2003AJ....125.2393M

Query : 2003AJ....125.2393M

2003AJ....125.2393M - Astron. J., 125, 2393-2410 (2003/May-0)

A comprehensive radio and optical study of Abell 2256: activity from an infalling group.

MILLER N.A., OWEN F.N. and HILL J.M.

Abstract (from CDS):

Abell 2256 is a nearby (z~0.06), rich cluster of galaxies with fascinating observed properties across a range of wavelengths. Long believed to represent a cluster merger, recent X-ray and optical results have suggested that in addition to the primary cluster and subcluster there is evidence for a third, poorer system. We present wide-field high-sensitivity 1.4 GHz VLA radio observations of Abell 2256 in conjunction with optical imaging and additional spectroscopy. Over 40 cluster radio galaxies are identified, with optical spectroscopy indicating the emission source (star formation or active galactic nucleus) for most of them. While the overall fraction of galaxies exhibiting radio emission is consistent with a large sample of other nearby clusters, we find an increase in the activity level of galaxies belonging to the third system (hereafter ``the Group''). Specifically, the Group has relatively more star formation than both the primary cluster and main subcluster. The position of the Group is also coincident with the observed cluster radio relic. We suggest that the Group recently (∼0.3 Gyr) merged with the primary cluster and that this merger, not the ongoing merger of the primary and the main subcluster, might be responsible for many of the unusual radio properties of Abell 2256. Furthermore, the greater star formation activity of the Group suggests that the infall of groups is an important driver of galaxy evolution in clusters.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Clusters: Individual: Name: Abell 2256 - Galaxies: Evolution - Radio Continuum

VizieR on-line data: <Available at CDS (J/AJ/125/2393): table1.dat table2.dat table3.dat>

Nomenclature: Table 1: [MOH2003] JHHMMSS.s+DDMMSS N=73.

Simbad objects: 83

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Number of rows : 83
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 4839 BiC 12 57 24.3563164776 +27 29 52.203087132 13.56 13.02 12.06     ~ 482 3
2 [MOH2003] J164757.9+785207 GiC 16 47 57.9 +78 52 07           ~ 1 0
3 2MASX J16503970+7839062 GiC 16 50 39.5663907696 +78 39 06.104737116           ~ 12 0
4 2MASX J16511142+7906041 GiC 16 51 11.4453697752 +79 06 04.230697248           ~ 1 0
5 [MOH2003] J165232.0+785703 GiC 16 52 32.0 +78 57 03           ~ 1 0
6 LEDA 2777583 GiC 16 52 52.4 +78 46 31           ~ 3 0
7 [MOH2003] J165305.9+783013 GiC 16 53 05.9 +78 30 13           ~ 1 0
8 2MASX J16531352+7844126 GiC 16 53 13.5476243328 +78 44 12.574809744           ~ 4 0
9 LEDA 2778309 GiC 16 53 33.2 +79 00 02           ~ 2 0
10 2MASX J16533408+7906205 GiC 16 53 34.2505232352 +79 06 21.057289704           ~ 3 0
11 2MASX J16540624+7837422 GiC 16 54 06.1756790712 +78 37 42.080358144           ~ 3 0
12 2MASX J16541656+7911201 GiC 16 54 16.5019294032 +79 11 20.385025872           ~ 2 0
13 2MASX J16542938+7854334 GiC 16 54 29.3167306272 +78 54 33.617339064           ~ 3 0
14 2MASX J16543609+7914575 GiC 16 54 35.8516944336 +79 14 56.896458900           ~ 1 0
15 2MASX J16545853+7908447 GiC 16 54 58.539 +79 08 44.74           ~ 4 0
16 2MASX J16553201+7832018 GiC 16 55 32.0878323216 +78 32 01.853465748           ~ 5 0
17 2MASX J16553673+7905098 GiC 16 55 36.8592056784 +79 05 10.413933000   17.21       ~ 5 0
18 2MASX J16560663+7923277 GiC 16 56 06.8097859104 +79 23 27.716011656           ~ 2 0
19 2MASX J16560931+7856356 GiC 16 56 09.5212481184 +78 56 35.628900720   17.41       ~ 5 0
20 LEDA 84782 GiC 16 56 15.9 +78 55 11           ~ 4 0
21 2MASX J16561825+7909295 GiC 16 56 18.252 +79 09 29.58           ~ 4 0
22 2MASX J16570542+7832472 GiC 16 57 05.4333943032 +78 32 47.832111276           ~ 4 0
23 LEDA 84787 rG 16 57 58.3121144088 +78 36 14.267423952   17.10       ~ 14 0
24 [RSM94] AD ClG 16 58 18.3 +78 29 34           ~ 4 0
25 2MASX J16582076+7843243 GiC 16 58 20.9947987368 +78 43 24.715602876           ~ 2 0
26 2MASX J16584688+7825211 GiC 16 58 46.8038320488 +78 25 21.481474836           ~ 11 0
27 [MOH2003] J170007.5+784952 GiC 17 00 07.5 +78 49 52           ~ 1 0
28 2MASX J17001090+7900156 GiC 17 00 11.0218475088 +79 00 15.325659612           ~ 6 0
29 2MASX J17001125+7903326 GiC 17 00 11.3726148432 +79 03 32.797581876   17.50       ~ 5 0
30 2MASX J17001599+7834256 GiC 17 00 15.8463551856 +78 34 25.468208292   15.49       ~ 6 0
31 2MASX J17002036+7833546 GiC 17 00 20.2416193704 +78 33 54.939754872           ~ 5 0
32 2MASX J17003245+7856095 GiC 17 00 32.2868392320 +78 56 09.828955104   15.71       ~ 7 0
33 LEDA 84809 GiC 17 00 52.2251220528 +78 41 21.123626136   16.78       ~ 24 0
34 2MASX J17005911+7844593 GiC 17 00 59.1636832896 +78 44 59.321366808           ~ 7 0
35 2MASX J17010019+7905083 GiC 17 01 00.194 +79 05 08.39   16.45       ~ 8 0
36 2MASX J17013453+7850467 GiC 17 01 34.5159098112 +78 50 46.583957976           ~ 3 0
37 Z 355-23 GiC 17 01 49.1984995680 +79 02 16.277532504   15.6       ~ 25 0
38 2MASX J17020727+7817300 GiC 17 02 07.2903312720 +78 17 29.891579892           ~ 11 0
39 2MASX J17021207+7851330 GiC 17 02 12.2342499624 +78 51 32.936336136           ~ 7 0
40 2MASX J17021768+7845520 GiC 17 02 17.6875270296 +78 45 51.799165092           ~ 4 0
41 2MASX J17021836+7846030 GiC 17 02 18.4659754368 +78 46 03.403335792           ~ 7 0
42 [BF76] K Rad 17 02 18.5 +78 46 03           ~ 7 0
43 [RSM94] AC ClG 17 02 46.5 +78 51 46           ~ 4 0
44 2MASX J17024658+7851460 GiC 17 02 46.7033931960 +78 51 45.738374868   17.28       ~ 6 0
45 LEDA 59495 rG 17 03 02.7991076016 +78 35 55.241646576           ~ 35 0
46 2MASX J17031051+7814408 GiC 17 03 10.7165535912 +78 14 40.371420084           ~ 4 0
47 2MASX J17032505+7820387 GiC 17 03 25.056 +78 20 38.71           ~ 3 0
48 LEDA 59513 rG 17 03 29.3857127040 +78 37 54.951103560   17.02       ~ 29 0
49 LEDA 59520 rG 17 03 30.0542270136 +78 39 54.244656504   17.57       ~ 36 0
50 2MASX J17033447+7850546 GiC 17 03 34.4617060704 +78 50 54.857044752           ~ 8 0
51 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
52 2MASX J17035665+7844437 GiC 17 03 56.5610555472 +78 44 43.554245316           ~ 7 0
53 LEDA 84835 GiC 17 04 01.9 +78 33 26           ~ 4 0
54 [MOH2003] J170414.5+792313 GiC 17 04 14.5 +79 23 13           ~ 1 0
55 2MASX J17041523+7806069 rG 17 04 15.234 +78 06 06.94           ~ 4 0
56 2MASX J17044103+7813490 GiC 17 04 40.8821452512 +78 13 48.905236272           ~ 4 0
57 MCG+13-12-019 rG 17 04 48.1038532800 +78 38 29.215836384   17       ~ 29 0
58 2MASX J17045391+7829530 GiC 17 04 53.8791257904 +78 29 53.705490180           ~ 2 0
59 2MASX J17051158+7848140 GiC 17 05 11.8181815200 +78 48 13.667615856           ~ 5 0
60 [MOH2003] J170521.8+790805 GiC 17 05 21.1 +79 08 05           ~ 2 0
61 [MOH2003] J170524.2+782200 GiC 17 05 25.15 +78 22 00.7           ~ 3 0
62 LEDA 84845 GiC 17 05 33.6376252704 +78 51 16.680593736           ~ 14 0
63 2MASX J17060067+7906431 GiC 17 06 00.5416711800 +79 06 42.870965472           ~ 5 0
64 [MOH2003] J170628.4+784915 GiC 17 06 28.2 +78 49 14           ~ 2 0
65 LEDA 84854 rG 17 06 56.2476607032 +78 41 09.149593164   17.69       ~ 17 0
66 [MOH2003] J170700.6+784123 GiC 17 07 00.3 +78 41 24           ~ 2 0
67 2MASX J17070205+7910196 GiC 17 07 02.051 +79 10 19.66           ~ 4 0
68 2MASX J17071363+7853186 GiC 17 07 13.7007406608 +78 53 18.252166956   17.20       ~ 6 0
69 2MASX J17071616+7830086 GiC 17 07 16.164 +78 30 08.65           ~ 4 0
70 2MASX J17072091+7853386 GiC 17 07 21.0004993080 +78 53 38.207729508           ~ 2 0
71 LEDA 84860 GiC 17 08 33.3960445152 +78 29 54.148061580   17.49       ~ 9 0
72 2MASX J17084910+7914306 GiC 17 08 49.0710999960 +79 14 30.859941084           ~ 3 0
73 2MASX J17085811+7850147 GiC 17 08 57.9998678688 +78 50 14.927120916   17.09       ~ 6 0
74 [RSM94] AE ClG 17 09 00.5 +78 46 17           ~ 4 0
75 2MASX J17090103+7846187 GiC 17 09 01.0247134176 +78 46 18.780664620   17.56       ~ 10 0
76 2MASX J17090975+7852317 GiC 17 09 09.9061888512 +78 52 31.797498612           ~ 14 0
77 2MASX J17094398+7806057 GiC 17 09 44.1592673040 +78 06 05.932413324           ~ 4 0
78 2MASX J17101453+7839256 GiC 17 10 14.3499059040 +78 39 25.219472508   15.72       ~ 6 0
79 [MOH2003] J171015.9+780207 G 17 10 15.9 +78 02 07           ~ 2 0
80 2MASX J17103123+7829094 GiC 17 10 31.4584576104 +78 29 09.758907204           ~ 10 0
81 2MASX J17104870+7832178 GiC 17 10 48.7474649904 +78 32 17.552038776           ~ 5 0
82 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0
83 2MASX J17135716+7859328 GiC 17 13 57.1273894056 +78 59 32.788525092           ~ 5 0

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