Astronomy:Arp 7

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Arp 7
Arp 7 by PanSTARRS
Observation data (J2000 epoch)
ConstellationHydra[1]
Right ascension 8h 50m 30.0s[2]
Declination−16° 37′ 00″[2]
Redshift0.018620±0.000002[3]
Helio radial velocity5,582±1 km/s[3]
Galactocentric velocity5,384±8 km/s[4][3]
Distance103.9 ± 146.4 Mly (31.853 ± 44.901 Mpc)[3]
Apparent magnitude (V)14.5[3]
Characteristics
TypeSB(rs)bc: HII[3]
Size40,737 ly
(12.49 kpc)
(diameter; 25.0 B-mag arcsec−2)[3][lower-alpha 1]
28,767 ly × 26,451 ly
(8.82 kpc × 8.11 kpc)
(diameter; "total" magnitude)[3][lower-alpha 1]
Apparent size (V)1.3′ × 1.0′ [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 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. ↑ 1.0 1.1 Seligman, Courtney. "Celestial Atlas: PCG Objects 24500–4999". http://cseligman.com/text/atlas/pgc24a.htm. 
  2. ↑ 2.0 2.1 2.2 Results for ARP 007. SIMBAD Astronomical Database. http://simbad.u-strasbg.fr/simbad/. Retrieved 2015-11-25. 
  3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 "Detailed Information for Object Arp 7". NASA/IPAC Extragalactic Database. https://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=Arp%207&extend=no&hconst=67.74&omegam=0.3089&omegav=0.6911&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES. 
  4. ↑ . Bibcode: 1991RC3.9.C...0000d. 
  5. ↑ Arp, Halton (1966). "Atlas of Peculiar Galaxies". Figure 1. https://ned.ipac.caltech.edu/level5/Arp/Arp_figure1.html. 

Notes

  1. ↑ 1.0 1.1 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.



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