2006A&A...453..847C

Query : 2006A&A...453..847C

2006A&A...453..847C - Astronomy and Astrophysics, volume 453, 847-861 (2006/7-3)

Witnessing galaxy preprocessing in the local Universe: the case of a star-bursting group falling into Abell 1367.

CORTESE L., GAVAZZI G., BOSELLI A., FRANZETTI P., KENNICUTT R.C., O'NEIL K. and SAKAI S.

Abstract (from CDS):

We present a multiwavelength analysis of a compact group of galaxies infalling at high speed into the dynamically young cluster Abell 1367. Peculiar morphologies and unusually high Hα emission are associated with two giant galaxies and at least ten dwarfs/extragalactic HII regions, making this group the region with the highest density of star formation activity ever observed in the local clusters. Moreover Hα imaging observations reveal extraordinary complex trails of ionized gas behind the galaxies, with projected lengths exceeding 150 kpc. These unique cometary trails mark the gaseous trajectory of galaxies, witnessing their dive into the hot cluster intergalactic medium. Under the combined action of tidal forces among group members and the ram-pressure by the cluster ambient medium, the group galaxies were fragmented and the ionized gas was blown out. The properties of this group suggest that environmental effects within infalling groups may have represented a preprocessing step of the galaxy evolution during the high redshift cluster assembly phase.

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Journal keyword(s): galaxies: evolution - galaxies: clusters: individual: Abell 1367 - galaxies: interactions - galaxies: intergalactic medium

Nomenclature: Table 1: [SKV2002] Dw N a (Nos 1 c, 2 a, 2 b, 2 c, 3 d, 3 e) added.

Simbad objects: 37

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Number of rows : 37
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 LEDA 36382 GiC 11 42 56.450 +19 57 58.37 15.85 16.25   15.27   ~ 103 0
2 2MFGC 9193 GiC 11 43 13.096 +20 00 17.52 15.91 16.52   15.56   ~ 105 0
3 UGC 6697 GiG 11 43 49.1088652488 +19 58 05.954438316 13.96 14.35 13.59 13.29   ~ 227 3
4 [SKV2002] K1 G 11 44 44.28 +19 48 14.0           ~ 5 0
5 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1076 1
6 [SKV2002] Dw 3 e ? 11 44 45.97 +19 47 41.1           ~ 1 0
7 [SKV2002] Dw 3 d ? 11 44 45.97 +19 47 44.4           ~ 1 0
8 [SKV2002] Dw 3 G 11 44 46.13 +19 47 37.5   19.09       ~ 5 0
9 [SKV2002] CGCG 97-114 b ? 11 44 46.36 +19 46 41.4           ~ 3 0
10 [SKV2002] Dw 3 a ? 11 44 46.39 +19 47 40.6           ~ 2 0
11 [CGI2003] J114447+194648 GiC 11 44 47.54 +19 46 48.8           ~ 4 0
12 MCG+03-30-087 H2G 11 44 47.791 +19 46 24.29 16.22 16.53   15.45   ~ 75 0
13 NGC 3860 AGN 11 44 49.1676137928 +19 47 42.121734972 14.81 14.61   13.12   ~ 112 0
14 [SKV2002] K2 b ? 11 44 49.61 +19 46 04.0           ~ 3 0
15 [GCB2003] BIG GrG 11 44 50.0 +19 48 00           ~ 21 0
16 [SKV2002] K2 a ? 11 44 50.61 +19 46 02.4           ~ 3 0
17 [SKV2002] K2 ? 11 44 50.81 +19 46 05.1           ~ 6 0
18 [SKV2002] Dw 2 GiC 11 44 51.094 +19 47 18.15 20.11 18.72   19.93   ~ 12 0
19 [SKV2002] Dw 2 c ? 11 44 51.12 +19 47 18.7           ~ 1 0
20 [SKV2002] Dw 2 b ? 11 44 51.17 +19 47 17.5           ~ 1 0
21 [SKV2002] Dw 2 a ? 11 44 51.67 +19 47 13.5           ~ 1 0
22 [SKV2002] K5 ? 11 44 51.84 +19 47 51.7           ~ 3 0
23 [SKV2002] CGCG 97-125 c ? 11 44 53.56 +19 46 32.1           ~ 2 0
24 [SKV2002] Dw 1 b ? 11 44 53.74 +19 47 31.2           ~ 2 0
25 [SKV2002] Dw 1 a ? 11 44 53.74 +19 47 31.2           ~ 2 0
26 [SKV2002] Dw 1 c ? 11 44 54.29 +19 47 28.6           ~ 1 0
27 SDSS J114454.61+194732.5 GiC 11 44 54.61776 +19 47 32.5680   18.35       ~ 11 0
28 [SKV2002] CGCG 97-125 b G 11 44 54.66 +19 46 11.5           ~ 3 0
29 2MASX J11445486+1946349 GiG 11 44 54.8372181216 +19 46 34.904680824   15.4   14.14   ~ 81 0
30 [SKV2002] K3 ? 11 44 55.28 +19 48 03.3           ~ 2 0
31 [SKV2002] CGCG 97-125 a G 11 44 56.73 +19 46 24.7           ~ 3 0
32 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1341 2
33 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6645 0
34 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4803 2
35 NAME Stephan's Quintet CGG 22 35 57.5 +33 57 36           ~ 439 1
36 NGC 7318B GiP 22 35 58.3903354632 +33 57 57.827617524   14.06   12.47   ~ 138 0
37 NAME CFA Great Wall SCG ~ ~           ~ 137 0

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