Wide-field kinematic H-alpha observations of the Milky Way with a scanning and imaging Fabry-Perot - Preliminary results

Details Wide-field kinematic H-alpha observations of the Milky Way with a scanning and imaging Fabry-Perot - Preliminary results Wide-field kinematic H-alpha observations of the Milky Way with a scanning and imaging Fabry-Perot - Preliminary results

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...145..221c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 145, no. 1, April 1985, p. 221-226.

Astronomy and Astrophysics

Astrophysics

3

Fabry-Perot Interferometers, H Alpha Line, Interstellar Matter, Milky Way Galaxy, Radial Velocity, Spectrophotometry, Data Reduction, Imaging Techniques, Kinematics, Optical Scanners, Orion Nebula, Television Systems

Scientific paper

A new method has been developed for the large-scale kinematic study of Galactic H-alpha. A scanning Fabry-Perot interferometer is used with a wide-field optical system, and the interference rings are recorded with a photon-counting television camera. The Fabry-Perot scan is synchronized with the photon-counting acquisition. Data reduction produces a sequence of n wide-field monochromatic images, with a radial velocity spacing given by the fraction 1/n of the interferometer's free spectral range. Reduction is effected by 'photon sorting', a method which differs from that employed for Taurus by Atherton et al. (1982). This procedure has been successfully tested on the sky, in spite of a very short total integration time (10 min). Twenty-five monochromatic images of a 15 deg x 17.5 deg field in Orion have been reconstituted over a range of + or - 174 km/s with respect to the rest wavelength of H-alpha, with a step of 14.5 km/s.

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