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Arp 7 (PGC 24836) is a spiral galaxy in the constellation Hydra.[1] Redshift-independent measurements of its distance vary widely, from 5.9 to 83.7 megaparsecs (19.24 to 273.0 million light-years).[3] Its morphological classification is SB(rs)bc,[3] meaning it is a barred spiral galaxy with some ring-like structure.

Arp 7 was imaged by Halton Arp and included in his Atlas of Peculiar Galaxies under the category of ‘split arm’ galaxies.[5] 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).

References

  1. ^ a b Seligman, Courtney. “Celestial Atlas: PCG Objects 24500–4999”. Retrieved 2015-11-25.
  2. ^ a b c Results for ARP 007. SIMBAD Astronomical Database. Retrieved 2015-11-25.
  3. ^ a b c d e f g h i j k l “Detailed Information for Object Arp 7”. NASA/IPAC Extragalactic Database. Retrieved August 3, 2025.
  4. ^ . Bibcode:1991RC3.9.C…0000d. {{cite journal}}: Cite journal requires |journal= (help); Missing or empty |title= (help)
  5. ^ Arp, Halton (1966). “Atlas of Peculiar Galaxies”. Figure 1. Retrieved 2015-11-25.

Notes

  1. ^ a b The quick-look major axis physical diameters given by NED of 12.49 kiloparsecs (40,700 light-years) and 8.82 by 8.11 kiloparsecs (28,800 by 26,500 light-years) were based on distance estimates of 31.853 ± 44.901 Mpc (103.9×10^6 ± 146.4×10^6 ly) using a scale of 154.4 parsec/arcsec multiplied with given angular diameters.