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ASTRO: Zwicky's Connected Multiple System -- Arp 73
Arp 103 is also known as Zwicky's Connected Multiple System or Zwicky's
Triplet depending on who you read. It consists of three galaxies. They have many different designations, none all that common. NED prefers UGC 10586 Notes 3, UGC 10586 Notes 4 and UGC 10586 Noted 5. Also in the image are UGC 10586, UGC 10586 Notes 1 and UGC 10586 Notes 2. So by the UGC it is a 6 galaxy system. UGC 10586 notes 2 is better known as NGC 6241. These galaxies are located in the constellation of Hercules at a distance of about 425 million light years. It consists of two southern galaxies, Notes 3 and 4 and a northern galaxy 2.5 minutes north. A faint arm connects Notes 3 and 5. Several knots are seen in it. About half way between the two is another faint arm running at near right angles to the connecting arm which contains a broad extension on the western side. It is only hinted at in Arp's image but appears rather obvious in mine. Also not seen well in Arp's image is the large splash of stars that surrounds the southern pair. The knots in the connecting arm appear somewhat blue indicating new stars. Arp classed this triplet under Elliptical and elliptical-like galaxies connected to spirals. NED classes the three galaxies as: Notes 3 SAB(rs)0+ pec, Notes 4 S0 pec: and Notes 5 as SAB0^+(rs) pec in one reference. None are listed as elliptical but all as simply S0. So elliptical like fits but which is the spiral? His only comment just says: "Incomplete connection, blue knots in south member." My image seems to show the connection is complete, not only in the narrow tail but a fainter broad tail as well. You've probably guessed the other two major galaxies in the image are two of the three other parts of the UGC 10586 system. The bright spiral east of Arp 103 is UGC 10586 Notes 2, better known as NGC 6241, an Sbc spiral with lots of bright knots in its arms. They are more white than blue. Still, it looks like an active galaxy. It's red shift distance puts it at about 410 million light-years. The difference is likely just due to orbital motion about the groups center of gravity and really at about the same distance as Arp 103. UGC 10586 is the remaining face on spiral further east than NGC 6241. Why do all of these appear to be face on? The note at NED for this galaxy belongs with Arp 103 not this galaxy. UGC 10586 is a face on Sb spiral that has a rather faint arm compared to the others. Apparently that wasn't odd enough to make Arp's catalog. Sure seems unusual to me. It has a red shift distance of 424 million light-years, same as Arp 103. So where is the missing UGC 10586 Notes 1? It is the small blue galaxy just beyond the northeast edge of UGC 10586 near a bright yellow-white star. It seems rather distorted with both a blue and white region with an arm jutting out the south side. I can't find any distance or classification on this one. The red galaxy to the southwest of UGC 10586 is 2MASX J16504319+4523545, again not much on it. Why it too isn't listed as part of the UGC 10586 system I don't know. Unfortunately this paucity of information pertains to the rest of the image. Even though the SDSS lists nearly 3000 galaxies in this field only 5 of the 6 members of the UGC 10586 system have any redshift data. I found no SDSS images of this group on the net so made some from the SDSS site which are attached here at the same 1" per pixel resolution I took these at. I've also attached a 0.5" per pixel enlargement which on my monitor shows the connection between the southern and northern members of Arp 103 better than the original scale of 1" per pixel. Arp's image is at: http://nedwww.ipac.caltech.edu/level...ig_arp103.jpeg 14" LX200R @ f/10, L=4x10' RGB=2x10'x3, 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". |
#2
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ASTRO: Zwicky's Connected Multiple System -- Arp 73
Make that Arp 103.
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". |
#3
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ASTRO: Zwicky's Connected Multiple System -- Arp 73
Rick,
this is a weird assortment of galaxies. I also like the two spirals. Stefan "Rick Johnson" schrieb im Newsbeitrag . com... Arp 103 is also known as Zwicky's Connected Multiple System or Zwicky's Triplet depending on who you read. It consists of three galaxies. They have many different designations, none all that common. NED prefers UGC 10586 Notes 3, UGC 10586 Notes 4 and UGC 10586 Noted 5. Also in the image are UGC 10586, UGC 10586 Notes 1 and UGC 10586 Notes 2. So by the UGC it is a 6 galaxy system. UGC 10586 notes 2 is better known as NGC 6241. These galaxies are located in the constellation of Hercules at a distance of about 425 million light years. It consists of two southern galaxies, Notes 3 and 4 and a northern galaxy 2.5 minutes north. A faint arm connects Notes 3 and 5. Several knots are seen in it. About half way between the two is another faint arm running at near right angles to the connecting arm which contains a broad extension on the western side. It is only hinted at in Arp's image but appears rather obvious in mine. Also not seen well in Arp's image is the large splash of stars that surrounds the southern pair. The knots in the connecting arm appear somewhat blue indicating new stars. Arp classed this triplet under Elliptical and elliptical-like galaxies connected to spirals. NED classes the three galaxies as: Notes 3 SAB(rs)0+ pec, Notes 4 S0 pec: and Notes 5 as SAB0^+(rs) pec in one reference. None are listed as elliptical but all as simply S0. So elliptical like fits but which is the spiral? His only comment just says: "Incomplete connection, blue knots in south member." My image seems to show the connection is complete, not only in the narrow tail but a fainter broad tail as well. You've probably guessed the other two major galaxies in the image are two of the three other parts of the UGC 10586 system. The bright spiral east of Arp 103 is UGC 10586 Notes 2, better known as NGC 6241, an Sbc spiral with lots of bright knots in its arms. They are more white than blue. Still, it looks like an active galaxy. It's red shift distance puts it at about 410 million light-years. The difference is likely just due to orbital motion about the groups center of gravity and really at about the same distance as Arp 103. UGC 10586 is the remaining face on spiral further east than NGC 6241. Why do all of these appear to be face on? The note at NED for this galaxy belongs with Arp 103 not this galaxy. UGC 10586 is a face on Sb spiral that has a rather faint arm compared to the others. Apparently that wasn't odd enough to make Arp's catalog. Sure seems unusual to me. It has a red shift distance of 424 million light-years, same as Arp 103. So where is the missing UGC 10586 Notes 1? It is the small blue galaxy just beyond the northeast edge of UGC 10586 near a bright yellow-white star. It seems rather distorted with both a blue and white region with an arm jutting out the south side. I can't find any distance or classification on this one. The red galaxy to the southwest of UGC 10586 is 2MASX J16504319+4523545, again not much on it. Why it too isn't listed as part of the UGC 10586 system I don't know. Unfortunately this paucity of information pertains to the rest of the image. Even though the SDSS lists nearly 3000 galaxies in this field only 5 of the 6 members of the UGC 10586 system have any redshift data. I found no SDSS images of this group on the net so made some from the SDSS site which are attached here at the same 1" per pixel resolution I took these at. I've also attached a 0.5" per pixel enlargement which on my monitor shows the connection between the southern and northern members of Arp 103 better than the original scale of 1" per pixel. Arp's image is at: http://nedwww.ipac.caltech.edu/level...ig_arp103.jpeg 14" LX200R @ f/10, L=4x10' RGB=2x10'x3, 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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