1998A&A...333..117B


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.21CEST08:32:49

1998A&A...333..117B - Astronomy and Astrophysics, volume 333, 117-124 (1998/5-1)

Globular clusters within 5° of the Galactic center.

BARBUY B., BICA E. and ORTOLANI S.

Abstract (from CDS):

In the recent years we have concentrated efforts to collect Colour-Magnitude Diagrams of the globular clusters projected in the central parts of the Galaxy. So far we were able to gather photometric data in the V, I and Gunn z bandpasses, for 16 out of the 17 known clusters in the central 5° radius, most of them severely reddened. Reddening, distance and metallicity are estimated from the horizontal and red giant branches. We study the resulting cluster spatial distribution and conclude that essentially no cluster is detected beyond the Galactic Center distance. The results favour a flattened bulge extending from the Galactic Center to 4.5kpc from the Sun. The density distribution of the clusters follows the current models for bulge field stars. We estimate that missing clusters on the opposite side of the Galaxy bulge may amount ∼15 clusters similar to those detected on our side. The projected distribution of clusters is asymmetrical, with higher absorption in the southern Galactic hemisphere. The metallicity distribution of our sample clusters results similar to that of bulge field stars. The present ground-based results coupled to main sequence data of two genuine bulge clusters using the Hubble Space Telescope, point to a scenario of an old flat bulge with common origin for the stellar populations in both globular clusters and field.

Abstract Copyright:

Journal keyword(s): globular clusters: general - Galaxy: center - Galaxy: formation - Hertzsprung-Russel (HR) and C-M diagrams

Simbad objects: 22

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Number of rows : 22

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 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3567 0
2 NGC 6356 GlC 17 23 34.99 -17 48 46.9   10.01 7.42     ~ 321 1
3 ESO 454-29 GlC 17 27 33.24 -30 48 07.8           ~ 211 0
4 GCl 66.1 GlC 17 30 38.90 -31 35 44.0           ~ 97 0
5 ESO 455-11 GlC 17 31 05.20 -29 58 54.0           ~ 131 0
6 C 1730-333 GlC 17 33 24.50 -33 23 20.0           ~ 208 2
7 ESO 455-23 GlC 17 35 47.80 -30 28 11.0           ~ 200 0
8 ESO 520-21 GlC 17 43 42.20 -26 13 21.0           ~ 144 0
9 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11660 0
10 NAME cl Djorgovski 1 GlC 17 47 28.30 -33 03 56.0           ~ 57 0
11 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 698 1
12 ESO 455-49 GlC 17 50 46.40 -31 16 31.0           ~ 153 0
13 NAME UKS 1 GlC 17 54 27.20 -24 08 43.0           ~ 66 0
14 GCl 80.1 GlC 18 01 38.80 -26 50 23.0           ~ 86 0
15 ESO 456-38 GlC 18 01 49.10 -27 49 33.0           ~ 57 0
16 ESO 521-16 GlC 18 02 57.40 -26 04 00.0           ~ 73 0
17 NGC 6522 GlC 18 03 34.08 -30 02 02.3   10.68 9.48     ~ 455 1
18 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 466 0
19 NGC 6540 GlC 18 06 08.60 -27 45 55.0           ~ 90 0
20 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 536 0
21 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1815 0
22 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 922 0

    Equat.    Gal    SGal    Ecl

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2020.09.21-08:32:49

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