2007AJ....133..261B


Query : 2007AJ....133..261B

2007AJ....133..261B - Astron. J., 133, 261-269 (2007/January-0)

Interstellar medium disruption in the Centaurus A group.

BOUCHARD A., JERJEN H., DA COSTA G.S. and OTT J.

Abstract (from CDS):

We present the results of a 21 cm neutral hydrogen (H I) line detection experiment in the direction of 18 low-luminosity dwarf galaxies of the Centaurus A group, using the Australia Telescope National Facility 64 m Parkes Radio Telescope and the Australia Telescope Compact Array. Five dwarfs have H I masses between M_HI_=4x105 and 2.1x107 Mand 0.04 ML–1☉,B<M_HI/LB_<1.81 ML–1☉,B. The other 13 have upper limits between M_HI_=5x105 and 4x106 M (M_HI/LB_<0.24 ML–1☉,B). Two of the mixed-morphology dwarfs remain undetected in H I, a situation that is in contrast to that of similar Local Group and Sculptor group objects, which all contain significant amounts of neutral gas. There is a discontinuity in the H I properties of Centaurus A group low-luminosity dwarfs that is unobserved among Sculptor group dwarfs. All objects fainter than MB=-13 have either M_HI_>107 or M_HI_<106 M. This gap may be explained by the ram pressure stripping mechanism at work in this dense environment in which all galaxies with M_HI_<107 Mhave been stripped of their gas. The required intergalactic medium density to achieve this is ∼10–3/cm3.

Abstract Copyright:

Journal keyword(s): Galaxies: Dwarf - Galaxies: Evolution - Galaxies: Individual: Name: Centaurus A - Galaxies: ISM

Simbad objects: 34

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Number of rows : 34
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 185 Sy2 00 38 57.970 +48 20 14.56   9.10 9.2     ~ 745 1
2 M 110 GiG 00 40 22.0544552438 +41 41 07.496294862   8.92 8.07     ~ 1238 1
3 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11382 1
4 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 472 0
5 NAME Pisces I G 01 03 56.6 +21 53 41   16.18 14.3     ~ 368 0
6 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 482 2
7 NAME Antlia Dwarf Galaxy G 10 04 03.9 -27 20 01 16.73 15.69 15.17 15.00   ~ 200 1
8 ESO 219-10 G 12 56 09.6 -50 08 38   16.96   15.36   ~ 20 0
9 ESO 269-37 G 13 03 33.6 -46 35 05   16.29   14.95   ~ 40 1
10 LEDA 166152 G 13 05 02.5 -40 04 55   16.0   16.2 16.0 ~ 52 0
11 [JBF2000] Cen A-dE1 GiG 13 12 47.7 -41 50 03           ~ 3 0
12 ESO 269-66 GiC 13 13 09.2 -44 53 23   14.14       ~ 54 0
13 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 238 0
14 [JBF2000] Cen A-dE2 GiG 13 21 33.7 -31 52 43           ~ 4 0
15 LEDA 46680 G 13 22 02.1 -42 32 10   16.6       ~ 48 0
16 LEDA 166164 G 13 22 56.2 -33 34 22   17.6       ~ 24 0
17 LEDA 3097728 G 13 23 29.9 -23 23 35           ~ 10 0
18 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4111 3
19 ESO 324-24 LSB 13 27 38.8 -41 28 47   12.91   12.13 12.3 ~ 89 0
20 NAME Fourcade-Figueroa G 13 34 47.3 -45 32 51   11.69 11.40 10.03 11.2 ~ 69 0
21 ESO 444-78 GiC 13 36 30.8 -29 14 03   15.49   14.81 15.0 ~ 77 0
22 LEDA 166170 G 13 36 35.5 -29 34 17   14.3       ~ 44 0
23 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2310 2
24 NGC 5237 IG 13 37 39.056 -42 50 48.90   13.26 12.67 12.34   ~ 95 1
25 LEDA 48515 G 13 42 05.7 -45 12 20   17.6       ~ 44 1
26 [JBF2000] Cen A-dE3 GiG 13 46 00.8 -36 20 15           ~ 3 0
27 LEDA 166175 G 13 46 16.8 -45 41 05   19.2       ~ 33 1
28 LEDA 166176 GiG 13 46 40.4 -29 58 41   19       ~ 21 0
29 ESO 384-16 G 13 57 01.6 -35 19 58   14.80   14.10   ~ 48 0
30 LEDA 3097729 GiG 14 30 05.0 -33 28 45           ~ 7 0
31 ESO 272-25 G 14 43 25.5 -44 42 18   14.79   14.00 13.8 ~ 34 0
32 NAME Aquarius Dwarf G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 407 1
33 NAME Peg dSph GiG 23 51 46.4 +24 35 11   14.5 13.2     ~ 223 2
34 NAME Local Group GrG ~ ~           ~ 7322 0

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2021.08.06-05:39:37

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