PKS 2155-304 | |
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![]() 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]
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