The Northern Sky Narrowband Survey maps the entire northern
hemisphere down to a declination of -16° in the light of the emission
lines H-alpha (656.3 nm), [OIII] (500.7 nm) and [SII] (671.7 nm and
673.0 nm). The usable angular resolution (FWHM of a point source) is
about 10 arcseconds.
This resource contains an ancillary continuum survey as sell as
compositions with the narrow line imagery. The narrow line HIPSes are
available from ivo://org.gavo.dc/nsns/q.
The Northern Sky Narrowband Survey maps the entire northern
hemisphere down to a declination of -16° at an angular resolution of
about 10 arcsec.
Estimated variance (square noise) of visual continuum (HiPS
simg.de/P/NSNS/DR0_2/vc) normalized to 30" pixels. Use these data to
assess the accuracy of the star and H-alpha subtracted continuum,
which is mainly determined by photon noise, whether from the signal of
interest or from contamination.
The Northern Sky Narrowband Survey maps the entire northern
hemisphere down to a declination of -16° at an angular resolution of
about 10 arcsec.
Star-subtracted visible continuum as a combination of the red, green,
and blue color channel in Rayleighs per nm. H-alpha was subtracted,
but the data still contains some emission from SII, OIII and H-beta.
See http://www.simg.de/nebulae3/dr0_2 for other HIPS.
The Northern Sky Narrowband Survey maps the entire northern
hemisphere down to a declination of -16° at an angular resolution of
about 10 arcsec.
Red, green and blue continuum with partially subtracted stars as
compressed 8-bit color HIPS for easy visualization. See
http://www.simg.de/nebulae3/dr0_2 for other data sets.
