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Astro: Arp 15
Arp 15 (NGC 7393) is classed as a SB(rs)C pec spiral galaxy. Pec means
peculiar in that it certainly isn't a normal galaxy. It also has a ring structure. In this case the ring is broken and partly made of enormous blue star clusters. Arp classified it under the heading of "spiral galaxies with detached segments". This appears to apply to the star clusters in the broken ring. Obviously this galaxy has interacted with another but where is it? I found little in the literature about this one. It is about 156 million light years away based on red shift data. You can see a shot of it by Arp with the 200" Palomar telescope at http://nedwww.ipac.caltech.edu/level...ures/arp15.gif Even though seeing that night was awful I did image it at 0.5" per pixel rather than my normal 1" but see now that was a mistake. I just increased noise with no resolution gain. I've reduced this to 0.75" but it still is very fuzzy. It's on my reshoot list but for now this will have to do. 14" LX200R @ f/10, L=4x10 RGB 2x10, STL-11000XM, Paramount ME Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
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Astro: Arp 15
Rick, lots of detail in this small guy, in spite of the bad seeing.
Stefan "Rick Johnson" schrieb im Newsbeitrag ster.com... Arp 15 (NGC 7393) is classed as a SB(rs)C pec spiral galaxy. Pec means peculiar in that it certainly isn't a normal galaxy. It also has a ring structure. In this case the ring is broken and partly made of enormous blue star clusters. Arp classified it under the heading of "spiral galaxies with detached segments". This appears to apply to the star clusters in the broken ring. Obviously this galaxy has interacted with another but where is it? I found little in the literature about this one. It is about 156 million light years away based on red shift data. You can see a shot of it by Arp with the 200" Palomar telescope at http://nedwww.ipac.caltech.edu/level...ures/arp15.gif Even though seeing that night was awful I did image it at 0.5" per pixel rather than my normal 1" but see now that was a mistake. I just increased noise with no resolution gain. I've reduced this to 0.75" but it still is very fuzzy. It's on my reshoot list but for now this will have to do. 14" LX200R @ f/10, L=4x10 RGB 2x10, STL-11000XM, Paramount ME Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
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