Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..785a&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 93, April 1987, p. 785-787. NSERC-supported research.
Astronomy and Astrophysics
Astronomy
21
Astronomical Spectroscopy, Bl Lacertae Objects, Blazars, Quasars, Radio Emission, Radio Sources (Astronomy), Red Shift, Emission Spectra, Signal To Noise Ratios, Spectral Line Width
Scientific paper
The authors report the initial results of an attempt to detect weak features in the spectra of blazars lacking redshifts. They find a redshift of 0.392 for PKS 2208-137, and a redshift of 0.601 for MC3 2032+107; both objects have broad permitted lines. Using the new redshift, the authors calculate that the double radio lobes of PKS 2208-137 emit 2.7×1033erg/s Hz at 20 cm (for H0 = 75 km/s Mpc and q0 = 1/2), and the projected linear size is 59 kpc. The Hβ emission-line luminosity is ≡2×1043erg/s. These properties are consistent with the "unified scheme" assertion that the parent population for PKS 2208-137 is composed of normal double radio quasars. For MC3 2032+107 the redshift implies that the diffuse radio emission has power 3.1×1032erg/s Hz and projected size 27 kpc. The Hβ luminosity is ≡1043erg/s. The emission-line spectrum has a strong narrow component. This object may be a normal double radio quasar or radio galaxy seen from the jet direction. The projected linear sizes of both objects are consistent with substantial foreshortening.
Antonucci Robert R. J.
Hickson Paul
Miller Jeffrey S.
Olszewski Edward W.
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