2009A&A...505..521R


Query : 2009A&A...505..521R

2009A&A...505..521R - Astronomy and Astrophysics, volume 505, 521-528 (2009/10-2)

Galaxy distribution and evolution around a sample of 2dF groups.

RIBEIRO A.L.B., TREVISAN M., LOPES P.A.A. and SCHILLING A.C.

Abstract (from CDS):

We study galaxy evolution and spatial patterns in the surroundings of a sample of 2dF groups. Our aim is to find evidence of galaxy evolution and clustering out to 10 times the virial radius of the groups and so redefine their properties according to the spatial patterns in the fields and relate them to galaxy evolution. Group members and interlopers were redefined after the identification of gaps in the redshift distribution. We then used exploratory spatial statistics based on the the second moment of the Ripley function to probe the anisotropy in the galaxy distribution around the groups. We found an important anticorrelation between anisotropy around groups and the fraction of early-type galaxies in these fields. Our results illustrate how the dynamical state of galaxy groups can be ascertained by the systematic study of their neighborhoods. This is an important achievement, since the correct estimate of the extent to which galaxies are affected by the group environment and follow large-scale filamentary structure is relevant to understanding the process of galaxy clustering and evolution in the Universe.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: interactions - galaxies: clusters: general

Nomenclature: Table 1: [RTL2009] NNN N=32 among (Nos 23-281).

Simbad objects: 32

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Number of rows : 32
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 [CMC2018b] 18 ClG 00 27 42 -30 44.7           ~ 2 0
2 [TEE2006] Group S5688 ? 00 37 42 -30 47.2           ~ 1 0
3 [TEE2006] Group S11630 ? 00 39 29 -26 31.2           ~ 1 0
4 [TEE2006] Group S11621 ? 00 40 46 -26 28.9           ~ 1 0
5 [TEE2006] Group S5399 ? 00 41 10 -29 00.2           ~ 1 0
6 [TEE2006] Group S5506 ? 00 56 41 -30 47.0           ~ 1 0
7 [TEE2006] Group S6289 ? 01 02 45 -31 55.5           ~ 1 0
8 [TEE2006] Group S6088 ? 01 10 14 -29 39.8           ~ 1 0
9 [TEE2006] Group S1271 ? 01 34 24 -32 49.4           ~ 1 0
10 [CMC2018b] 60 ClG 01 46 26 -26 38.3           ~ 2 0
11 [TEE2006] Group S12259 ? 02 08 59 -26 22.0           ~ 1 0
12 [TEE2006] Group S1467 ? 02 11 19 -33 12.0           ~ 1 0
13 [CMC2018b] 77 ClG 02 25 27 -30 03.7           ~ 2 0
14 [TEE2006] Group S12706 ? 02 48 52 -26 00.1           ~ 1 0
15 [TEE2006] Group S8069 ? 03 08 56 -31 03.1           ~ 1 0
16 [TEE2006] Group N5370 ? 10 41 41 +01 21.7           ~ 1 0
17 [TEE2006] Group N5287 ? 10 43 34 +01 33.3           ~ 1 0
18 [TEE2006] Group N5187 ? 10 46 45 +01 26.3           ~ 1 0
19 [TEE2006] Group N5124 ? 10 48 55 +00 56.2           ~ 1 0
20 [TEE2006] Group N5093 ? 10 50 19 -00 19.9           ~ 1 0
21 [TEE2006] Group N1726 ? 11 14 26 -04 00.5           ~ 1 0
22 [TEE2006] Group N7043 ? 11 39 38 -01 06.6           ~ 1 0
23 [TEE2006] Group N7234 ? 12 03 16 +00 52.9           ~ 1 0
24 [TEE2006] Group N8090 ? 12 46 08 +00 42.2           ~ 1 0
25 [TEE2006] Group N8237 ? 12 47 47 -00 12.8           ~ 1 0
26 [TEE2006] Group S8710 ? 21 52 23 -28 51.8           ~ 1 0
27 [TEE2006] Group S13573 ? 22 17 10 -26 40.4           ~ 1 0
28 [TEE2006] Group S13663 ? 22 53 51 -25 31.0           ~ 1 0
29 [TEE2006] Group S13660 ? 22 54 52 -25 54.7           ~ 1 0
30 [TEE2006] Group S10540 ? 23 29 27 -30 08.9           ~ 1 0
31 [TEE2006] Group S11007 ? 23 40 51 -30 20.3           ~ 1 0
32 [TEE2006] Group S10966 ? 23 42 18 -30 17.0           ~ 1 0

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2023.01.27-12:56:43

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