Quote:
Originally Posted by madbadgalaxyman
Hi Russell,
I am very happy with your image of NGC 1300.....short exposures are great!!
Often, the most interesting parts of galaxies are their centralmost parts, and these parts can be well and truly burnt out on long exposures.
Your image clearly shows a feature of NGC 1300 which is not so easily seen on the typical long exposure of this galaxy with a CCD camera.....the central ring of supergiant star forming regions.
Here is the tight innermost ring in NGC 1300, in an exposure with the VLT (used with the EFOSC2 instrument):
Attachment 129855
Here is a low resolution version of a Hubble Space Telescope image (taken with the F435W filter)(similar to a blue-sensitive Johnson "B" photometric filter) showing this innermost ring of young bright stars and clusters:
Attachment 129856
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In fact, it is the shortness of your exposures that makes this central feature stand out so very much!
I forget how large, in angular terms, this small central ring is, but it seems to me it might be observable visually.
cheers
bad galaxy man
The tight rings immediately surrounding the central starlike nuclei of galaxies are sometimes known, "in the trade", as "circumnuclear starbursts or "circumnuclear starburst rings. ("nuclear rings" is another way they are known.)
Ring structures often occur at various spatial scales, and a single galaxy can have several different rings within it;
for instance, the two main spiral arms of NGC 1300, when traced out a long way (to very faint levels), curve around to form a ring structure (a nearly complete ring).
Ring structures in galaxies were described by Buta and Combes, in Fund. Cosmic Physics, 1996, vol. 17, p.95;
http://ned.ipac.caltech.edu/level5/Rings/paper.pdf
Another useful guide to the variety of ring phenomena is the "De Vaucouleurs Atlas of Galaxies" |
wow, thanks mad bad galaxy man! thats a fantastic amount of information! thanks for taking the time out to fill us in! I did recall reading the nucleus was a 'grand-design spiral nucleus' didn't get much further. I will probably be able to bring some more detail out with some processing ... now that i know what i'm looking for
Quote:
Originally Posted by Stu Ward
Nice Dob Imagery my friend
I have done a few myself, amazing what you can get out of a non astrophotography scope
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Thanks Stu, yep the tracking on these goto dobs are pretty impressive for what they are, and modern dslr's have come a long way.
I tried updating my CS6 with the HLVG plugin but it hasn't worked... hmmm will try again tonight.