NGC 7319
Galaxy in the constellation Pegasus
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NGC 7319 is a highly distorted barred spiral galaxy that is a member of the compact Stephan's Quintet[8] group located in the constellation Pegasus, some 311 megalight-years distant from the Milky Way.[1] It was discovered on 27 September 1873 by French astronomer Édouard Stephan.[9]
| NGC 7319 | |
|---|---|
NGC 7319 imaged by the Hubble Space Telescope | |
| Observation data (J2000 epoch) | |
| Constellation | Pegasus |
| Right ascension | 22h 36m 03.56s[1] |
| Declination | +33° 58′ 32.7″[1] |
| Redshift | 0.022[1] |
| Heliocentric radial velocity | 6,740 km/s[2] |
| Distance | 311 Mly (95.3 Mpc)[1] |
| Apparent magnitude (V) | 14.1[3] |
| Apparent magnitude (B) | 14.1[4] |
| Absolute magnitude (V) | −21.1[4] |
| Absolute magnitude (B) | −20.8[4] |
| magnitude (J) | 12.1[4] |
| magnitude (H) | 10.4[5] |
| magnitude (K) | 10.1[5] |
| Characteristics | |
| Type | SB(s)bc pec[3] |
| Mass | ~1.1×1011 M☉[6] M☉ |
| Size | 25.09 kiloparsecs (81,800 light-years) (diameter; 25.0 mag/arcsec2 B-band isophote)[3] |
| Apparent size (V) | 1′.7 × 1′.3[3] |
| Other designations | |
| NGC 7319, UGC 12102, LEDA 69269, PGC 69269[7][3] | |
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.[10] A pair of long, parallel tidal tails extend southward from NGC 7319 in the direction of NGC 7320c, and is undergoing star formation.[11]
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.[11] The core appears faint in the ultraviolet band, indicating heavy extinction within the active galactic nucleus.[11] There is a three component radio source with an overall size of 5.5 kly that is straddling the nucleus.[12] A strong X-ray source with a high redshift has been detected at a separation of 8″ from the galactic nucleus, a quasi-stellar object.[2]
Supernova
One supernova has been observed in NGC 7319: SN 1971P (type unknown, mag. 16.8) was discovered by Leonida Rosino on 19 August 1971.[13][14]
