Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.266..669c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 266, p. 669
Astronomy and Astrophysics
Astronomy
10
Nonthermal Radiation, Extragalactic Radio Sources, Bl Lacertae Objects, Optical Emission Spectroscopy, X Ray Sources, Ultraviolet Spectra, Early Stars, Synchrotron Radiation, Elliptical Galaxies, Stellar Spectra, Radio Jets (Astronomy)
Scientific paper
We report observations of PKS 2316 - 423 in the ultraviolet and with the ROSAT HRI, where it appears as a bright point source. Optical spectroscopy reveals weak emission lines and a strong, excess blue continuum that is centrally concentrated. The combined optical-ultraviolet continuum spectrum cannot be fitted by any simple combination of a main-sequence stellar spectrum and a late-type elliptical galaxy spectrum, even allowing for intrinsic reddening. A nonthermal power-law spectrum reddened by less than 0.5 mag fits the optical-ultraviolet spectrum very well and extrapolates to match both the radio and X-ray fluxes. We suggest that this continuum emission is probably due to a nonthermal source, such as an active nucleus with an optical synchrotron jet. A second weak X-ray source 10 arcsec south of the nucleus may be related to the central source. PKS 2316 - 423 is probably a BL Lac object, orientated at an intermediate angle to our line of sight.
Crawford Carolin S.
Fabian Andrea C.
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