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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 421691.0, MPI für Astronomie / Publikationen_mpia
GRAVITY: getting to the event horizon of Sgr A*
Authors:Eisenhauer, F.; Perrin, G.; Brandner, W.; Straubmeier, C.; Richichi, A.; Gillessen, S.; Berger, J. P.; Hippler, S.; Eckart, A.; Schöller, M.; Rabien, S.; Cassaing, F.; Lenzen, R.; Thiel, M.; Clénet, Y.; Ramos, J. R.; Kellner, S.; Fédou, P.; Baumeister, H.; Hofmann, R.; Gendron, E.; Boehm, A.; Bartko, H.; Haubois, X.; Klein, R.; Dodds-Eden, K.; Houairi, K.; Hormuth, F.; Gräter, A.; Jocou, L.; Naranjo, V.; Genzel, R.; Kervella, P.; Henning, T.; Hamaus, N.; Lacour, S.; Neumann, U.; Haug, M.; Malbet, F.; Laun, W.; Kolmeder, J.; Paumard, T.; Rohloff, R. R.; Pfuhl, O.; Perraut, K.; Ziegleder, J.; Rouan, D.; Rousset, G.
Date of Publication (YYYY-MM-DD):2008
Title of Proceedings:Optical and Infrared Interferometry
Start Page:70132A-70132A
End Page:13
Title of Series:SPIE
Volume (in Series):7013
Name of Conference/Meeting:Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series
Review Status:not specified
Audience:Experts Only
Abstract / Description:We present the second-generation VLTI instrument GRAVITY, which currently is in the preliminary design phase. GRAVITY is specifically designed to observe highly relativistic motions of matter close to the event horizon of Sgr A*, the massive black hole at center of the Milky Way. We have identified the key design features needed to achieve this goal and present the resulting instrument concept. It includes an integrated optics, 4-telescope, dual feed beam combiner operated in a cryogenic vessel; near infrared wavefront sensing adaptive optics; fringe tracking on secondary sources within the field of view of the VLTI and a novel metrology concept. Simulations show that the planned design matches the scientific needs; in particular that 10µas astrometry is feasible for a source with a magnitude of K=15 like Sgr A*, given the availability of suitable phase reference sources.
Comment of the Author/Creator:Date: 2008, July 1, 2008
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL: [ID No:1]
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