SIMBAD references

We have completed a robotic wide-angle imaging survey of the southern sky (δ=+15° to -90°) at 656.3 nm wavelength, the Hα emission line of hydrogen. Each image of the resulting Southern Hα Sky Survey Atlas (SHASSA) covers an area of the sky 13° square at an angular resolution of approximately 0'.8 and reaches a sensitivity level of 2 R (1.2x10^–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 microwave free-free emission of 12 µK at 30 GHz. Smoothing over several pixels allows features as faint as 0.5 R to be detected.