2007ApJ...666..231B

Query : 2007ApJ...666..231B

2007ApJ...666..231B - Astrophys. J., 666, 231-235 (2007/September-1)

Stellar velocity dispersion of the Leo A dwarf galaxy.

BROWN W.R., GELLER M.J., KENYON S.J. and KURTZ M.J.

Abstract (from CDS):

We measure the first stellar velocity dispersion of the Leo A dwarf galaxy, σ=9.3±1.3 km/s. We derive the velocity dispersion from the radial velocities of 10 young B supergiants and two H II regions in the central region of Leo A. We estimate a projected mass of (8±2.7)x107 M☉ within a radius of 2' and a mass-to-light ratio of at least 20±6 M☉/L☉. These results imply Leo A is at least ∼80% dark matter by mass.

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Journal keyword(s): Galaxies: Individual: Name: Leo A

Simbad objects: 29

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Number of rows : 29
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 Andromeda IX G 00 52 53.0 +43 11 45     16.3     ~ 176 1
2 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
3 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
4 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
5 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
6 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
7 SDSS J095915.12+304410.4 * 09 59 15.1177103352 +30 44 10.371817536           B:I/II 4 1
8 SDSS J095916.94+304348.2 s*b 09 59 16.9380712536 +30 43 48.192884868   19.159 19.274   19.278 B2Iab 3 1
9 SDSS J095920.22+304352.7 s*b 09 59 20.2165888464 +30 43 52.669749252   19.578 19.651   19.663 B8Ib 6 1
10 SDSS J095923.22+304506.2 s*b 09 59 23.2138070592 +30 45 06.173006004   20.203 20.27   20.27 B8Ib 3 1
11 SDSS J095924.90+304436.6 * 09 59 24.9041440392 +30 44 36.656870136           B:I/II 2 1
12 SDSS J095925.98+304610.4 * 09 59 25.980 +30 46 10.44           B:I/II 2 1
13 SDSS J095926.35+304526.0 s*b 09 59 26.3446883208 +30 45 26.068628628   19.271 19.329   19.35 B8Ib 3 1
14 Z 153-10 G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 652 0
15 SDSS J095927.05+304538.7 * 09 59 27.0544112448 +30 45 38.663526312           B:I/II 2 1
16 SDSS J095927.32+304544.6 * 09 59 27.3165484080 +30 45 44.680511340           B:I/II 2 1
17 SDSS J095927.53+304457.7 HII 09 59 27.53 +30 44 57.7           ~ 1 1
18 SDSS J095932.12+304348.5 * 09 59 32.1292243440 +30 43 48.447668352           B:I/II 2 1
19 SDSS J095933.32+304439.2 HII 09 59 33.3133191000 +30 44 39.180943392   19.665 19.798   19.764 O7/O8V 2 1
20 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
21 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
22 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
23 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
24 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
25 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
26 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
27 * gam Lyr * 18 58 56.6225626515 +32 41 22.400666366 3.140 3.200 3.250 3.27 3.28 B9.5II-III 296 0
28 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
29 NAME Local Group GrG ~ ~           ~ 9325 0

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