The sub-milliarcsecond radio structure of AO 0235 + 164

Details The sub-milliarcsecond radio structure of AO 0235 + 164 The sub-milliarcsecond radio structure of AO 0235 + 164

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284...60j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 1, 1984, p. 60-64.

Other

36

Bl Lacertae Objects, Centimeter Waves, Extragalactic Radio Sources, Very Long Base Interferometry, Absorption Spectra, Astronomical Maps, Hydrogen, Spiral Galaxies

Scientific paper

Very high resolution (less than 0.2 milli-arcsec) VLBI hybrid maps of the BL Lacertae object AO 0235 + 164 have been produced at a wavelength of 1.3 cm. These maps show the object's radio structure to be dominated by a strong, nearly unresolved core. The small angular size of this core, combined with previous X-ray observations, implies that bulk relativistic motion is occurring in the core. In addition, a weak component is detected 0.7 milli-arcsec from the core in position angle + 7 deg. This position angle is similar to that of the weak extensions seen by other investigators at lower frequencies, although there appears to be a tendency for the position angles to be larger at lower frequencies. The possible relation between the structure seen in the hybrid maps and the variable H I absorption seen at 932 MHz is discussed.

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