The Ionized Gas of M33 as Seen with a 6-METER f1 Telescope

Details The Ionized Gas of M33 as Seen with a 6-METER f1 Telescope The Ionized Gas of M33 as Seen with a 6-METER f1 Telescope

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981msngr..23...15c&link_type=abstract

The Messenger, No.23, P. 15, 1981

Astronomy and Astrophysics

Astronomy

6

Scientific paper

With few exceptions, the ionized hydrogen regions in a galaxy are extended sources emitting only a few lines of very faint intensity. The use of a narrow interference filter (to select one of the most intense lines) in combination with a focal reducer design (to increase the illumination of the focal plane) at the focus of a large telescope is the best way to obtain deep photographs of the ionized hydrogen features in nearby galaxies (Courtes, G.: 1973, Vistas in Astronomy 14, 81). lt should be noted that in this optical arrangement, the filter is not set in the small f-number beam of the focal reducer, but in the lower aperture beam of the telescope, thus making possible the use of very selective interference filters (wh ich accept a very narrow angular field). This method has been extensively used for several years by Courtes and his co-workers at the 1.93 m telescope of Haute-Provence Observatory, at the Palomar 200 inch telescope, and, more recently, at the 3.6 m telescope of ESO.

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