| PKS 2155-304 | |
|---|---|
 Image of PKS 2155-304 obtained in R band at ESO-NTT | |
| Observation data (Epoch J2000) | |
| Constellation | Piscis Austrinus |
| Right ascension | 21 58 52.0651817803 |
| 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). It is one of the brightest and most studied BL Lacs, one of the first identified through X-ray observations.
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. arXiv:0706.0797. Bibcode:2007ApJ...664L..71A. doi:10.1086/520635. S2CID 119319369.
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