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Proceedings Paper

X-shooter: UV-to-IR intermediate-resolution high-efficiency spectrograph for the ESO VLT
Author(s): Sandro D'Odorico; Michael I. Andersen; Paolo Conconi; Vincenzo De Caprio; Bernard Delabre; Paolo Di Marcantonio; Hans Dekker; Mark D. Downing; Gert Finger; Paul Groot; Hiddo H. Hanenburg; Francois Hammer; David Horville; Jens Hjorth; Lex Kaper; Jens Klougart; Per Kjaergaard-Rasmussen; Jean-Louis Lizon; Michel Marteaud; Ruben Mazzoleni; Niels Michaelsen; Roberto Pallavicini; Florence Rigal; Paolo Santin; Anton Norup Soerensen; Paolo Spano; Lars Venema; Pascal Vola; Filippo Maria Zerbi
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Paper Abstract

X-shooter is a single target spectrograph for the Cassegrain focus of one of the VLT UTs. It covers in a single exposure the spectral range from the UV to the H band with a possible extension into part of the K band. It is designed to maximize the sensitivity in this spectral range through the splitting in three arms with optimized optics, coatings, dispersive elements and detectors. It operates at intermediate resolutions (R=4000-14000, depending on wavelength and slit width) sufficient to address quantitatively a vast number of astrophysical applications while working in a background-limited S/N regime in the regions of the spectrum free from strong atmospheric emission and absorption lines. The small number of moving functions (and therefore instrument modes) and fixed spectral format make it easy to operate and permit a fast response. A mini-IFU unit (1.8" x 4") can be inserted in the telescope focal plane and is reformatted in a slit of 0.6"x 12" .The instrument includes atmospheric dispersion correctors in the UV and visual arms. The project foresees the development of a fully automatic data reduction package. The name of the instrument has been inspired by its capability to observe in a single shot a source of unknown flux distribution and redshift. The instrument is being built by a Consortium of Institutes from Denmark, France, Italy and the Netherlands in collaboration with ESO. When it operation, its observing capability will be unique at very large telescopes.

Paper Details

Date Published: 30 September 2004
PDF: 10 pages
Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004); doi: 10.1117/12.550005
Show Author Affiliations
Sandro D'Odorico, European Southern Observatory (Germany)
Michael I. Andersen, Astrophysikalisches Institut Potsdam (Germany)
Paolo Conconi, INAF, Osservatorio Astronomico di Merate (Italy)
Vincenzo De Caprio, INAF, Osservatorio Astronomico di Merate (Italy)
Bernard Delabre, European Southern Observatory (Germany)
Paolo Di Marcantonio, INAF, Osservatorio Astronomico di Trieste (Italy)
Hans Dekker, European Southern Observatory (Germany)
Mark D. Downing, Europena Southern Observatory (Germany)
Gert Finger, European Southern Observatory (Germany)
Paul Groot, Univ. Nijmegen (Netherlands)
Hiddo H. Hanenburg, ASTRON (Netherlands)
Francois Hammer, Observatoire de Paris-Meudon (France)
David Horville, Observatoire de Paris-Meudon (France)
Jens Hjorth, Niels Bohr Institute (Denmark)
Lex Kaper, Univ. van Amsterdam (Netherlands)
Jens Klougart, Niels Bohr Institute (Denmark)
Per Kjaergaard-Rasmussen, Niels Bohr Institute (Denmark)
Jean-Louis Lizon, European Southern Observatory (Germany)
Michel Marteaud, Observatoire de Paris-Meudon (France)
Ruben Mazzoleni, INAF, Osservatorio Astronomico di Merate (Italy)
European Southern Observatory (Germany)
Niels Michaelsen, Niels Bohr Institute (Denmark)
Roberto Pallavicini, INAF, Osservatorio Astronomico di Palermo (Italy)
Florence Rigal, ASTRON (Netherlands)
Paolo Santin, INAF, Osservatorio Astronomico di Trieste (Italy)
Anton Norup Soerensen, Niels Bohr Institute (Denmark)
Paolo Spano, INAF, Osservatorio Astronomico di Palermo (Italy)
Lars Venema, ASTRON (Netherlands)
Pascal Vola, Observatoire de Paris-Meudon (France)
Filippo Maria Zerbi, INAF, Osservatorio Astronomico di Merate (Italy)


Published in SPIE Proceedings Vol. 5492:
Ground-based Instrumentation for Astronomy
Alan F. M. Moorwood; Masanori Iye, Editor(s)

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