WHAM Northern Sky Survey, V-1.1 (Haffner+, 2003)

Type Journal Article
Names L. M. Haffner, R. J. Reynolds, S. L. Tufte, G. J. Madsen, K. Jaehnig, J. W. Percival
Publication VizieR Online Data Catalog
Volume 2249
Date August 1, 2003
URL http://adsabs.harvard.edu/abs/2003yCat.2249....0H
Library Catalog NASA ADS
Abstract The Wisconsin Hα Mapper has been designed to produce a survey of Hα emission from the interstellar medium (ISM) over the entire northern sky. The instrument combines a 0.6 meter telescope and a dual-etalon 15cm Fabry-Perot spectrometer. In the primary spectral mode, an exposure captures a 200km/s spectral region with 8-12km/s velocity resolution from a one-degree beam on the sky. With a large-aperture design and modern CCD technology, WHAM can detect Galactic emission as faint as 0.05 Rayleighs in a 30 second exposure. For gas at 10000K, this observed intensity corresponds to an emission measure of about 0.1cm-6pc, more than 10 million times fainter than the Orion Nebula. (1 data file).
Tags Photometry: H-alpha, surveys
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