VLBI imaging and optical variability of the BL Lac object OQ 530 (B1418+546)

Details VLBI imaging and optical variability of the BL Lac object OQ 530 (B1418+546) VLBI imaging and optical variability of the BL Lac object OQ 530 (B1418+546)

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...423..935m&link_type=abstract

Astronomy and Astrophysics, v.423, p.935-942 (2004)

Astronomy and Astrophysics

Astrophysics

9

Galaxies: Active, Galaxies: Bl Lacertae Objects: Individual: Oq 530, Galaxies: Jets

Scientific paper

Results of VLBI and optical observations are presented for the BL Lac object OQ 530 (B1418+546), whose long term optical variability is characterised by a decreasing mean luminosity trend. EVN images at 1.6 GHz and 5 GHz of OQ 530 show a very bright core with a much weaker jet extending to about 35-40 mas. The radio flux density from the core in June 2001 was much higher than that measured in February 1999. A similar increase was also found from nearly simultaneous optical photometry, while the total flux density of the jet remained unchanged. The structure of the jet shows several knots which move outward with an apparent superluminal motion with a βapp≥3.5h-1. The region within about 3 mas from the core contains a component not well resolved in our images and emerging from it in the jet direction. That component was also detected in images taken from 1990 to 1997 and it seems to be a rather stable structural feature. Using nearly simultaneous optical and radio data, we can describe the SED of the synchrotron peak with a simple formula, approximating a power law at low frequencies and a log-parabola at the high ones, whose maximum lies in the range 3.5-5×1013 Hz, and the extrapolation in the X-ray range gives a flux comparable to that observed with BeppoSAX.
Table A.1 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http :/ / cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/423/935

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