| NGC 7236 | |
|---|---|
 NGC 7236 byPanSTARRS | |
| Observation data (J2000epoch) | |
| Constellation | Pegasus |
| Right ascension | 22h 14m 45.0s[1] |
| Declination | +13° 50′ 47″[1] |
| Redshift | 0.026186 ± 0.000005[1] |
| Heliocentric radial velocity | 7,850 ± 1km/s[1] |
| Distance | 290 ± 73Mly (89 ± 22.5Mpc)[1] |
| Apparent magnitude (V) | 13.6[2] |
| Characteristics | |
| Type | SA0^-[1] |
| Apparent size (V) | 1.25′ × 0.56′[1] |
| Notable features | Interacting galaxy, radio galaxy |
| Other designations | |
| UGC 11958,Arp 169, II Zw 172,CGCG 428-058,MCG +02-56-023,3C 442A,PGC 68384[1] | |
NGC 7236 is aninteractinglenticular galaxy located in the constellationPegasus. It is located at a distance of about 300 millionlight years from Earth, which, given its apparent dimensions, means that NGC 7236 is about 150,000 light years across.[1] NGC 7236 forms a pair withNGC 7237 and is aradio galaxy. It was discovered byAlbert Marth on August 25, 1864.[3]
NGC 7236 forms a pair withelliptical galaxy NGC 7237, which lies 35 arcseconds to the southeast. The two galaxies are undergoing amerger and are surrounded by hot gas (corona) with temperature of around 1keV. The total mass of that gas is estimated to be3×1010 M☉.[4] A smaller elliptical galaxy, NGC 7237C, lies 38 arcseconds southeast of NGC 7237. A faint tail emanates from NGC 7236.[5] It is included in theAtlas of Peculiar Galaxies, in the category diffuse counter-tails. A tail is also visible in X-rays.[6] A dust lane runs across the galaxy.[7]
The galaxy pair is a source of radiowaves. The radio emission has a double lobe structure, with filaments, but nojets, while a weak core is identified as the nucleus of NGC 7237.[8] The filaments could be created by the interaction of hot gas with the preexisting radio emitting plasma. Some bright radio sources are visible within the lobes but they could be backgroundactive galaxies.[6]
Onesupernova has been observed in NGC 7236: SN 2019krv (type Ia, mag. 18.4).[9]
