Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999acaps..19..145c&link_type=abstract
Acta Astrophys. Sin., Vol. 19, No. 2, p. 145 - 150
Astronomy and Astrophysics
Astrophysics
Bl Lacertae Objects: Jets, Bl Lacertae Objects: Vlb Interferometry
Scientific paper
A new high resolution (≡2 milli-arcsec) VLBI hybrid map at a wavelength of 6 cm of the BL Lacertae object AO 0235+164 has been produced. The map shows that the object's radio structure is dominated by a strong, nearly unresolved core, with two weaker components one in the NE, one in the SW, the former much clearer than the latter. The position angle of the jet component is 66.4°, larger than in previous observations. From the time variation of the flux density, the authors find that there are probably two periodic variations, a shorter periodic variation of 1 - 2 yr and a longer one of 3 - 5 yr. These two periodicities could be due to joint action of jet outbursts and jet rotation.
Chen Yongjun
Zhang Fujun
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