Celestial hemisphere:  Northern  ·  Constellation: Draco (Dra)  ·  Contains:  NGC 4236
NGC 4236 Galaxy in Draco Bi-colour UV & NIR, Mike Oates
NGC 4236 Galaxy in Draco Bi-colour UV & NIR
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NGC 4236 Galaxy in Draco Bi-colour UV & NIR

NGC 4236 Galaxy in Draco Bi-colour UV & NIR, Mike Oates
NGC 4236 Galaxy in Draco Bi-colour UV & NIR
Powered byPixInsight

NGC 4236 Galaxy in Draco Bi-colour UV & NIR

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Description

I have been experimenting with an Astrodon SLOAN U filter which passes Ultraviolet in the 320-385 nm wavelength. Long exposures are needed as well as lots of them as the amount of UV from Deepsky objects is rather low. I started with bin 4x4 images just to get some data to see what was there, but that meant I had a low resolution image. So further images at bin 2x2 were taken then even more at 1x1 to get more detail.

I have put this image together as a bi-colour image to highlight the UV against the Near Infrared to give the greatest contrast.

UV is given more from new stars, so this image is highlighting the areas in the galaxy where there is new star formation.

All the i’ and NIR-L subs were combined together and the resulting two images UV and NIR were made into a bi-colour image in PI with PixelMath;

Red = NIR

Green = (NIR*0.4)+(UV*0.6)

Blue = UV*1.1

I also have a full colour version of this galaxy [url= https://www.astrobin.com/295628/]here[/url].

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Sky plot

Sky plot

Histogram

NGC 4236 Galaxy in Draco Bi-colour UV & NIR, Mike Oates