Astronomy:PKS 2155-304
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Short description: Galaxy in the constellation Piscis Austrinus
| PKS 2155-304 | |
|---|---|
 Image of PKS 2155-304 obtained in R band at ESO-NTT | |
| Observation data (Epoch J2000) | |
| Constellation | Piscis Austrinus |
| Right ascension | 21h 58m 52.0651817803s |
| Declination | −30° 13′ 32.120657891″ |
| Redshift | 0.116 |
| Distance | 1.5 Gly |
| Type | BL Lac |
| Apparent magnitude (V) | 13.09 |
| Other designations | |
| QSO B2155-304, | |
| See also: Quasar,List of quasars]] | |
PKS 2155-304 is a BL Lac object, a galaxy hosting a type of blazar. It is a strong emitter from radio to high-energy frequencies.
PKS 2155-304 is at redshift z = 0.116 (Falomo, Pesce & Treves 1993)[full citation needed]. It is one of the brightest and most studied BL Lacs, one of the first identified through X-ray observations.[1]
References
- ↑ Aharonian, F. et al. (2007). "An Exceptional Very High Energy Gamma-Ray Flare of PKS 2155-304". The Astrophysical Journal 664 (2): L71–L78. doi:10.1086/520635. Bibcode: 2007ApJ...664L..71A.
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