There are short descriptions below each image.
Full resolution (42 MB):
Half resolution (11 MB):
This visualization is a false color image where H-alpha (including red continuum) is mapped to red, blue continuum (including some emission lines like [OIII]) is mapped to green and red continuum (without H-alpha) is mapped to blue, i.e. H-alpha emission nebulae appear reddish and reflection nebulae appear blue to green.
Stars in the continuum channels are partially subtracted in order to make the faint reflection nebulae visible. Further image processing steps are dynamic range compression using a nonlinear hi-pass filter and tonal curve correction.
Full resolution (48 MB):
Half resolution (10 MB):
This visualization is a false color image which only uses the H-alpha data (including some red continuum). It shows much more details of the emission nebulae than the image above.
After partial star subtraction the dynamic range was compressed using a non-linear hi-pass filter. That leads to a compression ratio r which is used to calculate the color as depicted in the legend. (The legend shows the compression c:=1-r). The luminance is determined by the tonal curve corrected result of the dynamic range compression.
Half resolution (12 MB):
This image comes close to a true color view. Red component shows red continuum including some (but reduced) H-alpha, green continuum is mapped to green and blue continuum is mapped to blue.
Unlike to the other images the stars are not subtracted. This makes the dark nebulae visible which cover the light from the stars behind.
The only image processing step after color composition was a tonal curve correction (no dynamic range compression).
Due to the lack of other details than stars the image is only presented at half resolution.
All image processing steps are deterministic, i.e. there is no manual retouching or any kind of non-reproducible adjustment.
Image data are:
|Center position:||RA: 5h28, DEC: 1°|
|Orientation:||North is up (exactly)|
|Scale:||10 arcsec/pixel (in center at full resolution)|
|FOV:||25°×34° (through center)|
|Exposure times:||H-alpha: 7.5d, continuum channels: 4.3d (sum of exposure times of all frames used to calculate the image)|