Arp 7

Arp 7 (PGC 24836) is a spiral galaxy in the constellation Hydra.[1] Redshift-independent measurements of its distance vary widely, from 5.9 Mpc to 83.7 Mpc.[3] Its morphological classification is SB(rs)bc,[3] meaning it is a barred spiral galaxy with some ring-like structure.

ARP 7
An image of Arp 7 from Halton Arp's Atlas of Peculiar Galaxies.
Observation data (J2000 epoch)
ConstellationHydra [1]
Right ascension 8h 50m 30.0s[2]
Declination−16° 37′ 00″[2]
Redshift0.018356 ± 0.000027 (5503 ± 8 km/s)[3]
Distance19–273 Mly (5.9–83.7 Mpc)[3]
Apparent magnitude (V)12.40[3]
Characteristics
TypeSB(rs)bc [3]
Size5,200 ly (1.6 kpc) (75,000 ly (23 kpc)?) (estimated)[lower-alpha 1][3]
Apparent size (V)57.1″ × 52.53″ [3]
Other designations
PGC 024836,[3] APG 7[2]

Arp 7 was imaged by Halton Arp and included in his Atlas of Peculiar Galaxies under the category of 'split arm' galaxies.[4] Five other galaxies are also included in this section of the atlas: Arp 8 (NGC 497), Arp 9 (NGC 2523), Arp 10 (UGC 1775), Arp 11 (UGC 717), and Arp 12 (NGC 2608).

See also
  • List of largest galaxies

References
  1. Seligman, Courtney. "Celestial Atlas: PCG Objects 24500 - 24999". Retrieved 2015-11-25.
  2. SIMBAD Astronomical Database. Results for ARP 007. Retrieved 2015-11-25.
  3. "NASA/IPAC Extragalactic Database". Results for ARP 007. Archived from the original on 1997-12-22. Retrieved 2015-11-25.
  4. Arp, Halton (1966). "Atlas of Peculiar Galaxies". Figure 1. Retrieved 2015-11-25.

Notes
  1. Calculated from apparent size and distance:


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