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

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

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ycat.2249....0h&link_type=abstract

VizieR On-line Data Catalog: II/249. Originally published in: 2003ApJS..149..405H

Physics

Surveys, Photometry: H-Alpha

Scientific paper

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).

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