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ASTRO: Arp 112 A trio of weird galaxies
Arp 112 is a triple galaxy group classed by Arp as "Elliptical and
elliptical like galaxies with repelling arms." How that applies to this weird group I don't know. I placed Arp 112 well to the right of center to pick up another rather odd galaxy at the upper left hiding behind a star. It is CGCG 498-067 and is classed as a S0? galaxy. This seems very wrong. S0 galaxies have no or very weak spiral structure and usually appear as round spheres or spindle like depending on our viewing angle. This looks like a rather nice face on Sb spiral with rather well defined arms. I don't understand the discrepancy. It is about 212 million light years away based on red shift. Just a bit farther than Arp 112 so likely part of the same group. Arp 112's trio of galaxies from left to right are KUG 2359+311 with no red shift data. KUG stands for Kiso Ultraviolet Galaxy Catalogue indicating it is a strong emitter of ultraviolet light. Usually a sign of massive star formation. It looks like an arc but is classed simply as a spiral galaxy, not even a peculiar one. Sure looks peculiar to me. The center galaxy is NGC 7806 with a red shift distance of 203 million light years and is classed as SA(rs)bc? Pec. While tidally distorted it doesn't appear as peculiar as its companion to the east. The class indicates it has structures of both a standard spiral and a ring galaxy. Apparently the ring refers to the outer football shaped bright edge around much of the galaxy. The rightmost galaxy is NGC 7805 at 205 million light years per its red shift. It is classed as SAB0 pec but has no ring designation yet one is quite prominent in my image. That I do find as peculiar. Its class would indicate it has elements of a standard spiral and a barred spiral with little dust or arm structure. Hence Arp's elliptical like reference. It also has the color of an elliptical as well. Nearly all the other galaxies are either anonymous or have little data. The only one worth mentioning is the blue galaxy southwest of Arp 112. It has the rather rare designation NPM1G +31.0507. This comes from the Lick "Northern Proper Motion program 1st list of Galaxies. Don't ask, I never heard of it either. Arp 112 is located in Pegasus not far from Arp 98 and right beside Alpha Andromedae, Alphoratz, the lower left corner star of the "Great Square of Pegasus" for those in the northern hemisphere that is. Arp's photo of it is at http://nedwww.ipac.caltech.edu/level...ig_arp112.jpeg 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 112 A trio of weird galaxies
Phantastic picture Rick. And so much stuff floating in the background.
Stefan "Rick Johnson" schrieb im Newsbeitrag ster.com... Arp 112 is a triple galaxy group classed by Arp as "Elliptical and elliptical like galaxies with repelling arms." How that applies to this weird group I don't know. I placed Arp 112 well to the right of center to pick up another rather odd galaxy at the upper left hiding behind a star. It is CGCG 498-067 and is classed as a S0? galaxy. This seems very wrong. S0 galaxies have no or very weak spiral structure and usually appear as round spheres or spindle like depending on our viewing angle. This looks like a rather nice face on Sb spiral with rather well defined arms. I don't understand the discrepancy. It is about 212 million light years away based on red shift. Just a bit farther than Arp 112 so likely part of the same group. Arp 112's trio of galaxies from left to right are KUG 2359+311 with no red shift data. KUG stands for Kiso Ultraviolet Galaxy Catalogue indicating it is a strong emitter of ultraviolet light. Usually a sign of massive star formation. It looks like an arc but is classed simply as a spiral galaxy, not even a peculiar one. Sure looks peculiar to me. The center galaxy is NGC 7806 with a red shift distance of 203 million light years and is classed as SA(rs)bc? Pec. While tidally distorted it doesn't appear as peculiar as its companion to the east. The class indicates it has structures of both a standard spiral and a ring galaxy. Apparently the ring refers to the outer football shaped bright edge around much of the galaxy. The rightmost galaxy is NGC 7805 at 205 million light years per its red shift. It is classed as SAB0 pec but has no ring designation yet one is quite prominent in my image. That I do find as peculiar. Its class would indicate it has elements of a standard spiral and a barred spiral with little dust or arm structure. Hence Arp's elliptical like reference. It also has the color of an elliptical as well. Nearly all the other galaxies are either anonymous or have little data. The only one worth mentioning is the blue galaxy southwest of Arp 112. It has the rather rare designation NPM1G +31.0507. This comes from the Lick "Northern Proper Motion program 1st list of Galaxies. Don't ask, I never heard of it either. Arp 112 is located in Pegasus not far from Arp 98 and right beside Alpha Andromedae, Alphoratz, the lower left corner star of the "Great Square of Pegasus" for those in the northern hemisphere that is. Arp's photo of it is at http://nedwww.ipac.caltech.edu/level...ig_arp112.jpeg 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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