mfoylan
Arp Peculiar Object Number 297 - Multiple Galaxies With Long Filaments
NGC 5755 (= PGC 52690)
(with NGC 5752, 5753 and 5754 = Arp 297)
Discovered (Apr 1, 1878) by Lawrence Parsons, 4th Lord Rosse
A 14th-magnitude spiral galaxy (type SBd?) in Boötes (RA 14 45 24.5, Dec +38 46 49)
Historical Identification:
Physical Information: Based on a recessional velocity of 9660 km/sec, NGC 5755 is about 450 million light years away. Given that and its apparent size of 1.3 by 1.0 arcmin, it is about 170 thousand light years across. Although in the same general direction as the interacting pair NGC 5754 and 5752, NGC 5755 has no connection to those galaxies, being over twice as far away. Despite that, it is considered a part of galaxy quartet Arp 297, as Arp's catalog was based only on the visual appearance of galaxies and groups of galaxies, and not whether they were actually physically related to each other. However, as indicated by its distorted shape, NGC 5755 probably is interacting with NGC 5753, which is at about the same distance. So Arp 297 does consist of a quartet of physically interacting galaxies — just two completely separate pairs, instead of four directly interacting galaxies.
"Excerpt courtesy of Courtney Seligman"
cseligman.com/text/atlas/ngc57a.htm#5755
Image... Cherryvalley Observatory (I83). Telescope: 0.2-m SCT & SBIG STL-1301E CCD Camera @f7.6. Image Scale 2.17 arcsec/pixel, Field of View 46 x 37 arcmins.
Flat field and dark subtract calibration frames. Combined Stack of two images of 210 seconds each unfiltered and unbinned. CCD operating temperature: -42 degrees. Image acquisition and processing: CCD Soft v5, TheSky6 Professional and Mira Pro v7. December 27th 2014.
Dr. Halton Arp originally compiled the Atlas of peculiar galaxies with photographs he made mainly using the Palomar 200-inch telescope and the 48-inch Schmidt telescope between the years 1961 to 1966. Original image can be found here: ned.ipac.caltech.edu/level5/Arp/Figures/big_arp297.jpeg
Arp Peculiar Object Number 297 - Multiple Galaxies With Long Filaments
NGC 5755 (= PGC 52690)
(with NGC 5752, 5753 and 5754 = Arp 297)
Discovered (Apr 1, 1878) by Lawrence Parsons, 4th Lord Rosse
A 14th-magnitude spiral galaxy (type SBd?) in Boötes (RA 14 45 24.5, Dec +38 46 49)
Historical Identification:
Physical Information: Based on a recessional velocity of 9660 km/sec, NGC 5755 is about 450 million light years away. Given that and its apparent size of 1.3 by 1.0 arcmin, it is about 170 thousand light years across. Although in the same general direction as the interacting pair NGC 5754 and 5752, NGC 5755 has no connection to those galaxies, being over twice as far away. Despite that, it is considered a part of galaxy quartet Arp 297, as Arp's catalog was based only on the visual appearance of galaxies and groups of galaxies, and not whether they were actually physically related to each other. However, as indicated by its distorted shape, NGC 5755 probably is interacting with NGC 5753, which is at about the same distance. So Arp 297 does consist of a quartet of physically interacting galaxies — just two completely separate pairs, instead of four directly interacting galaxies.
"Excerpt courtesy of Courtney Seligman"
cseligman.com/text/atlas/ngc57a.htm#5755
Image... Cherryvalley Observatory (I83). Telescope: 0.2-m SCT & SBIG STL-1301E CCD Camera @f7.6. Image Scale 2.17 arcsec/pixel, Field of View 46 x 37 arcmins.
Flat field and dark subtract calibration frames. Combined Stack of two images of 210 seconds each unfiltered and unbinned. CCD operating temperature: -42 degrees. Image acquisition and processing: CCD Soft v5, TheSky6 Professional and Mira Pro v7. December 27th 2014.
Dr. Halton Arp originally compiled the Atlas of peculiar galaxies with photographs he made mainly using the Palomar 200-inch telescope and the 48-inch Schmidt telescope between the years 1961 to 1966. Original image can be found here: ned.ipac.caltech.edu/level5/Arp/Figures/big_arp297.jpeg