[SEMINARI] Stellar density and kinematics in the central parsec of the Galaxy, Rainer Sch=?US-ASCII?Q?=F6?=del

[Enric Marco]

Stellar density and kinematics in the central parsec of the Galaxy

Dr. Rainer Schödel

Instituto de Astrofísica de Andalucía

Lloc: Seminari del departament d'Astronomia i Astrofísica

Dia: Divendres 27 novembre 2009

Hora: 12:00

Resum

The center of the Milky Way is a unique laboratory to study the
structure and dynamics of a dense stellar cluster surrounding a
massive black hole. At the Galactic center, we find the combination of
nuclear cluster plus central black hole that is typical for spiral
galaxies. While we can only study the integrated light in the case of
the barely resolved  extragalactic nuclear star clusters, the Milky
Way is currently the only case, in which the structure of the cluster
can be analyzed in detail, i.e. both stellar densities and dynamics
can be probed directly, via measurements on individual stars. In this
talk we will focus on recent research on the Milky Way nuclear star
cluster.  Recent measurement of stellar dynamics out to a projected
distance of 1 pc from the black hole have lead to the first direct
measurement of the enclosed extended, i.e. non-black hole, mass in the
central parsec. We have also identified the reason why the black hole
mass was underestimated by a factor of ~2 before orbital measurements
became available. Perhaps one of the greatest current enigmas is the
absence of a stellar cusp around the black hole. While a cusp is a
solid prediction from theory, recent observations confirm that it is
absent, at least in the stellar population that can be analyzed with
current instrumentation. We will discuss the currently suggested
explanations for this finding.
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/------------------------------------\
Dr. Enric Marco
Departament d'Astronomia i Astrofísica
Facultat de Física
Universitat de València
C/  Dr. Moliner, 50
46100 Burjassot, Spain
Phone: (34)-96-354-3069
Fax:(34)-96-354-3084
enric.marco en uv.es
www.uv.es/marco
www.uv.es/aia2009
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