2007A&A...471..805K

Query : 2007A&A...471..805K

2007A&A...471..805K - Astronomy and Astrophysics, volume 471805-806 (2007/9-1)

Comments on a faint old stellar system at 150 kpc.

KAMAYA H.

Abstract (from CDS):

Recent study of SDSS J1257+3419 has revealed that this stellar system is either a faint and small dwarf galaxy or a faint and widely extended globular cluster. In this short note, the author suggests that this system is one of the smallest dwarf spheroidals (dSphs) in the Milky Way. We re-examine some observational quantities of this object and check whether it can be bound system. As a result, we find the mass of SDSS J1257+3419 is the lowest of dSphs in the Milky Way, and its mass density is typical of dSphs. Important is that the tidal radius of SDSS J1257+3419 is much larger than its half-light radius. That is, this very small dSph can be bound by its own gravity.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: halo - galaxies: dwarf

CDS comments: Table 1 46 Tuc is a probable misprint for 47 Tuc.

Simbad objects: 14

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Number of rows : 14
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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
3 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
4 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
5 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
6 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
7 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
8 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
9 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
10 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
11 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
12 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
13 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
14 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2

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