2009AJ....137.3809C


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET21:10:33

2009AJ....137.3809C - Astron. J., 137, 3809-3814 (2009/April-0)

The globular cluster AM 4: yet another young globular associated with the Sgr dwarf spheroidal galaxy?

CARRARO G.

Abstract (from CDS):

The complete census of globular clusters formerly belonging to the Sagittarius Dwarf Spheroidal (Sgr dSph) galaxy and now deposited into the Galactic halo is an important contribution to our comprehension of the evolution and disruption of this dwarf galaxy. We investigate in this study the possibility that the poorly known "old" globular AM 4 might be associated with the Sgr dSph galaxy, and at the same time provides more solid estimate of its basic parameters. New high-quality BVI photometry is presented, from which an improved color-magnitude diagram is constructed, and estimates of age and distance are then derived. The distance and Galactic position are finally investigated in detail. AM 4 is found to be a low-luminosity (MV= -1.82) cluster undergoing strong tidal stress by the Milky Way and on the verge to be dissolved. Besides, and at odds with previous suggestions, we provide evidences that AM 4 is indeed young, with an age around 9 Gyr (as Terzan 7), but somewhat more metal poor ([Fe/H=-0.97]). AM 4 is located at 33+3–4 kpc from the Sun, in a direction and at distance not totally incompatible with the Sgr dSph stream. Although we significantly improved our knowledge of AM 4, further studies are encouraged to obtain radial velocity and metallicity to demonstrate more firmly (or deny) the association to Sgr.

Abstract Copyright:

Journal keyword(s): globular clusters: general - globular clusters: individual: AM 4

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Whiting 1 GlC 02 02 56.8 -03 15 10           ~ 92 0
2 NAME Sgr Stream St* 02 22 +00.0           ~ 630 0
3 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 340 1
4 C 1353-269 GlC 13 56 21.1 -27 10 03           ~ 101 0
5 NAME Serpens Dwarf GlC 15 16 05.30 -00 06 41.0   15.1       ~ 609 1
6 PG 1657+078 HS* 16 59 32.2152633688 +07 43 31.413989790 13.919 14.877 15.019 15.098 15.115 sdB 49 0
7 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11246 0
8 SA 110- reg 18 45 +00.6           ~ 95 0
9 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1682 2
10 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 347 0
11 [L92b] Mark A HS* 20 43 59.2255386146 -10 47 41.693629843 11.854 13.010 13.256 13.370 13.494 sdO 66 1
12 PG 2213-006 HS* 22 16 28.3762668612 -00 21 13.502700359 12.747 13.93 14.14 14.54 14.348 sdOB 72 0
13 GCl 124 GlC 23 06 44.48 +12 46 19.2   15.6       ~ 227 1

    Equat.    Gal    SGal    Ecl

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2020.02.17-21:10:33

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