2001AJ....121..793R

Query : 2001AJ....121..793R

2001AJ....121..793R - Astron. J., 121, 793-807 (2001/February-0)

Starbursts versus truncated star formation in nearby clusters of galaxies.

ROSE J.A., GABA A.E., CALDWELL N. and CHABOYER B.

Abstract (from CDS):

We present long-slit spectroscopy, B- and R-bandpass imaging, and 21 cm observations of a sample of early-type galaxies in nearby clusters, which are known to be either in a star-forming phase or to have had star formation that recently terminated. From the long-slit spectra, obtained with the Blanco 4 m telescope, we find that emission lines in the star-forming cluster galaxies are significantly more centrally concentrated than in a sample of field galaxies. The broadband imaging reveals that two currently star-forming early-type galaxies in the Pegasus I cluster have blue nuclei, again indicating that recent star formation has been concentrated. In contrast, the two galaxies for which star formation has already ended show no central color gradient. The Pegasus I galaxy with the most evident signs of ongoing star formation (NGC 7648), exhibits signatures of a tidal encounter. Neutral hydrogen observations of that galaxy with the Arecibo radio telescope reveal the presence of ∼4x108 M☉ of H I. Arecibo observations of other current or recent star-forming early-type galaxies in Pegasus I indicate smaller amounts of gas in one of them, and only upper limits in others. These observations indicate that NGC 7648 in the Pegasus I cluster owes its present star formation episode to some form of tidal interaction. The same may be true for the other galaxies with centralized star formation, but we cannot rule out the possibility that their outer disks have been removed via ram pressure stripping, followed by rapid quenching of star formation in the central region.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Clusters: General - Galaxies: Elliptical and Lenticular, cD - Galaxies: Evolution - Galaxies: Interactions - Galaxies: Starburst - Galaxies: Intergalactic Medium

CDS comments: T.1 Galaxies A are Z. T.2 DC 2048 No NNN are [D80] DRCG 2048-52 NNN, Coma-D 15 and 45 are [D80] ACO 165 6 15 and 45. In text par. 3, A 11352+3536 misprint for 11332 (Z 1133.2+3536).

Simbad objects: 96

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Number of rows : 96
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 Z 409-29 AG? 00 31 26.0536529448 +06 12 24.245502732   14.3       ~ 66 0
2 Z 383-69 EmG 00 41 21.5333391336 -01 42 57.091024512   14.3   13.9 13.6 ~ 67 0
3 Z 500-91 GiP 00 46 56.0222630808 +32 40 31.127024964   13.86       ~ 70 1
4 Z 412-7 GiC 01 37 07.2924214752 +04 53 07.203735960   14.5       ~ 39 0
5 Z 502-120 G 01 37 16.9022587008 +28 53 25.781796924   14.4       ~ 40 0
6 NGC 695 AGN 01 51 14.3479513536 +22 34 55.956444960   13.7       ~ 201 1
7 IC 197 AG? 02 04 04.9377499704 +02 47 12.404807592   14.3       ~ 43 0
8 IC 1776 AG? 02 05 15.242 +06 06 24.92   14.4       ~ 47 0
9 Z 438-32 AG? 02 08 24.655 +14 58 18.99   14.3       ~ 43 0
10 Z 388-21 LSB 02 28 12.376 -01 20 56.33   13.7   13.7 13.6 ~ 59 0
11 2MASX J03250297-5314380 GiC 03 25 02.9541075600 -53 14 37.937341788   16       ~ 5 0
12 2MASX J03264272-5306404 GiC 03 26 42.7404899160 -53 06 40.085690976   15   15.67   ~ 7 0
13 LEDA 74446 GiC 03 26 58.5 -53 17 22   16       ~ 4 0
14 ACO 3125 ClG 03 27 22 -53 30.6           ~ 57 2
15 ACO 3128 ClG 03 29 50.6 -52 34 48           ~ 183 3
16 Z 264-47 LIN 09 00 20.2564349568 +52 29 39.268714632   13.7       ~ 56 0
17 NGC 2780 GiP 09 12 44.3905229280 +34 55 31.725869052   14.2       ~ 94 0
18 NGC 2782 Sy2 09 14 05.11967 +40 06 49.6800 12.29 12.30 11.63     ~ 494 3
19 NGC 3009 GiG 09 50 11.1247559952 +44 17 42.129497076   14.5       ~ 42 0
20 Z 36-16 AG? 10 00 31.9920033168 +04 24 25.671558420   14.2       ~ 74 0
21 Z 211-42 LSB 10 20 03.6392021400 +38 36 55.942637184   14.3       ~ 40 0
22 Z 240-60 H2G 10 35 04.867 +46 33 41.22   14.1       ~ 56 0
23 Z 65-63 GiG 10 36 21.321 +13 42 41.00   14.2       ~ 61 0
24 IC 2591 G 10 36 38.6679587376 +35 03 10.509559380   14.5       ~ 42 0
25 NGC 3326 H2G 10 39 31.8598757040 +05 06 27.327802320   14.2       ~ 57 0
26 Z 38-42 bCG 10 53 03.845 +04 37 54.24   14.1       ~ 83 0
27 Z 95-93 LSB 11 01 50.955 +16 36 25.11   14.4       ~ 54 0
28 Z 267-41 AG? 11 06 54.697 +51 12 12.16   14.20       ~ 81 0
29 Z 67-17 GiG 11 09 49.2922561920 +12 46 17.534906004   14.2       ~ 46 1
30 NGC 3633 AG? 11 20 26.2369091784 +03 35 07.894295520   14.45       ~ 85 2
31 Z 185-88 GiG 11 33 43.425 +32 38 09.95   14.5       ~ 59 0
32 Z 186-11 H2G 11 35 49.9796445840 +35 20 06.829450944   14.5       ~ 79 0
33 Z 97-44 AGN 11 39 47.5399702776 +19 56 00.304679652   14.2       ~ 51 0
34 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1127 1
35 NGC 3921 LIN 11 51 06.8803989360 +55 04 43.414457484   13.4 12.64     ~ 260 1
36 IC 746 EmG 11 55 35.1139294128 +25 53 22.062228936   14.5       ~ 50 0
37 Z 13-4 EmG 11 55 36.866 +01 14 14.43   13.623 13.011 12.508 11.890 ~ 123 0
38 NGC 4034 AG? 12 01 29.6712136272 +69 19 26.396784552   14.5       ~ 57 0
39 Z 315-8 H2G 12 02 37.0627088832 +64 22 35.064264864   14.3       ~ 68 1
40 NGC 4120 AG? 12 08 31.003 +69 32 41.47   14.1       ~ 59 0
41 NGC 4141 AG? 12 09 47.3108897640 +58 50 57.253147188   14.5       ~ 86 0
42 NGC 4159 AG? 12 10 53.635 +76 07 32.99   14.3       ~ 57 0
43 NGC 4238 AG? 12 16 55.8123033360 +63 24 35.571632004   14.2       ~ 64 0
44 Z 243-68 AG? 12 19 12.2467997544 +49 21 17.286997140   14.3       ~ 56 0
45 NGC 4424 H2G 12 27 11.5741235616 +09 25 14.330453700   13.1       ~ 407 0
46 Z 335-15 G 12 35 08.73767 +72 13 52.1870   14.30       ~ 35 0
47 Mrk 55 LIN 12 57 25.2481557048 +27 24 16.550025768   16.0       ~ 78 0
48 A2 236 GiC 12 57 56.22936 +27 34 52.8320   16.90 15.81 15.69   ~ 38 0
49 NGC 4858 EmG 12 59 02.0718950520 +28 06 56.228264028 15.33 15.5 15.08 15.16   ~ 126 0
50 Z 160-73 EmG 12 59 05.2918849008 +27 38 40.186270032 14.90 15.1 14.54     ~ 129 0
51 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
52 NGC 4961 EmG 13 05 47.5766802528 +27 44 03.247625004   13.5       ~ 196 0
53 Z 271-19 LSB 13 08 37.262 +54 04 28.02   14.2       ~ 64 0
54 Z 217-34 AG? 13 21 36.0083858712 +42 16 57.848962800   14.5       ~ 40 0
55 NGC 5117 GiC 13 22 56.462 +28 18 59.51   14.597       ~ 86 0
56 NGC 5230 GiG 13 35 31.8688678992 +13 40 34.240271556   13.4       ~ 86 0
57 Z 190-39 GiC 13 38 24.871 +33 07 03.75   14.389       ~ 68 0
58 NGC 5267 LIN 13 40 39.9765450720 +38 47 38.639158116   14.3       ~ 59 0
59 Z 190-45 AG? 13 44 28.414 +35 11 32.28   14.5       ~ 63 0
60 NGC 5425 GiG 14 00 47.673 +48 26 37.82   14.3       ~ 88 0
61 NGC 5491 AG? 14 10 57.3535357272 +06 21 53.492958720   13.9       ~ 61 0
62 NGC 5541 G 14 16 31.8001190520 +39 35 20.611389876   13.4       ~ 68 0
63 Z 75-65 AG? 14 32 53.525 +11 35 41.47   14.3       ~ 80 0
64 NGC 5762 Sy2 14 48 42.5685455352 +12 27 25.966186524   14.3       ~ 84 0
65 NGC 5881 AG? 15 06 20.8187456280 +62 58 51.508098984   14.1       ~ 27 0
66 NGC 5874 GiG 15 07 51.820 +54 45 10.08   14.1       ~ 98 0
67 NGC 5875A AG? 15 08 33.4989384408 +52 17 46.226634684   14.1       ~ 54 0
68 IC 1124 GiG 15 30 00.604 +23 38 17.52   14.5       ~ 45 0
69 Z 319-18 GiG 15 31 45.2165326056 +67 33 22.698079164   14.4       ~ 44 0
70 NGC 5993 Q? 15 44 27.4032686664 +41 07 18.525673092   13.9       ~ 52 0
71 NGC 6007 LIN 15 53 23.1695197512 +11 57 33.057856476   14.1       ~ 64 0
72 Z 107-58 AG? 15 54 41.2346829528 +16 37 02.322772572   14.5       ~ 49 0
73 NGC 6131 GiC 16 21 52.2358366224 +38 55 56.861315832   14.2       ~ 48 0
74 ACO S 906 ClG 20 42.3 -51 57           ~ 28 1
75 LEDA 84941 GiC 20 49 13.5 -52 33 48   16       ~ 8 0
76 2MASX J20510730-5243351 GiC 20 51 07.2617431584 -52 43 34.851543780   16       ~ 8 0
77 6dFGS gJ205156.5-520346 GiC 20 51 56.5063576152 -52 03 45.696563316   15   15.69   ~ 10 0
78 LEDA 85009 GiC 20 52 41.215 -52 07 18.90   16       ~ 7 0
79 LEDA 85014 GiC 20 52 51.2 -52 14 23   16       ~ 6 0
80 NGC 7252 AGN 22 20 44.7748209648 -24 40 41.909518200 12.26 12.46 12.06 11.57   ~ 720 1
81 Z 404-21 AG? 22 33 06.3163029744 +08 05 50.951821380   14.2       ~ 50 0
82 NGC 7328 AG? 22 37 29.2909038096 +10 31 53.624742996   13.99 13.10 12.55 11.46 ~ 95 0
83 UGC 12265 PaG 22 57 35.6 +19 47 12           ~ 32 0
84 UGC 12265 N GiP 22 57 35.976 +19 47 25.66   14.5       ~ 44 0
85 NGC 7557 GiP 23 15 39.7623297912 +06 42 29.924345880   15.0       ~ 43 0
86 NGC 7604 AG? 23 17 51.90 +07 25 47.6   15.2       ~ 28 1
87 NGC 7583 G 23 17 52.7593718736 +07 22 46.248037212   14.8       ~ 22 1
88 NGC 7611 GiG 23 19 36.5915702280 +08 03 48.102500664   14.0       ~ 77 0
89 Z 454-40 GiG 23 20 02.7842827632 +15 57 10.025218404   14.3       ~ 84 0
90 NGC 7620 AGN 23 20 05.6852313504 +24 13 16.129502148   13.5       ~ 90 0
91 NGC 7617 GiG 23 20 08.9642089560 +08 09 56.684464488   15.1       ~ 71 0
92 NAME Peg I ClG 23 21 +08.3           ~ 71 0
93 NGC 7648 GiG 23 23 54.031 +09 40 02.85   13.5       ~ 87 1
94 UGC 12856 IG 23 56 44.64 +16 48 30.9           ~ 54 0
95 MCG+03-01-004 AG? 23 56 45.25 +16 48 50.2           ~ 41 0
96 NAME Local Group GrG ~ ~           ~ 9325 0

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