2006A&A...457...21F

Query : 2006A&A...457...21F

2006A&A...457...21F - Astronomy and Astrophysics, volume 45721-34 (2006/10-1)

ATCA observations of the galaxy cluster Abell 3921. I. Radio emission from the central merging sub-clusters.

FERRARI C., HUNSTEAD R.W., FERETTI L., MAUROGORDATO S. and SCHINDLER S.

Abstract (from CDS):

We present the analysis of our 13 and 22cm ATCA observations of the central ∼18x15arcmin2 region of the merging galaxy cluster A3921 (z=0.094). We investigated the effects of the major merger between two sub-clusters on the star formation (SF) and radio emission properties of the confirmed cluster members. The origin of SF and the nature of radio emission in cluster galaxies was investigated by comparing their radio, optical and X-ray properties. We also compared the radio source counts and the percentage of detected radio galaxies with literature data. We detected 17 radio sources above the flux density limit of 0.25mJy/beam in the central field of A3921, among which 7 are cluster members. 9 galaxies with star-forming optical spectra were observed in the collision region of the merging sub-clusters. They were not detected at radio wavelengths, giving upper limits for their star formation rate significantly lower than those typically found in late-type, field galaxies. Most of these star-forming objects are therefore really located in the high density part of the cluster, and they are not infalling field objects seen in projection at the cluster centre. Their SF episode is probably related to the cluster collision that we observe in its very central phase. None of the galaxies with post-starburst optical spectra was detected down our 2σ flux density limit, confirming that they are post-starburst and not dusty star-forming objects. We finally detected a narrow-angle tail (NAT) source associated with the second brightest cluster galaxy (BG2), whose diffuse component is a partly detached pair of tails from an earlier period of activity of the BG2 galaxy.

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Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: Abell 3921 - radio continuum: galaxies

Nomenclature: Table 3: [FHF2006] RNN (Nos R1-R17) = [FHF2006] JHHMMSS+DDMMSS N=12.

Simbad objects: 33

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Number of rows : 33
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 ACO 115 ClG 00 55 59 +26 23.2           ~ 295 1
2 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1127 1
3 ACO 3528 ClG 12 54 18.2 -29 01 16           ~ 166 1
4 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
5 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2
6 QSO B2205-636 QSO 22 08 47.2422412104 -63 25 47.490225240   18.5 18.5     ~ 32 1
7 LARCS a3921r03-1087 GiC 22 48 34.84 -64 23 39.9   19.17   17.55   ~ 3 0
8 [FHF2006] J224835-642037 Rad 22 48 35.24 -64 20 37.3     22.48 22.04   ~ 1 0
9 LEDA 323897 GiC 22 48 39.7648350840 -64 19 22.103995116   18.09 17.01 16.56 15.79 ~ 8 0
10 LEDA 100677 rG 22 48 48.79 -64 23 12.9     16.22 15.59 14.84 ~ 8 0
11 LARCS a3921r03-782 GiC 22 48 58.98 -64 21 11.8   19.04   18.28   ~ 3 0
12 [FBM2005] 215 rG 22 49 02.68 -64 27 43.5     19.60 19.45 19.41 ~ 2 0
13 LEDA 323655 rG 22 49 04.7774602464 -64 20 35.624913468   16.57 15.42 14.64 14.00 ~ 13 0
14 [FHF2006] J224904-641816 Rad 22 49 04.93 -64 18 16.2     17.21     ~ 1 0
15 LARCS a3921r03-200 GiC 22 49 11.96 -64 16 03.9   19.76   18.93   ~ 3 0
16 PMN J2249-6415 Rad 22 49 12.73 -64 15 34.0           ~ 2 0
17 LARCS a3921r03-1007 GiC 22 49 26.08 -64 23 21.4   19.87   18.82   ~ 3 0
18 LARCS a3921r03-1004 GiC 22 49 38.41 -64 23 23.8   19.66   18.76   ~ 3 0
19 [FBM2005] 81 GiC 22 49 41.10 -64 24 05.6           ~ 2 0
20 [FBM2005] 45 GiC 22 49 41.46 -64 26 24.1           ~ 2 0
21 LEDA 323780 GiC 22 49 41.5 -64 19 59   19.00   18.25   ~ 5 0
22 ACO 3921 ClG 22 49 59.0 -64 25 48           ~ 165 1
23 [FBM2005] 169 GiC 22 50 01.83 -64 22 21.8           ~ 3 0
24 PMN J2250-6424 rG 22 50 06.4313854296 -64 24 42.348145932     16.38 15.73 14.99 ~ 10 1
25 [FHF2006] J225007-642408 Rad 22 50 07.00 -64 24 08.9           ~ 1 0
26 LEDA 323851 rG 22 50 13.5 -64 19 36   18.63 17.64 17.27 16.65 ~ 5 0
27 [FHF2006] R11 Rad 22 50 26.50 -64 28 20.1     17.69   16.67 ~ 1 0
28 [FHF2006] J225035-642542 Rad 22 50 35.40 -64 25 46.8     20.56   18.22 ~ 1 0
29 [FHF2006] J225036-641608 Rad 22 50 36.62 -64 16 07.6       20.57 19.56 ~ 1 0
30 LEDA 2800365 GiC 22 50 38.1 -64 20 20   17.70 16.73 16.43 15.88 ~ 8 0
31 [FHF2006] R15 Rad 22 50 46.60 -64 16 59.4       23.22   ~ 1 0
32 [FHF2006] J225050-642720 Rad 22 50 50.62 -64 27 19.8       22.92 21.35 ~ 1 0
33 [FHF2006] J225052-642443 Rad 22 50 52.57 -64 24 43.8           ~ 1 0

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