Share Email Print
cover

Proceedings Paper

The GRAVITY spectrometers: optical design and principle of operation
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Operating on 6 interferometric baselines, i.e. using all 4 unit telescopes (UTs) of the Very Large Telescope Interferometer (VLTI) simultaneously, the 2nd generation VLTI instrument GRAVITY will deliver narrow-angle astrometry with 10μas accuracy at the infrared K-band. At this angular resolution, GRAVITY will be able to detect the positional shift of the photo-center of a flare at the Galactic Center within its orbital timescale of about 20 minutes, using the observed motion of the flares as dynamical probes of the gravitational field around the supermassive black hole Sgr A*. Within the international GRAVITY consortium, the 1. Physikalische Institut of the University of Cologne is responsible for the development and construction of the two spectrometers of the camera system: one for the science object, and one for the fringe tracking object. In this paper we present the phase-B optical design of the two spectrometers as it got derived from the scientific and technical requirements and as it passed the preliminary design review (PDR) at the European Southern Observatory (ESO) successfully in late 2009.

Paper Details

Date Published: 21 July 2010
PDF: 11 pages
Proc. SPIE 7734, Optical and Infrared Interferometry II, 773432 (21 July 2010); doi: 10.1117/12.855983
Show Author Affiliations
Christian Straubmeier, Univ. zu Köln (Germany)
Sebastian Fischer, Univ. zu Köln (Germany)
Constanza Araujo-Hauck, Univ. zu Köln (Germany)
Michael Wiest, Univ. zu Köln (Germany)
Senol Yazici, Univ. zu Köln (Germany)
Frank Eisenhauer, Max-Planck-Institut für extraterrestrische Physik (Germany)
Guy Perrin, LESIA, Observatoire de Paris, CNRS, UPMC (France)
Institut National des Sciences de l'Univers (France)
Groupement d'Interet Scientifique PHASE (France)
Wolfgang Brandner, Max-Planck-Institut für Astronomie (Germany)
Karine Perraut, Lab. d'Astrophysique Observatoire Grenoble (France)
Antonio Amorim, Faculdade de Ciencias da Univ. de Lisboa (Portugal)
Markus Schöller, European Southern Observatory (Germany)
Andreas Eckart, Univ. zu Köln (Germany)
Max-Planck-Institut fur Radioastronomie (Germany)


Published in SPIE Proceedings Vol. 7734:
Optical and Infrared Interferometry II
William C. Danchi; Françoise Delplancke; Jayadev K. Rajagopal, Editor(s)

© SPIE. Terms of Use
Back to Top