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...
متن کاملExtraordinary Activity in the BL Lac Object OJ 287
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...
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...
متن کاملObservations of the BL Lacertae Object OJ 287 in 1997 April and November
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...
متن کاملSuzaku observation of OJ 287 ; Quiescence and predicted flare in 2007
Suzaku observations are reported of the BL Lacertae object OJ 287, performed on 2007 April 10– 13 during the optical quiescent phase and on 2007 November 7–9 during the optical flaring phase. We organized the simultaneous the radio and optical observations with the Nobeyama Millimeter Array and optical KANATA telescope at Hiroshima University, respectively. The X-ray spectrum obtained in the qu...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2013
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/764/1/5