An Imaging Survey of Northern Galactic Hα Emission with Arcminute Resolution

Autor:	Brian Dennison, John H. Simonetti, G. A. Topasna
Rok vydání:	1998
Předmět:	Physics Brightness Active galactic nucleus Milky Way Cosmic microwave background Astronomy Astronomy and Astrophysics Cosmic ray Quasar Astrophysics Galactic plane 01 natural sciences Galaxy Space and Planetary Science 0103 physical sciences 010303 astronomy & astrophysics
Zdroj:	Publications of the Astronomical Society of Australia. 15:147-148
ISSN:	1448-6083 1323-3580
DOI:	10.1071/as98147
Popis:	We present preliminary results from a high-resolution, high-sensitivity imaging survey of the northern galactic Hα emission. The survey is carried out using the Spectral Line Imaging Camera (SLIC) which incorporates a fast (f/1·2) lens attached to a cryogenic CCD in combination with a narrowband interference filter. The pixel size is 1·6 arcminutes and the diameter of each field is 10°. The fast optics, narrow bandpass (1·7 nm) filter, and high quantum-efficiency, low-noise CCD yield a high brightness sensitivity to Hα emission on arcminute scales. This gives an equivalent sensitivity to emission measure structure below 1 pc cm−6. Some faint features detected include a supershell connected with the star forming region W4 extending 7° above the galactic plane, and filaments possibly related to galactic loops II and III. In addition, we have carried out deep observations of fields in which anisotropies in the cosmic microwave background radiation have been detected. Our observations place stringent limits upon the contribution to the apparent microwave fluctuations from free–free emission in the galactic foreground.
Databáze:	OpenAIRE
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