VizieR Online Data Catalog: WHAM Northern Sky Survey, V-1.1 (Haffner+, 2003)
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).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- August 2003
- Bibcode:
- 2003yCat.2249....0H
- Keywords:
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- Surveys;
- Photometry: H-alpha