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ASTRO: NGC 0151
NGC 151 is an SB(r)bc spiral in western Cetus about 160 million
light-years from us. It seems to have possibly fit into Arp's class for galaxies with a split arm as the western one does split into two arms and the eastern one seems to divide into two widely spaced arms, one drawn out that apparently has a galaxy on its arm that would fit his categories for spiral galaxies with high surface brightness companions on their arms. In this case the red shift of the companion is rather different so it may not be a true companion but many in these two categories had redshifts that were quite different from the spiral galaxy. Though this was likely unknown to Arp at the time. I'm rather surprised Arp didn't include this one in his atlas of peculiar galaxies. Thanks to its drawn out arm the galaxy is nearly 150,000 light-years wide which is very large for a spiral galaxy. The companion is a near dwarf galaxy at a bit less than 20,000 light-years in diameter. The HST has taken a few infra red images of the galaxy but I didn't find them very interesting so didn't process them into an image. If interested you can look them up on the HST Legacy site http://hla.stsci.edu/ . The only other galaxy of any size in the image is MCG-02-02-050 which is hiding behind a foreground in the lower right corner of my image. It appears to be a spiral galaxy though NED made no attempt to categorize it. There are 5 quasar candidates in the image identified as UvES in the annotated image. Also near the top of the image is an anonymous galaxy from the UK Automatic Plate Measurement survey that looks for all the world like a faint asteroid trail. I have nothing on it but its position. This is another example of an image taken on a night of very poor transparency and not so good seeing. The color data got hit rather hard, especially the red channel so star colors are highly suspect. I tried twice to retake the RGB data but due to its rather low (for me) declination those attempts were not even usable. I had to go with what I had. This is my first 2013 image. It might be a new year but its the same old poor imaging conditions. Yet another on the reshoot list! 14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME Rick -- Prefix is correct. Domain is arvig dot net |
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ASTRO: NGC 0151
Rick,
that's a beautiful image. Unfortunately the galaxy is at -9 degrees, so not for me... Stefan "Rick Johnson" schrieb im Newsbeitrag ... NGC 151 is an SB(r)bc spiral in western Cetus about 160 million light-years from us. It seems to have possibly fit into Arp's class for galaxies with a split arm as the western one does split into two arms and the eastern one seems to divide into two widely spaced arms, one drawn out that apparently has a galaxy on its arm that would fit his categories for spiral galaxies with high surface brightness companions on their arms. In this case the red shift of the companion is rather different so it may not be a true companion but many in these two categories had redshifts that were quite different from the spiral galaxy. Though this was likely unknown to Arp at the time. I'm rather surprised Arp didn't include this one in his atlas of peculiar galaxies. Thanks to its drawn out arm the galaxy is nearly 150,000 light-years wide which is very large for a spiral galaxy. The companion is a near dwarf galaxy at a bit less than 20,000 light-years in diameter. The HST has taken a few infra red images of the galaxy but I didn't find them very interesting so didn't process them into an image. If interested you can look them up on the HST Legacy site http://hla.stsci.edu/ . The only other galaxy of any size in the image is MCG-02-02-050 which is hiding behind a foreground in the lower right corner of my image. It appears to be a spiral galaxy though NED made no attempt to categorize it. There are 5 quasar candidates in the image identified as UvES in the annotated image. Also near the top of the image is an anonymous galaxy from the UK Automatic Plate Measurement survey that looks for all the world like a faint asteroid trail. I have nothing on it but its position. This is another example of an image taken on a night of very poor transparency and not so good seeing. The color data got hit rather hard, especially the red channel so star colors are highly suspect. I tried twice to retake the RGB data but due to its rather low (for me) declination those attempts were not even usable. I had to go with what I had. This is my first 2013 image. It might be a new year but its the same old poor imaging conditions. Yet another on the reshoot list! 14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME Rick -- Prefix is correct. Domain is arvig dot net |
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