2005A&A...444..133T

Query : 2005A&A...444..133T

2005A&A...444..133T - Astronomy and Astrophysics, volume 444, 133-136 (2005/12-2)

The HI content of the recently discovered field dwarf galaxy NAME APPLES 1.

TARCHI A., OTT J., PASQUALI A., FERRERAS I., CASTANGIA P. and LARSEN S.S.

Abstract (from CDS):

We present observations in a search for neutral hydrogen associated with the recently detected field dwarf galaxy APPLES 1, performed with the Parkes radiotelescope. The observed radio spectrum shows no evident (>3σ rms) line emission indicating an upper limit for the HI content of the galaxy of ∼106M☉ and providing an upper value for the MHI/LB ratio equal to 2.4M☉/L☉. The low value of the HI content suggested by the observations, together with the galaxy optical morphology, might indicate that APPLES 1 is a dwarf spheroidal. This indication is in contrast with the evidence of recent star formation, which is typical for dwarf irregular galaxies. This may suggest that APPLES 1 belongs to the class of mixed dwarf irregular/spheroidal transition-type galaxies. We also conclude that the relatively low neutral gas mass in APPLES 1 can be explained by an extended and inefficient star formation process, without the need for a dramatic event such as enhanced star formation or a past encounter with a massive galaxy or galaxy group.

Abstract Copyright: ∼

Journal keyword(s): galaxies: individual: APPLES 1 - galaxies: dwarf - radio lines: ISM - radio lines: galaxies

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 59 EmG 00 15 25.126 -21 26 39.68 14.01 13.21 12.59 12.31   ~ 100 0
2 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 234 0
3 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 800 1
4 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1309 1
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11152 1
6 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 509 0
7 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1360 4
8 NAME Pisces I G 01 03 56.6 +21 53 41   16.18 14.3     ~ 387 0
9 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 533 2
10 NAME IC 342 Group GrG 03 48 42 +68 00.8           ~ 100 1
11 NAME Maffei Group GrG 03 49 +68.0           ~ 49 0
12 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17438 0
13 NAME M 81-82 Group GrG 09 55 +69.1           ~ 717 0
14 2dFGRS TGN368Z258 LSB 11 04 40.082 +00 03 29.62   16.9       ~ 23 0
15 NAME CVn I Group GrG 12 32 48.3 +33 57 07           ~ 142 0
16 LEDA 135809 LSB 12 50 04.754 -00 13 57.65   17.6     15.5 ~ 14 0
17 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 263 0
18 NAME NGC 5236 Group GrG 13 37 06 -29 51.9           ~ 64 0
19 MGC 60227 G 14 20 33.38 -00 09 29.2   19.74       ~ 2 0
20 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 300 0
21 NAME APPLES 1 G 23 15 03.3 -42 32 22           ~ 17 0
22 NAME Local Group GrG ~ ~           ~ 8393 0

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