NGC 7319

NGC 7319 is a highly distorted barred spiral galaxy that is a member of the compact Stephan's Quintet[5] group located in the constellation Pegasus, some 311 megalight-years distant from the Milky Way.[1] The galaxy's arms, dust and gas have been highly disturbed as a result of the interaction with the other members of the Quintet. Nearly all of the neutral hydrogen has been stripped from this galaxy, most likely as a result of a collision with NGC 7320c some 100 million years ago.[6] A pair of long, parallel tidal tails extend southward from NGC 7319 in the direction of NGC 7320c, and is undergoing star formation.[7]

NGC 7319
NGC 7319 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationPegasus
Right ascension22h 36m 03.56s[1]
Declination+33° 58′ 32.7″[1]
Redshift0.022[1]
Helio radial velocity6,740 km/s[2]
Distance311 Mly (95.3 Mpc)[1]
Apparent magnitude (V)14.1[3]
Characteristics
TypeSB(s)bc pec[3]
Apparent size (V)1′.7 × 1′.3[3]
Other designations
NGC 7319, UGC 12102, LEDA 69269, PGC 69269[4][3]

This is a type 2 Seyfert galaxy[1] with one of the largest circumnuclear outflows known in galaxies of this type. This outflow reaches velocities of up to 500 km/s and spans 13 kly. The star formation rate appears normal for a spiral galaxy at 1.98±0.58 M☉ yr−1, and the majority (68%) is occurring in the spiral arms.[7] The core appears faint in the ultraviolet band, indicating heavy extinction within the active galactic nucleus.[7] There is a three component radio source with an overall size of 5.5 kly that is straddling the nucleus.[8] A strong X-ray source with a high redshift has been detected at a separation of 8″ from the galactic nucleus. This quasi-stellar object is most likely being ejected from the host galaxy.[2]

References
  1. Koss, Michael; et al. (October 2011). "Host Galaxy Properties of the Swift Bat Ultra Hard X-Ray Selected Active Galactic Nucleus". The Astrophysical Journal. 739 (2): 20. arXiv:1107.1237. Bibcode:2011ApJ...739...57K. doi:10.1088/0004-637X/739/2/57. S2CID 118119154. 57.
  2. Galianni, Pasquale; et al. (February 2005). "The Discovery of a High-Redshift X-Ray-Emitting QSO Very Close to the Nucleus of NGC 7319". The Astrophysical Journal. 620 (1): 88–94. arXiv:astro-ph/0409215. Bibcode:2005ApJ...620...88G. doi:10.1086/426886. S2CID 757970.
  3. "NASA/IPAC Extragalactic Database". Results for NGC 7319. Retrieved 2007-04-21.
  4. "NGC 7319". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-10-08.
  5. Di Mille, F.; et al. (October 2008). Funes, José G.; J., S.; Corsini, Enrico Maria (eds.). 3D Spectroscopy of the Nuclear Environment of a Selected Sample of Nearby Active Galactic Nuclei: NGC 7319. Formation and Evolution of Galaxy Disks. Proceedings of the conference held 1-5 October, 2007 at the Centro Convegni Matteo Ricci, Rome, Italy. ASP Conference Series. 396. San Francisco: Astronomical Society of the Pacific. p. 61. Bibcode:2008ASPC..396...61D.
  6. Moles, M.; et al. (August 1997). "The Dynamical Status of Stephan's Quintet". The Astrophysical Journal. 485 (2): L69–L73. arXiv:astro-ph/9707194. Bibcode:1997ApJ...485L..69M. doi:10.1086/310817. S2CID 19033219.
  7. Xu, C. Kevin; et al. (January 2005). "Ultraviolet Emission and Star Formation in Stephan's Quintet". The Astrophysical Journal. 619 (1): L95–L98. arXiv:astro-ph/0411319. Bibcode:2005ApJ...619L..95X. doi:10.1086/425130. S2CID 119371650.
  8. Aoki, Kentaro; et al. (August 1999). "The Radio Emission of the Seyfert Galaxy NGC 7319". The Astrophysical Journal. 521 (2): 565–571. arXiv:astro-ph/9812365. Bibcode:1999ApJ...521..565A. doi:10.1086/307559. S2CID 8435704.

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