A Robotic Wide-Angle H-Alpha Survey of the Southern Sky
J. E. Gaustad, P. R. McCullough, W. Rosing, D. Van Buren
Abstract
We have completed a robotic wide-angle imaging survey of the southern sky (declination less than +15 degrees) at 656.3 nm wavelength, the H-alpha emission line of hydrogen. Each image of the resulting Southern H-Alpha Sky Survey Atlas (SHASSA) covers an area of the sky 13 degrees square at an angular resolution of approximately 0.8 arcminute, and reaches a sensitivity level of 2 rayleigh (1.2 x 10-17 erg cm-2 s-1 arcsec-2) per pixel, corresponding to an emission measure of 4 cm-6 pc, and to a brightness temperature for microwave free-free emission of 12 microkelvins at 30 GHz. Smoothing over several pixels allows features as faint as 0.5 rayleigh to be detected.
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