PKS 2005-489 : a very bright BL Lac object in a nearby galaxy.
Abstract
The galaxy identified with the flat-spectrum radio source PKS 2005-489 has a bright and variable stellar nucleus with a brightest observed V magnitude of ≡13. The authors report radio, optical, UV and X-ray observations which indicate variability and power-law continua in each of these wavebands, leading to the conclusion that PKS 2005-489 is one of the brightest BL Lac objects known. The ultraviolet data show unusually strong absorption lines formed in the interstellar medium of our Galaxy, but no obvious features due to the host galaxy. The X-ray output in the range 0.04 - 6 keV is far in excess of a simple power-law extrapolation from lower frequencies.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- March 1986
- DOI:
- 10.1093/mnras/219.1.23P
- Bibcode:
- 1986MNRAS.219P..23W
- Keywords:
-
- Astronomical Spectroscopy;
- Bl Lacertae Objects;
- Radio Sources (Astronomy);
- Ultraviolet Spectra;
- Visible Spectrum;
- X Ray Spectra;
- Astrophysics