High energy emission processes in OJ 287 during 2009 flare
نویسندگان
چکیده
منابع مشابه
Suzaku 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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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 کاملOJ 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 کاملNonthermal Flare Emission from MeV - energy
We present analyses of two solar ares observed with high spatial resolution at 86 GHz with the BIMA millimeter{wavelength telescope and at 17 and 34 GHz with the Nobeyama radioheliograph. The ares were observed on Nov. 24, 1998 and May 1, 1999. At millimeter wavelengths these are impulsive events and therefore they must be produced by MeV energy electrons. The present study using simultaneous o...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2013
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stt904