UV imaging

[RB (Andrew)]

That's sooo cool Marc!!!
I wacked on some Banana Boat SPF50+ just to be on the safe side.

And now you've got me singing "Day-O"....

[multiweb (Marc)]

Originally Posted by topheart

Fascinating stuff there Marc!!

Cheers,
Tim

Thanks Tim.

Originally Posted by RB

That's sooo cool Marc!!!
I wacked on some Banana Boat SPF50+ just to be on the safe side.

And now you've got me singing "Day-O"....

Thanks mate. The SPF50+ filter. Now I reckon you're onto something.

[codemonkey (Lee)]

Very cool Marc! I don't recall seeing any amateur UV images before. Thanks for sharing!

[marc4darkskies (Marcus)]

Very interesting Marc!! Given the earth atmosphere's relative opacity to UV and the poor QE of the camera at wavelengths less than 400nm, I'm surprised the result is so good. In any case, I'd guess what you're seeing is predominantly UV scattering from dust in the neb. A casual inspection suggests that the brightest UV responses come from the vicinity of the most luminous stars embedded near the dustiest parts of the neb.

[Placidus (Mike and Trish)]

Originally Posted by marc4darkskies

Very interesting Marc!! Given the earth atmosphere's relative opacity to UV and the poor QE of the camera at wavelengths less than 400nm, I'm surprised the result is so good. In any case, I'd guess what you're seeing is predominantly UV scattering from dust in the neb. A casual inspection suggests that the brightest UV responses come from the vicinity of the most luminous stars embedded near the dustiest parts of the neb.

That makes complete sense.

[multiweb (Marc)]

Originally Posted by codemonkey

Very cool Marc! I don't recall seeing any amateur UV images before. Thanks for sharing!

Thanks Lee.

Originally Posted by marc4darkskies

Very interesting Marc!! Given the earth atmosphere's relative opacity to UV and the poor QE of the camera at wavelengths less than 400nm, I'm surprised the result is so good. In any case, I'd guess what you're seeing is predominantly UV scattering from dust in the neb. A casual inspection suggests that the brightest UV responses come from the vicinity of the most luminous stars embedded near the dustiest parts of the neb.

Thanks Marc. Yeah I didn't know what to expect at first but then when the first sub came in there was some signal in there and based on how much I had in 10min I kept going knowing I could make something out of it. I read that reflection nebs show up in UV. Emission lines Ha and others don't(?). There is a small Ha pic in the UV range in the filter spectrum for Ha. Not sure if Ha contamination is possible. I don't know enough about it. Maybe somebody can chime in.

There's a single 10min uncalibrated raw sub here if you want to have a look at it.

[multiweb (Marc)]

Originally Posted by Placidus

That makes complete sense.

Here's what ~1.5h on M42 looks like in 5min subs.

[cometcatcher (Kevin)]

That's very cool, but slow! I wouldn't have the patience, or sky for it.

[Atmos (Colin)]

CII has two UV emission lines between 320&380nm so it could be those that you’re seeing. You’d expect to find CII in and around star forming regions; NGC 3372 and M42.

[multiweb (Marc)]

Originally Posted by cometcatcher

That's very cool, but slow! I wouldn't have the patience, or sky for it.

not going anywhere lately. UV imaging will keep me sane.

Originally Posted by Atmos

CII has two UV emission lines between 320&380nm so it could be those that you’re seeing. You’d expect to find CII in and around star forming regions; NGC 3372 and M42.

Good stuff. Gotta do some more read up.
Did some IR last night and the night before with the CN-212. Plenty of that and fairly easy to get at that FL too surprisingly.

[Merlin66 (Ken)]

C II doesn't come up on my data base as significant...
Have a look at the typical nebulae spectrum.

[Atmos (Colin)]

Originally Posted by Merlin66

C II doesn't come up on my data base as significant...
Have a look at the typical nebulae spectrum.

My mistake, I was looking at 133nm haha

Attached is a table of all of the emission lines from 320nm to 380nm. They’re in angstroms which is nm*10 so the 3444 angstrom OIII line is 344.4nm.

As Ken shows, many of the emission lines aren’t strong but it gives you an indication of how many potentials there are.

[Merlin66 (Ken)]

http://arxiv.org/ftp/arxiv/papers/1208/1208.0380.pdf
This is the listing we generally use....