1999AJ....117.1758Y

Query : 1999AJ....117.1758Y

1999AJ....117.1758Y - Astron. J., 117, 1758-1763 (1999/April-0)

Improved searches for H I in three dwarf spheroidal galaxies.

YOUNG L.M.

Abstract (from CDS):

Previous searches for H I in our Galaxy's dwarf spheroidal companions have not been complete enough to settle the question of whether or not these galaxies have H I, especially in their outer parts. We present VLA observations of three dwarf spheroidals: Fornax, Leo II, and Draco, all of which have known stellar velocities. The new data show no H I emission or absorption. Column density limits in emission are 4x1018 to 7x1018 cm–2 in the centers of the galaxies. The importance of the new observations is that they cover larger areas than previous searches and are less plagued by confusion with foreground (Galactic) H I. The apparent absence of neutral gas in the Fornax dwarf spheroidal is especially puzzling, because recent photometry shows evidence of stars only 108 years old. We discuss whether the VLA observations could have missed significant amounts of H I.

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Journal keyword(s): Galaxies: Evolution - Galaxies: Individual: Name: Draco - Galaxies: Individual: Name: Fornax - Galaxies: Individual: Name: Leo II - Galaxies: ISM - Galaxies: Local Group

Nomenclature: Table 2: [Y99] Draco N (Nos 1-5), [Y99] Leo II N (Nos 1-4), [Y99] Fornax N (Nos 1-2).

Simbad objects: 24

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Number of rows : 24
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 NAME Magellanic Stream HVC 00 32 -30.0           ~ 971 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11142 1
3 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1358 4
4 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 533 2
5 [Y99] Fornax 2 HI 02 39 03.4 -34 36 39           ~ 1 0
6 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1741 1
7 [Y99] Fornax 1 HI 02 40 08.2 -34 29 20           ~ 1 0
8 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1124 0
9 NAME M 81 Dwarf A G 08 23 55.1 +71 01 56   16.5       ~ 203 1
10 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1208 1
11 [Y99] Leo II 3 HI 11 12 07.1 +22 10 40           ~ 1 0
12 [Y99] Leo II 4 HI 11 12 15.9 +22 00 40           ~ 1 0
13 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 840 0
14 [Y99] Leo II 1 HI 11 13 59.4 +21 59 11           ~ 1 0
15 [Y99] Leo II 2 HI 11 14 12.3 +21 57 26           ~ 1 0
16 NAME UMi Galaxy G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1358 0
17 [Y99] Draco 5 HI 17 18 21.1 +58 10 05           ~ 1 0
18 [Y99] Draco 2 HI 17 19 04.3 +58 04 27           ~ 1 0
19 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1330 1
20 [Y99] Draco 4 HI 17 20 49.8 +57 35 38           ~ 1 0
21 [Y99] Draco 3 HI 17 20 51.3 +57 55 18           ~ 1 0
22 [Y99] Draco 1 HI 17 20 58.8 +57 49 08           ~ 1 0
23 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2186 2
24 NAME Local Group GrG ~ ~           ~ 8385 0

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