41	22.40		19.90	~	1	0
91	[BGB2012b] 84	GiC	14 53 03.720	+58 03 33.18	21.96		19.31	~	2	0
92	[BGB2012b] 85	GiC	14 53 04.023	+58 04 03.64	21.37		18.86	~	2	0
93	[BGB2012b] 86	GiC	14 53 04.331	+58 03 39.43	22.35		19.82	~	2	0
94	[BGB2012b] 87	G	14 53 04.404	+58 03 07.23	22.00		19.31	~	1	0
95	[BGB2012b] 88	G	14 53 04.560	+58 04 02.20	22.79		20.46	~	1	0
96	SDSS J145305.86+580308.6	QSO	14 53 05.8591677072	+58 03 08.570068704	19.4		19.2	~	12	0
97	[BGB2012b] 90	G	14 53 05.957	+58 04 29.97	22.92		20.53	~	1	0
98	[BGB2012b] 91	G	14 53 06.892	+57 59 57.48	21.79		20.85	~	1	0
99	[BGB2012b] 92	G	14 53 07.483	+58 04 03.00	23.20		20.66	~	1	0
100	[BGB2012b] 93	G	14 53 07.767	+58 04 47.44	23.60		20.97	~	1	0
101	[BGB2012b] 94	G	14 53 08.289	+58 04 26.28	22.50		19.90	~	1	0
102	[BGB2012b] 95	G	14 53 10.302	+58 02 15.14	23.15		20.62	~	1	0
103	[BGB2012b] 96	G	14 53 10.610	+58 05 08.65	22.54		19.86	~	1	0
104	[BGB2012b] 97	G	14 53 11.476	+58 04 24.10	22.33		19.94	~	1	0
105	[BGB2012b] 98	G	14 53 13.131	+58 05 10.31	23.59		20.86	~	1	0
106	[BGB2012b] 101	G	14 53 13.783	+58 07 19.76	23.06		20.78	~	1	0
107	[BGB2012b] 100	G	14 53 13.788	+58 05 23.04	23.68		21.01	~	1	0
108	[BGB2012b] 99	G	14 53 13.801	+58 03 27.50	22.23		19.63	~	1	0
109	[BGB2012b] 102	G	14 53 14.069	+58 03 04.21	23.06		20.27	~	1	0
110	[BGB2012b] 103	G	14 53 14.130	+58 03 40.64	22.83		20.13	~	1	0
111	[BGB2012b] 104	G	14 53 14.542	+58 00 24.14	23.73		20.97	~	1	0
112	[BGB2012b] 105	G	14 53 14.638	+58 05 39.31	23.07		20.66	~	1	0
113	[BGB2012b] 107	G	14 53 14.736	+58 02 25.60	22.97		21.42	~	1	0
114	[BGB2012b] 106	G	14 53 14.743	+58 07 14.43	22.81		20.26	~	1	0
115	[BGB2012b] 108	G	14 53 14.892	+58 06 31.85	22.89		20.19	~	1	0
116	[BGB2012b] 109	G	14 53 15.711	+58 02 57.45	22.92		20.75	~	1	0
117	[BGB2012b] 110	G	14 53 16.385	+58 00 51.90	21.90		19.37	~	1	0
118	[BGB2012b] 111	G	14 53 16.8762696432	+58 02 41.992097100	20.95		19.13	~	1	0
119	[BGB2012b] 112	G	14 53 18.125	+58 02 20.84	22.24		19.74	~	1	0
120	[BGB2012b] 113	G	14 53 18.333	+58 03 40.30	22.88		20.39	~	1	0
121	[BGB2012b] 114	G	14 53 19.958	+58 03 22.16	21.99		19.87	~	1	0
122	[BGB2012b] 115	G	14 53 20.8678214496	+58 04 12.123526656	21.88		19.35	~	1	0
123	[BGB2012b] 116	G	14 53 23.885	+58 05 02.64	23.14		20.75	~	1	0
124	[BGB2012b] 117	G	14 53 23.899	+58 03 35.67	22.85		20.26	~	1	0
125	[BGB2012b] 118	G	14 53 25.422	+58 04 06.02	22.16		19.78	~	1	0
126	[BGB2012b] 119	G	14 53 26.222	+58 05 16.75	22.98		20.44	~	1	0
127	[BGB2012b] 120	G	14 53 28.872	+58 04 07.31	22.04		19.55	~	1	0
128	[BGB2012b] 121	G	14 53 29.267	+58 05 01.80	23.51		20.81	~	1	0
129	[BGB2012b] 122	G	14 53 30.544	+58 05 18.76	21.11		19.51	~	1	0
130	[BGB2012b] 123	G	14 53 31.727	+58 03 04.06	22.03		19.32	~	1	0
131	[BGB2012b] 124	G	14 53 32.495	+58 03 27.18	22.41		19.77	~	1	0
132	[BGB2012b] 125	G	14 53 33.024	+58 04 06.31	22.03		19.26	~	1	0
133	[BGB2012b] 126	G	14 53 37.640	+58 03 17.69	22.10		19.65	~	1	0
134	ACO 2294	ClG	17 24 10.1	+85 53 09				~	69	0

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