1998ApJ...506L.101V

Query : 1998ApJ...506L.101V

1998ApJ...506L.101V - Astrophys. J., 506, L101-L104 (1998/October-3)

Enhanced Hα emission in early-type galaxies belonging to compact groups.

VILCHEZ J.M. and IGLESIAS-PARAMO J.

Abstract (from CDS):

The results of Hα photometry of a sample of early-type galaxies belonging to nearby compact groups are presented. Over 75% of the galaxies in the sample were detected in Hα, a result that we have interpreted as proof of the presence of a warm interstellar medium within them. Comparing the Hα luminosities of the galaxies in our sample with those of a sample of early-type galaxies from the field, we have found that field early-type galaxies are systematically fainter in Hα than the compact group ones for a given B absolute magnitude by ΔlogLHαMLB~0.5. We suggest that the excess in the Hα emission within the groups is due to photoionization of gas by Lyman continuum photons emitted by massive stars. Recent massive star formation would be a consequence of the accretion by early-type galaxies of gas from the outer envelopes of gas-rich galaxies experiencing close passages across the group.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Elliptical and Lenticular, cD - Galaxies: Evolution - Galaxies: Interactions - Galaxies: ISM

Simbad objects: 20

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Number of rows : 20
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 NGC 196 GiG 00 39 17.8424526792 +00 54 45.971984899   14.2   12.40   ~ 85 0
2 NGC 1216 GiG 03 07 18.3927342768 -09 36 45.561419820   16.00   13.67   ~ 52 0
3 LEDA 15636 AG? 04 36 36.6000944952 -02 50 35.437200000   16.76   15.05   ~ 23 0
4 NGC 2783B GiG 09 13 32.834 +30 00 00.31   15.2   13.33   ~ 84 0
5 MCG+05-22-018 AGN 09 13 34.0222370040 +30 02 23.333922168   17.01   15.97   ~ 49 0
6 MCG+05-22-020 GiG 09 13 37.3548457080 +29 59 58.392000564   16.51   14.44   ~ 44 0
7 NGC 3193 GiP 10 18 24.884 +21 53 38.32 12.29 11.83 10.88 12.19   ~ 301 1
8 NGC 4169 Sy2 12 12 18.7701840312 +29 10 45.851425968   12.9 12.34 11.67   ~ 148 1
9 NGC 4174 Sy2 12 12 26.8876661016 +29 08 57.158312172   14.3 13.64 13.05   ~ 114 2
10 NGC 5353 rG 13 53 26.7104646981 +40 16 59.200050598   11.8   10.57   ~ 309 1
11 NGC 5354 LIN 13 53 26.7262413240 +40 18 09.928163700   12.3   10.64   ~ 169 0
12 NGC 5355 GiP 13 53 45.5694778488 +40 20 19.254210180   14.0   13.08   ~ 126 0
13 NGC 5358 GiP 13 54 00.4229168952 +40 16 38.364580668   14.6   13.35   ~ 102 0
14 NGC 6027A GiG 15 59 10.8358913184 +20 45 43.819011072   13.4   14.21   ~ 70 0
15 NGC 6027B GiG 15 59 11.156 +20 45 17.02   13.4   13.46   ~ 78 0
16 NGC 6027 GiG 15 59 12.542 +20 45 48.07   13.4   13.07   ~ 117 2
17 NGC 7317 Sy2 22 35 51.8681746944 +33 56 41.758033380 15.10 14.57 13.60 12.72   ~ 182 1
18 NGC 7550 LIN 23 15 16.0635618785 +18 57 41.255155052   13.9   11.85   ~ 133 1
19 NGC 7553 GiG 23 15 33.0984377976 +19 02 53.479431456   15.85   13.90   ~ 33 0
20 NGC 7609 IG 23 19 30.0445916616 +09 30 29.844638928   15.23 14.29 13.43   ~ 69 0

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