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Arp 113 A cluster of bright galaxies
Arp 113 is also in the Arp class "Elliptical or Elliptical-like Galaxies
close to perturbing spirals". In fact it's the first entry in that class. There are so many galaxies in this grouping I don't know which are the perturbing spirals! The entire group is larger than my field though Arp only was concerned with the dense core. It is known as the VV166 group with 15 members. VV stands for; Vorontsov-Velyaminov Interacting Galaxies. The group's average distance is 296 MLY Many of the members are NGC galaxies. I've attached an annotated small image of the core to help identify this region. The galaxies, their classification (when known, "n/a" when not available at NED) and their red shift distance in millions of light years is in the table below. NGC 67 E 288 NGC 67A E 269 NGC 68 SA0 239 NGC 69 SB(s)0 290 NGC 70 SB(s)0 311 NGC 71 SA0- pec 290 NGC 72 SB(rs)ab 316 NGC 72A E3 291 NGC 74 n/a 308 SRGb 062.050 n/a 326 Other galaxies in the image with red shift data: CGCG 499-103 below SRGb 062.050 n/a 264 MLY CGCG 499-101 by bright yellow star upper right n/a 284 MLY CGCG 499-100 blue galaxy beyond CGCG 449-101 at upper edge Scd 206 MLY CGCG 499-099 blue spiral upper right corner S? 272 MLY NGC 76 Lower left edge S? 309 MLY The galaxy just left of NGC 72A isn't listed by NED, SIMBAD or SUPERLEDA that I could find. Nor were most of the other galaxies in the full image. Arp's image: http://nedwww.ipac.caltech.edu/level...ig_arp113.jpeg 14" LX200R @ f/10, L=10x10' RGB=2x10', STL-11000XM, Paramount ME The Lum flats for this image were awful and I didn't catch it before cleaning the filters so no way to redo them. Color flats were fine so I stacked lum and color frames to make a pseudo lum in which the flat problems were somewhat reduced by the good color data. Color by itself was too weak to make a pseudo flat without the lum frames. Background is unusually dark to hide the flat problems. Fortunately the area around the center of the cluster was mostly free of flat issues. I'll add this to the ever growing retake file for next year but it is lost in the sun for now. Red frames were somewhat hit by a haze as well. I had to do a lot of compensating for that as well. It's amazing what you can salvage when you have to! 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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Arp 113 A cluster of bright galaxies
Very nice and interesting picture Rick. This is a really dense cluster.
Stefan "Rick Johnson" schrieb im Newsbeitrag ster.com... Arp 113 is also in the Arp class "Elliptical or Elliptical-like Galaxies close to perturbing spirals". In fact it's the first entry in that class. There are so many galaxies in this grouping I don't know which are the perturbing spirals! The entire group is larger than my field though Arp only was concerned with the dense core. It is known as the VV166 group with 15 members. VV stands for; Vorontsov-Velyaminov Interacting Galaxies. The group's average distance is 296 MLY Many of the members are NGC galaxies. I've attached an annotated small image of the core to help identify this region. The galaxies, their classification (when known, "n/a" when not available at NED) and their red shift distance in millions of light years is in the table below. NGC 67 E 288 NGC 67A E 269 NGC 68 SA0 239 NGC 69 SB(s)0 290 NGC 70 SB(s)0 311 NGC 71 SA0- pec 290 NGC 72 SB(rs)ab 316 NGC 72A E3 291 NGC 74 n/a 308 SRGb 062.050 n/a 326 Other galaxies in the image with red shift data: CGCG 499-103 below SRGb 062.050 n/a 264 MLY CGCG 499-101 by bright yellow star upper right n/a 284 MLY CGCG 499-100 blue galaxy beyond CGCG 449-101 at upper edge Scd 206 MLY CGCG 499-099 blue spiral upper right corner S? 272 MLY NGC 76 Lower left edge S? 309 MLY The galaxy just left of NGC 72A isn't listed by NED, SIMBAD or SUPERLEDA that I could find. Nor were most of the other galaxies in the full image. Arp's image: http://nedwww.ipac.caltech.edu/level...ig_arp113.jpeg 14" LX200R @ f/10, L=10x10' RGB=2x10', STL-11000XM, Paramount ME The Lum flats for this image were awful and I didn't catch it before cleaning the filters so no way to redo them. Color flats were fine so I stacked lum and color frames to make a pseudo lum in which the flat problems were somewhat reduced by the good color data. Color by itself was too weak to make a pseudo flat without the lum frames. Background is unusually dark to hide the flat problems. Fortunately the area around the center of the cluster was mostly free of flat issues. I'll add this to the ever growing retake file for next year but it is lost in the sun for now. Red frames were somewhat hit by a haze as well. I had to do a lot of compensating for that as well. It's amazing what you can salvage when you have to! 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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