
TY  - JOUR
A1  - Dennison, Brian 
A1  - Topasna, Gregory A 
A1  - Simonetti, John H 
T1  - An Imaging Survey of Northern Galactic Halpha Emission with Arcminute Resolution
JF  - Publications of the Astronomical Society of Australia
JO  - Publ. Astron. Soc.  Aust.
Y1  - 1998
VL  - 15
IS  - 1
SP  - 147
EP  - 148
KW  - 
UR  - https://doi.org/10.1071/AS98147 
N2  - We present preliminary results from a high-resolution, high-sensitivity imaging survey of the northern galactic Halpha 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 Halpha 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. 
ER  -

