The submilliarcsecond radio structures of the two BL Lac objects Mkn421 and 0735 + 178

Details The submilliarcsecond radio structures of the two BL Lac objects Mkn421 and 0735 + 178 The submilliarcsecond radio structures of the two BL Lac objects Mkn421 and 0735 + 178

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248..566z&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Feb. 1, 1991, p. 566-571. Onsala Space Observatory

Astronomy and Astrophysics

Astronomy

20

Bl Lacertae Objects, Elliptical Galaxies, Galactic Nuclei, Radio Sources (Astronomy), Very Long Base Interferometry, Astronomical Maps, Galactic Structure, Radio Astronomy, Relativistic Particles

Scientific paper

Very high-resolution (about 0.15 mas) VLBI hybrid maps of the two BL Lac objects Mkn421 and 0735 + 178 have been produced at 1.35-cm wavelength. The structures of both sources are simple. Only an unresolved core is found in Mkn421. It is magnetic field dominated, and the motion of relativistic electrons is strongly restrained by the magnetic field. Relativistic electrons with relatively low energy are responsible for the synchrotron radiation. The maps of 0735 + 178 show that the radio structure at 1.35 cm is dominated by a strong core, and there is a weak component outside. A lower limit can be put to the angular velocity of the outer component of (0.32 + or - 0.03) mas/yr, corresponding to an apparent transverse speed of (5.4 + or - 0.6) c which tallies with previous results. The outer component has an extension toward the south-east, a tendency also seen in the 6-cm VLBI maps.

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