1998A&A...336..411J


Query : 1998A&A...336..411J

1998A&A...336..411J - Astronomy and Astrophysics, volume 336, 411-424 (1998/8-2)

Gravitational microlensing by globular clusters.

JETZER P., STRAESSLE M. and WANDELER U.

Abstract (from CDS):

Stars in globular clusters can act either as sources for MACHOs (Massive Astrophysical Compact Halo Objects) located along the line of sight or as lenses for more distant background stars. Although the expected rate of microlensing events is small, such observations can lead to very useful results. In particular, one could get information on the shape of the galactic halo along different lines of sight, allowing to better constrain its total dark matter content. Moreover, on can also infer the total dark matter content of globular clusters, which is presently not well known. To this latter purpose, we analyse the microlensing events towards the galactic bulge, which lie close to the three globular clusters NGC 6522, NGC 6528 and NGC 6540. We find evidence that some microlensing events are indeed due to MACHOs located in the globular clusters, suggesting, therefore, that these clusters contain a significant amount of dark matter.

Abstract Copyright:

Journal keyword(s): dark matter - globular clusters: general - galaxies: halos - gravitational lensing

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3722 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10194 1
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15990 1
4 ESO 455-23 GlC 17 35 47.80 -30 28 11.0           ~ 222 0
5 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 760 1
6 ESO 455-49 GlC 17 50 46.40 -31 16 31.0           ~ 171 0
7 NAME UKS 1 GlC 17 54 27.20 -24 08 43.0           ~ 80 0
8 GCl 80.1 GlC 18 01 38.80 -26 50 23.0           ~ 106 0
9 ESO 521-16 GlC 18 02 57.40 -26 04 00.0           ~ 87 0
10 NGC 6522 GlC 18 03 34.08 -30 02 02.3   10.68 9.48     ~ 496 1
11 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 497 0
12 NGC 6540 GlC 18 06 08.60 -27 45 55.0           ~ 104 0
13 NGC 6544 GlC 18 07 20.58 -24 59 50.4   11.36 9.90     ~ 263 0
14 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 570 0
15 NGC 6558 GlC 18 10 18.38 -31 45 48.6   12.39 11.29     ~ 206 0
16 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1295 0

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2022.05.20-18:20:25

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