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


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

2007A&A...471..805K - Astronomy and Astrophysics, volume 471, 805-806 (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 - 2021
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3652 0
2 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1185 4
3 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1552 1
4 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1033 0
5 NAME Leo I dSph G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1096 1
6 NAME Dwarf Elliptical Galaxy in Sex G 10 13 02.9 -01 36 53   12 10.4     ~ 749 0
7 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 283 1
8 NAME Leo B G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 767 0
9 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 225 2
10 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 278 1
11 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 364 0
12 NAME UMi Galaxy G 15 09 11.34 +67 12 51.7   13.60 10.6     ~ 1225 0
13 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1212 1
14 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1860 2

    Equat.    Gal    SGal    Ecl

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2021.07.24-03:24:11

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