Global 3- and 7-mm VLBI Observations of OJ 287
نویسندگان
چکیده
منابع مشابه
OJ 287 as a Rotating Helix
We present preliminary data from high-cadence 15-GHz VLBA images of OJ 287 from 1995 to 2015. The ridgelines suggest that the jet is rotating, perhaps with a period of ∼30 years. The EVPA of the core rotated by 240◦ in 2001–2002 and decreased slowly after that. The inner jet apparently moved to a new direction after the rotation, as shown by the emergence of a new component at a new PA at 43 GH...
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X-ray properties of the BL Lacertae object OJ 287, observed with ASCA on 1997 April 26 and November 17, are reported. The 0.5 – 10 keV flux was lower than those obtained in previous X-ray observations, and no evidence of intensity variations was found during each observation. The obtained flux densities at 1 keV, 0.22 ∼ 0.26 μJy, exceed the extrapolations from lower frequency synchrotron contin...
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We use a continuous wavelet transform to analyze more than two decades of data for the BL Lac object OJ 287 acquired as part of the UMRAO variability program. We find clear evidence for a persistent modulation of the total flux and polarization with period ∼ 1.66 years, and for another signal that dominates activity in the 1980s with period ∼ 1.12 years. The relationship between these two varia...
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متن کاملThe OJ 287 colors during a multiwavelength campaign
In 2005 the blazar OJ 287 exhibited an interesting variable behavior in the optical band. An optical outburst was observed in the period Oct.-Nov. 2005, and two XMM-Newton X-ray observations were performed in correspondence with two active optical states of the source (an intermediate flare and such claimed outburst). These satellite pointings triggered and invited observations by several radio...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of Japan
سال: 1996
ISSN: 0004-6264,2053-051X
DOI: 10.1093/pasj/48.1.37