Other
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.1908k&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #19.08; Bulletin of the American Astronomical Society, Vol. 26, p.1342
Other
Scientific paper
Optically Quiet Quasars (OQQs), also known as Red Quasars, are compact radio-loud and X-ray bright active galactic nuclei with very weak optical continuum emission. Several explanations have been proposed for the inverted spectral energy distribution of OQQs (SEDs with C equiv alpha_ {ro} / alpha_ {ox} > 1), in particular excess reddening and soft X-ray absorption over that expected from the Galaxy. We have made multifrequency observations of three previously known OQQs: 0026+346 a GHz-peaked galaxy at z=0.6, 0406+121 a BL Lac object at z=1.02, and 0500+019 a GHz-peaked radio source with an unknown redshift. ROSAT PSPC spectra are consistent with excess absorption, although we cannot rule out a purely galactic N_H if the X-ray spectra are very hard. New optical observations of 0406+121 and 0500+019 confirm the steep optical continuum. The wide range of radio and optical properties of OQQs suggests that, if excess absorption is important, it arises from a physically unrelated system that intercepts the line of sight. Gravitational microlensing from an intervening system may also explain some of the extreme properties in 0406+121 and other ``red blazars''. We also observed 10 OQQ candidates selected from two correlations of the ROSAT all-sky survey (RASS) with radio surveys. A few AGNs with C ~ 1, but no clear examples of true OQQs, indicating that inverted SEDs are rare.
Brinkmann Wolfgang
Dey Arjun
Feigelson Eric D.
Kollgaard Ron I.
Laurent-Muehleisen Sally A.
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