A robotic wide-angle h alpha survey of the southern sky

Citation
Je. Gaustad et al., A robotic wide-angle h alpha survey of the southern sky, PUB AST S P, 113(789), 2001, pp. 1326-1348
Citations number
47
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
ISSN journal
0004-6280 → ACNP
Volume
113
Issue
789
Year of publication
2001
Pages
1326 - 1348
Database
ISI
SICI code
0004-6280(200111)113:789<1326:ARWHAS>2.0.ZU;2-B
Abstract
We have completed a robotic wide-angle imaging survey of the southern sky ( delta = +15 degrees to -90 degrees) at 656.3 nm wavelength, the H alpha emi ssion line of hydrogen. Each image of the resulting Southern H alpha Sky Su rvey Atlas (SHASSA) covers an area of the sky 13 degrees square at an angul ar resolution of approximately 0.'8 and reaches a sensitivity level of 2 R (1.2 x 10(-17) ergs cm(-2) s(-1) arcsec(-2)) pixel(-1), corresponding to an emission measure of 4 cm(-6) pc and to a brightness temperature for microw ave free-free emission of 12 muK at 30 GHz. Smoothing over several pixels a llows features as faint as 0.5 R to be detected.