2012MNRAS.427.1252M

Query : 2012MNRAS.427.1252M

2012MNRAS.427.1252M - Mon. Not. R. Astron. Soc., 427, 1252-1265 (2012/December-1)

Plunging fireworks: why do infalling galaxies light up on the outskirts of clusters?

MAHAJAN S., RAYCHAUDHURY S. and PIMBBLET K.A.

Abstract (from CDS):

Integrated star formation rate (SFR) and specific star formation rate (SFR/M*), derived from the spectroscopic data obtained by the Sloan Digital Sky Survey (SDSS) data release 4 (DR4), are used to show that the star formation activity in galaxies (Mr ≤ -20.5) found on the outskirts (1–2r200) of some nearby clusters (0.02 ≤ z ≤ 0.15) is enhanced. By comparing the mean SFR of galaxies in a sample of clusters with at least one starburst galaxy (log SFR/M* ≥ -10/yr and SFR ≥ 10 M☉/yr) to a sample of clusters without such galaxies (`comparison' clusters), we find that despite the expected decline in the mean SFR of galaxies towards the cluster core, the SFR profile of the two samples is different. Compared to the clusters with at least one starburst galaxy on their outskirts, the galaxies in the `comparison' clusters show a lower mean SFR at all radius ( ≤ 3r200) from the cluster centre. Such an increase in the SFR of galaxies is more likely to be seen in dynamically unrelaxed (σv ≳ 500km/s) clusters. It is also evident that these unrelaxed clusters are currently being assembled via galaxies falling in through straight filaments, resulting in high velocity dispersions. On the other hand, `comparison' clusters are more likely to be fed by relatively low density filaments. We find that the starburst galaxies on the periphery of clusters are in an environment of higher local density than other cluster galaxies at similar radial distances from the cluster centre. We conclude that a relatively high galaxy density in the infalling regions of clusters promotes interactions amongst galaxies, leading to momentary bursts of star formation. Such interactions play a crucial role in exhausting the fuel for star formation in a galaxy, before it is expelled due to the environmental processes that are operational in the dense interiors of the cluster.

Abstract Copyright: © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS

Journal keyword(s): galaxies: clusters: general - galaxies: evolution - galaxies: starburst - cosmology: observations - large-scale structure of Universe

CDS comments: In introduction : Galaxy C153 = [DO99] ACO 2125 32

Simbad objects: 120

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Number of rows : 120
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 2744 ClG 00 14 20.03 -30 23 17.8           ~ 1077 0
2 ZwCl 0024+1652 ClG 00 26 35.6 +17 09 32     18.35     ~ 648 1
3 ACO 152 ClG 01 10 09.08 +14 00 33.9           ~ 43 0
4 ACO 175 ClG 01 19 31.73 +14 53 29.3           ~ 43 0
5 ACO 190 ClG 01 23 41 -09 51.4           ~ 16 0
6 2XMM J045400.6-030832 GrG 04 54 00.6 -03 08 32           ~ 12 0
7 ACO 612 ClG 08 00 56.44 +34 36 40.6           ~ 24 0
8 ACO 628 ClG 08 10 06.32 +35 15 54.8           ~ 46 0
9 ACO 646 ClG 08 22 10.0 +47 05 58           ~ 102 1
10 ACO 655 ClG 08 25 16.12 +47 09 34.2           ~ 118 0
11 ACO 667 ClG 08 28 05.8 +44 46 00           ~ 45 0
12 ACO 671 ClG 08 28 48.68 +30 27 07.0           ~ 168 0
13 ACO 690 ClG 08 39 14.34 +28 48 47.0           ~ 81 0
14 ACO 695 ClG 08 41 13.09 +32 24 59.7           ~ 44 0
15 ACO 714 ClG 08 54 37.91 +41 55 15.5           ~ 17 0
16 ACO 724 ClG 08 58 24.12 +38 30 05.7           ~ 22 0
17 ACO 775 ClG 09 16 24.86 +05 53 14.1           ~ 15 0
18 ACO 819 ClG 09 32 17.12 +09 40 45.1           ~ 29 0
19 ACO 858 ClG 09 43 25.57 +05 54 57.2           ~ 36 0
20 ACO 856 ClG 09 45 28.8 +56 32 53           ~ 14 0
21 ACO 874 ClG 09 50 37 +58 02.0           ~ 4 0
22 ACO 941 ClG 10 09 41 +03 41.2           ~ 12 0
23 ACO 971 ClG 10 19 52.08 +40 59 18.4           ~ 53 0
24 ACO 975 ClG 10 22 39 +64 37.8           ~ 22 0
25 ACO 990 ClG 10 23 39.46 +49 08 19.6           ~ 88 0
26 ACO 1004 ClG 10 25 35.26 +51 05 54.3           ~ 19 1
27 ACO 1024 ClG 10 28 22.84 +03 45 52.4           ~ 34 0
28 ACO 1021 ClG 10 29.0 +37 40           ~ 15 0
29 ACO 1038 ClG 10 32 57.39 +02 14 44.3           ~ 10 0
30 ACO 1064 ClG 10 38 36.55 +01 17 47.8           ~ 16 1
31 ACO 1068 ClG 10 40 47.1 +39 57 19           ~ 232 0
32 ACO 1080 ClG 10 43 51.98 +01 03 44.8           ~ 15 0
33 ACO 1076 ClG 10 45 20.88 +58 11 04.1           ~ 20 0
34 ACO 1139 ClG 10 58 01.63 +01 38 05.4           ~ 162 3
35 ACO 1132 ClG 10 58 32.05 +56 47 14.2           ~ 145 1
36 ACO 1171 ClG 11 07 26.37 +02 59 28.4           ~ 31 0
37 ACO 1169 ClG 11 07 55.69 +43 55 41.7           ~ 45 0
38 ACO 1173 ClG 11 09 14.40 +41 32 53.8           ~ 39 0
39 ACO 1190 ClG 11 11 43.83 +40 51 43.5           ~ 145 0
40 ACO 1205 ClG 11 13 23.41 +02 30 42.8           ~ 74 0
41 ACO 1225 ClG 11 21 19 +53 45.6           ~ 30 0
42 ACO 1227 ClG 11 21 33.58 +48 02 24.4           ~ 52 0
43 ACO 1238 ClG 11 22 05.37 +00 47 03.0           ~ 91 0
44 NAME Coma Supercluster SCG 11 23 +23.9           ~ 291 0
45 ACO 1270 ClG 11 29 08.84 +54 06 55.4           ~ 51 0
46 ACO 1302 ClG 11 33 12.02 +66 22 26.9           ~ 81 0
47 ACO 1318 ClG 11 36 13.01 +55 00 34.3           ~ 90 0
48 ACO 1341 ClG 11 40 34 +10 23.4           ~ 17 0
49 ACO 1342 ClG 11 40 40 +10 04.4           ~ 17 0
50 ACO 1346 ClG 11 41 11.24 +05 45 22.6           ~ 75 0
51 ACO 1354 ClG 11 42 06.3 +10 08 52           ~ 29 1
52 ACO 1364 ClG 11 43 39.67 -01 44 41.8           ~ 61 0
53 ACO 1361 ClG 11 43 45.85 +46 20 51.8           ~ 96 0
54 ACO 1368 ClG 11 44 53.81 +51 16 01.1           ~ 19 0
55 ACO 1373 ClG 11 45 26.70 -02 24 48.0           ~ 26 0
56 ACO 1372 ClG 11 45 28 +11 31.3           ~ 21 0
57 ACO 1377 ClG 11 47 18.24 +55 43 29.1           ~ 148 1
58 ACO 1385 ClG 11 47 28.04 +11 43 03.6           ~ 36 0
59 ACO 1383 ClG 11 48 06.73 +54 37 58.7           ~ 74 0
60 ACO 1387 ClG 11 48 58.25 +51 35 05.4           ~ 31 0
61 ACO 1390 ClG 11 49 24.73 +12 18 34.9           ~ 26 0
62 ACO 1402 ClG 11 52 32 +60 25.3           ~ 16 1
63 ACO 1424 ClG 11 57 30.50 +05 05 24.5           ~ 68 0
64 ACO 1446 ClG 12 01 54.77 +58 01 40.7           ~ 104 1
65 ACO 1452 ClG 12 03 32.23 +51 43 34.9           ~ 77 0
66 ACO 1496 ClG 12 13 35.838 +59 21 10.99           ~ 41 0
67 ACO 1518 ClG 12 19 09.33 +63 31 42.1           ~ 18 0
68 ACO 1534 ClG 12 24 42.759 +61 28 14.61           ~ 25 0
69 ACO 1544 ClG 12 27 38.72 +63 22 53.9           ~ 38 0
70 ACO 1552 ClG 12 29 46.18 +11 44 32.3           ~ 109 0
71 M 49 Sy2 12 29 46.8 +08 00 01   13.21 12.17     ~ 2174 2
72 Z 42-135 LSB 12 30 00.350 +07 55 47.44   15.4       ~ 140 0
73 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
74 ACO 1559 ClG 12 33 07.55 +67 08 47.3           ~ 57 0
75 ACO 1564 ClG 12 35 01.95 +01 47 54.4           ~ 35 0
76 ACO 1566 ClG 12 35 12.60 +64 22 41.3           ~ 26 0
77 ACO 1577 ClG 12 37 55.38 -00 16 29.7           ~ 22 0
78 ACO 1621 ClG 12 48 39.55 +62 40 45.7           ~ 26 0
79 ACO 1630 ClG 12 52 03.13 +04 34 28.5           ~ 44 0
80 ACO 1637 ClG 12 53 56 +50 48.7           ~ 10 0
81 ACO 1646 ClG 12 55 58.80 +62 08 48.4           ~ 24 0
82 ACO 1650 ClG 12 58 42.0 -01 45 45           ~ 325 0
83 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
84 ACO 1663 ClG 13 02 52.55 -02 31 04.0           ~ 112 0
85 NAME Shapley Supercluster SCG 13 06.0 -33 04           ~ 677 0
86 ACO 1713 ClG 13 19 09 +58 04.3           ~ 12 0
87 ACO 1738 ClG 13 25 18.98 +57 35 25.9           ~ 45 0
88 ACO 1750 ClG 13 30 50.44 -01 51 27.1           ~ 190 2
89 ACO 1764 ClG 13 34 41 +59 54.7           ~ 19 0
90 ACO 1763 ClG 13 35 20.1 +41 00 04           ~ 335 0
91 ACO 1773 ClG 13 42 22.53 +02 15 14.2           ~ 119 0
92 ACO 1780 ClG 13 44 39.38 +02 53 41.6           ~ 52 0
93 ACO 1885 ClG 14 13 43.73 +43 39 45.0           ~ 75 0
94 ACO 1882 ClG 14 14 24.02 -00 22 39.9           ~ 47 0
95 ACO 1896 ClG 14 18 40 +37 47.2           ~ 6 0
96 ACO 1918 ClG 14 25 22.7 +63 11 14           ~ 71 0
97 ACO 1920 ClG 14 27 25.25 +55 45 13.5           ~ 46 0
98 ACO 1936 ClG 14 34 20.34 +54 48 13.4           ~ 22 0
99 ACO 1999 ClG 14 54 05.14 +54 16 39.0           ~ 35 0
100 ACO 2018 ClG 15 01 17.59 +47 16 30.2           ~ 66 0
101 ACO 2026 ClG 15 08 26.06 -00 16 14.4           ~ 55 0
102 ACO 2046 ClG 15 12 37.7 +34 51 35           ~ 20 0
103 ACO 2051 ClG 15 16 47.15 -01 00 32.8           ~ 68 0
104 ACO 2053 ClG 15 17 16 -00 41.0           ~ 18 0
105 ACO 2062 ClG 15 21 41.40 +32 07 08.8           ~ 34 0
106 ACO 2110 ClG 15 39 39.82 +30 42 27.9           ~ 83 0
107 BOW ACO 2125 CC033 rG 15 41 09.74 +66 15 45.0           ~ 23 0
108 ACO 2125 ClG 15 41 14.1 +66 15 57           ~ 124 1
109 ACO 2142 ClG 15 58 26.5 +27 13 52           ~ 825 0
110 ACO 2149 ClG 16 00 53.08 +53 56 57.6           ~ 79 0
111 ACO 3627 ClG 16 14 22.5 -60 52 07           ~ 340 2
112 ACO 2175 ClG 16 20 30.70 +29 53 31.2           ~ 133 0
113 ACO 2183 ClG 16 21 42.50 +42 45 52.6           ~ 26 0
114 ACO 2196 ClG 16 27 11.07 +41 30 50.6           ~ 23 0
115 ACO 2197 ClG 16 27 48.01 +40 58 04.5           ~ 290 0
116 ACO 2199 ClG 16 28 34.5 +39 32 26           ~ 1206 1
117 ACO 2211 ClG 16 34 03.24 +40 55 56.4           ~ 18 0
118 ACO 2245 ClG 17 02 38.26 +33 30 10.0           ~ 66 0
119 ACO 2244 ClG 17 02 40.33 +34 02 58.7           ~ 301 0
120 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0

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