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An Imaging Survey of Northern Galactic Hα Emission with Arcminute Resolution

Published online by Cambridge University Press:  16 May 2016

Brian Dennison ,
John H. Simonetti  and
Gregory A. Topasna
Brian Dennison
Affiliation:
Martin Observatory, Institute for Particle Physics and Astrophysics, Physics Department, Virginia Tech, Blacksburg, VA 24061, USA; dennison@astro.phys.vt.edu
John H. Simonetti
Affiliation:
Martin Observatory, Institute for Particle Physics and Astrophysics, Physics Department, Virginia Tech, Blacksburg, VA 24061, USA; jhs@vt.edu
Gregory A. Topasna
Affiliation:
Martin Observatory, Institute for Particle Physics and Astrophysics, Physics Department, Virginia Tech, Blacksburg, VA 24061, USA; topasna@astro.phys.vt.edu
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Abstract

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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.

Keywords

surveysISM: bubblesISM: cloudsISM: HII regionsISM: structureISM: supernova remnants
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 15 , Issue 1 , 1998 , pp. 147 - 148
Copyright
Copyright © Astronomical Society of Australia 1998

References

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