Southern H-Alpha Sky Survey Atlas (SHASSA)
The Southern H-Alpha Sky Survey Atlas is the product of a wide-angle digital imaging survey of the H-alpha emission from the warm ionized interstellar gas of our Galaxy. The survey covers the southern hemisphere (declinations less than +15 degrees). The observations were taken with a robotic camera operating at Cerro Tololo Inter-American Observatory (CTIO) in Chile.
Four maps are available for this survey : H-alpha, Continuum, Continuum-Corrected (the difference of the H-alpha and Continuum images) and Smoothed Continuum-Corrected (median filtererd to 5 pixels, or 4.0 arcminute resolution to remove star residuals better). The original angular resolution is ~1 arcminute and units of the maps are dR.
Healpix maps made by D. Paradis.
Reference
- 'A Robotic Wide-Angle Halpha Survey of the Southern Sky' by Guastad, J. E. et al, 2001, PASP, 113, 1326. http://adsabs.harvard.edu/abs/2001PASP..113.1326G
Maps
- H-alpha: SHASSA_HA_1_8192_partial.fits
- H-alpha Continuum-Subtracted: SHASSA_1_8192_partial.fits
- Continuum: SHASSA_CONT_1_8192_partial.fits
- Smoothed Continuum-Subtracted: SHASSA_SM_1_4096.fits
| SHASSA H-alpha | SHASSA Continuum |
|---|---|
HiPS
SHASSA HiPS are available in Aladin Collections/Image