Report on the last observing run of multiobject spectroscopy. OPTOPUS is alive and kicking.

Details Report on the last observing run of multiobject spectroscopy. OPTOPUS is alive and kicking. Report on the last observing run of multiobject spectroscopy. OPTOPUS is alive and kicking.

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989msngr..55...62a&link_type=abstract

The Messenger, vol. 55, p. 62-64

Other

11

Spectroscopy: Faint Galaxies

Scientific paper

The ESO fibre facility for multiobject spectroscopy at the Cassegrain focus of the 3.6-m telescope, OPTOPUS, has been operating since March 1985. A complete description of the system is given in the ESO Operating Manual No. 6. It is possible to observe with OPTOPUS a maximum of 52 objects distributed over a field of 33'. Special aperture plates are prepared in advance of the observations in the ESO workshop from accurate alpha and delta coordinates of the selected objects. These plates are eventually mounted at the telescope and the fibres are manually inserted in the apertures; at the other end they form the entrance slit of a CCD spectrograph. In the last four years OPTOPUS has been used in 33 nights for 14 different programmes. It has always operated with high reliability, collecting some 6,000 spectra. The limiting magnitudes at a resolving power of about 500 in the visual are about 18.5 for galaxies and 20 for quasars in a two-hour exposure. While these limits allow useful work for a large number of programmes, there are two aspects of the present system which must be considered as unsatisfactory: the poor blue-UV transmission of the fibres and the reduced efficiency of a number of them, mainly due to imperfect centring of the microienses at their input ends. As the interest in using the facility is actually increasing (see e.g., DAEC Workshop, 1988), ESO started a programme to improve the weak points while keeping the basic conceptunchanged.

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