A Robotic Wide-Angle H<i>α</i> Survey of the Southern Sky

摘要

Abstract We are conducting a robotic wide-angle imaging survey of the southern sky at 656.3 nm wavelength, the H α emission line of hydrogen. Each image of the survey covers an area of the sky 13° square at an angular resolution of approximately one arcminute, and reaches a sensitivity level of 0.5 Rayleigh (3 × 10 −18 erg cm −2 s −1 arcsec −2 ), corresponding to an emission measure of 1 cm −6 pc , and to a brightness temperature for microwave free-free emission of 3 µK at 30 GHz .