| NGC 7599 | |
|---|---|
 NGC 7599 (left) and NGC 7590 (right) imaged by Legacy Surveys | |
| Observation data (J2000epoch) | |
| Constellation | Grus |
| Right ascension | 23h 19m 31.055s[1] |
| Declination | −42° 15′ 25.24″[1] |
| Redshift | 0.005508 ± 0.000017[1] |
| Heliocentric radial velocity | 1,651 ± 5 km/s[1] |
| Distance | 62.7 ± 7.4Mly (19.2 ± 2.3Mpc)[1] |
| Apparent magnitude (V) | 11.5[2] |
| Characteristics | |
| Type | SB(s)c[1] |
| Size | ~94,000 ly (28.9 kpc) (estimated)[1] |
| Apparent size (V) | 4.4′ × 1.3′[1] |
| Other designations | |
| ESO 347- G 034,IRAS 23166-4231,IC 5308,MCG -07-47-033,PGC 71066[1] | |
NGC 7599 is abarred spiral galaxy in the constellationGrus. The galaxy lies about 65 millionlight years away from Earth based on redshift independent methods, which means, given its apparent dimensions, that NGC 7599 is approximately 95,000 light years across.[1] It was discovered byJames Dunlop on July 14, 1826. It was also discovered byLewis Swift on 8 August 1897 and thus listed as IC 5308.[3]
NGC 7599 has a very small and not very bright nucleus. The galaxy has multiplespiral arms with knots and branches. A dark lane is visible on one side of the galaxy.[4] The galaxy is a faint source of radiowaves, with the brightest region being west of the outer disk of the galaxy and is associated with the arm that emerges south of the nucleus.[5] The region is also visible in infrared, indicating the presence of dust, and slightly higher ultraviolet emission than its surrounding area. It is possible that this region underwent a star formation event as a result of the interaction between NGC 7599 and nearby galaxy NGC 7590.[6] In the centre of the galaxy lies asupermassive black hole, whose mass is estimated to be 106.48 ± 0.56 (0.8 - 11 millions)M☉, based on the pitch angle of the spiral arms.[7]
NGC 7599 forms a pair withNGC 7590, which lies 4.9 arcminutes away.[4] A hydrogen bridge has been detected between the two galaxies, indicating they areinteracting.[8] These two galaxies, along withNGC 7582 andNGC 7552 form the Grus Quartet.[9] In the samegalaxy group with the Grus Quarter lie the galaxiesNGC 7496,NGC 7531,NGC 7632, andIC 5325.[10] This group, along with the group centred aroundIC 1459 form the Grus cloud, a region of elevated galaxy density. The Grus cloud, along with the nearby Pavo-Indus cloud, lies between theLocal Supercluster andPavo–Indus Supercluster.[11]
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