Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.219p..23w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 219, March 1, 1986, p. 23P-29P.
Astronomy and Astrophysics
Astronomy
30
Astronomical Spectroscopy, Bl Lacertae Objects, Radio Sources (Astronomy), Ultraviolet Spectra, Visible Spectrum, X Ray Spectra
Scientific paper
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.
Danziger Ivan John
Pettini Marco
Wall Jasper V.
Wamsteker Willelm
Warwick Robert S.
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