NGC 5135
Galaxy in the constellation Hydra
From Wikipedia, the free encyclopedia
NGC 5135 is a barred spiral galaxy located in the constellation Hydra. It is located at a distance of about 200 million light years from Earth. It was discovered by John Herschel on May 8, 1834.[2] It is a Seyfert galaxy.[1]
| NGC 5135 | |
|---|---|
NGC 5135 by legacy surveys | |
| Observation data (J2000 epoch) | |
| Constellation | Hydra |
| Right ascension | 13h 25m 44.1s[1] |
| Declination | −29° 50′ 01″[1] |
| Redshift | 0.013693 ± 0.000020 [1] |
| Heliocentric radial velocity | 4,105 ± 6 km/s[1] |
| Distance | 194 Mly[1] |
| Apparent magnitude (V) | 12.9 |
| Characteristics | |
| Type | SB(l)ab [1] |
| Apparent size (V) | 2.6′ × 1.8′[1] |
| Notable features | Seyfert galaxy |
| Other designations | |
| ESO 444-G032, MCG -05-32-013, PGC 46974[1] | |
Characteristics
NGC 5135 has well defined spiral arms and is considered a grand design spiral galaxy. There is star formation along the leading edges of the arms.[3] There are dust lanes along the bar that curve towards the centre of galaxy.[4] Spiral arms become less well structured in the central regions.[3]
NGC 5135 is a bright source in infrared light and with total infrared luminosity of 1011.16−1011.23 L☉ is considered a luminous infrared galaxy.[5][6] Also strong ultraviolet emission was detected in the central 2 arcseconds of the galaxy, with a dozen of prominent knots, indicative of a recent starburst.[7] The total star formation rate in the galaxy is estimated to be 15.61 ± 1.87 M☉ per year.[6] Knots of gas measuring 45–180 parsecs across are detected along the inner spiral arms in CO(6-5) imaging and some of them are associated with starburst regions.[8]
The nucleus of NGC 5135 has been found to be active and it has been categorised as a type II Seyfert galaxy.[9] The most accepted theory for the energy source of active galactic nuclei is the presence of an accretion disk around a supermassive black hole. The mass of the black hole in the centre of NGC 5135 is estimated to be 107.29 (19 million) M☉.[10]
The active nucleus is obscured in X-rays by Compton-thick material with a column density of 6.7+16.6
−2.8×1024/cm2.[11] An ionization cone has been detected in [Si vi] emission that extends for 600 parsec from the nucleus. To the ionization of the gas apart from the active nucleus also contribute supernova remnant shocks and young stars.[12]
One supernova has been observed in NGC 5135: SN 2023dpj (type II, mag. 17).[13]
Nearby galaxies
NGC 5135 belongs to a galaxy group known as LGG 351 or NGC 5135 group. Other members of the group include ESO 444- 12, NGC 5124, IC 4248, NGC 5150, NGC 5152, NGC 5153, IC 4275, NGC 5182, ESO 444- 47, ESO 444- 15, ESO 444- 21 and IC 4251,[14] along with NGC 5126. IC 4248, which lies 13.5 arcminutes from NGC 5135 and form a pair,[15] looks distorted and asymmetrical.[16]
