2007ApJ...671L..33M

Query : 2007ApJ...671L..33M

2007ApJ...671L..33M - Astrophys. J., 671, L33-L36 (2007/December-2)

Ram pressure stripping of an isolated Local Group dwarf galaxy: evidence for an intragroup medium.

McCONNACHIE A.W., VENN K.A., IRWIN M.J., YOUNG L.M. and GEEHAN J.J.

Abstract (from CDS):

We compare the stellar structure of the isolated, Local Group dwarf galaxy Pegasus (DDO 216) with low-resolution H I maps from L. M. Young et al. Our comparison reveals that Pegasus displays the characteristic morphology of ram pressure stripping; in particular, the H I has a ``cometary'' appearance that is not reflected in the regular, elliptical distribution of the stars. This is the first time this phenomenon has been observed in an isolated Local Group galaxy. The density of the medium required to ram pressure strip Pegasus is at least 10–5 to 10–6/cm3. We conclude that this is strong evidence for an intergalactic medium associated with the Local Group.

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Journal keyword(s): Galaxies: Dwarf - galaxies: individual (Pegasus) - Galaxies: Individual: Alphanumeric: DDO 216 - Galaxies: Interactions - Galaxies: Structure - Galaxies: Intergalactic Medium - Galaxies: Local Group

Simbad objects: 13

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Number of rows : 13
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 NAME Magellanic Stream HVC 00 32 -30.0           ~ 1079 1
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 NAME Andromeda XII G 00 47 27.0 +34 22 29     18.3     ~ 124 0
4 NAME Andromeda XIV G 00 51 35.0 +29 41 49     15.9     ~ 132 0
5 NAME Pisces I G 01 03 55.0 +21 53 06   16.18 14.3     ~ 404 0
6 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
7 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
8 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 812 2
9 NAME M 81-82 Group GrG 09 55 +69.1           ~ 758 0
10 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
11 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1
12 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
13 NAME Local Group GrG ~ ~           ~ 9325 0

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