Table of Contents Categories
  • Arp objects
  • Principal Galaxies Catalogue objects
  • Peculiar galaxies
  • Hydra (constellation)
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    Arp 7

    Topic: Astronomy

     From Handwiki - Reading time: 2 min
    Short description: Spiral Galaxy in the constellation of Hydra
    ARP 7
    Arp 7 PanSTARRS1 i.r.g.jpg
    Arp 7 by PanSTARRS
    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]

    Coordinates: Sky map 08h 50m 30s, −16° 37′ 00″ 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 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

    References

    1. ↑ 1.0 1.1 Seligman, Courtney. "Celestial Atlas: PCG Objects 24500 - 24999". http://cseligman.com/text/atlas/pgc24a.htm. 
    2. ↑ 2.0 2.1 2.2 SIMBAD Astronomical Database. http://simbad.u-strasbg.fr/simbad/. Retrieved 2015-11-25. 
    3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 "NASA/IPAC Extragalactic Database". Results for ARP 007. http://www.ned.ipac.caltech.edu/. 
    4. ↑ Arp, Halton (1966). "Atlas of Peculiar Galaxies". Figure 1. https://ned.ipac.caltech.edu/level5/Arp/Arp_figure1.html. 

    Notes

    1. ↑ Calculated from apparent size and distance:[math]\displaystyle{ 5.9-83.7 Mpc*sin(57.1 arcsec) = 5,300 - 75,000 ly }[/math]

    External links




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