TY - JOUR
T1 - Suzaku observation of TeV blazar the 1ES 1218+304
T2 - 2008 Workshop on Blazar Variability Across the Electromagnetic Spectrum, BLAZARS 2008
AU - Sato, R.
AU - Kataoka, J.
AU - Takahashi, T.
AU - Madejski, G. M.
AU - Rügamer, S.
AU - Wagner, S. J.
PY - 2008
Y1 - 2008
N2 - We observed the TeV blazar 1ES 1218+304 with the X-ray astronomy satellite Suzaku in May 2006. At the beginning of the two-day continuous observation, we detected a large flare in which the 5 10 keV flux changed by a factor of 2 on a timescale of 5 104 s. During the flare, the increase in the hard X-ray flux clearly lagged behind that observed in the soft X-rays, with the maximum lag of 2.3 104 s observed between the 0.3 1 keV and 5 10 keV bands. Furthermore we discovered that the temporal profile of the flare clearly changes with energy, being more symmetric at higher energies. From the spectral fitting of multi-wavelength data assuming a one-zone, homogeneous synchrotron self-Compton model, we obtain a magnetic field strength B 0.047 G, an emission region size R = 3.0 1016 cm for an appropriate beaming with a Doppler factor of δ = 20. This value of B is in good agreement with an independent estimate through the model fit to the observed time lag ascribing the energy-dependent variability to differential acceleration timescale of relativistic electrons provided that the gyro-factor ξ is 105
AB - We observed the TeV blazar 1ES 1218+304 with the X-ray astronomy satellite Suzaku in May 2006. At the beginning of the two-day continuous observation, we detected a large flare in which the 5 10 keV flux changed by a factor of 2 on a timescale of 5 104 s. During the flare, the increase in the hard X-ray flux clearly lagged behind that observed in the soft X-rays, with the maximum lag of 2.3 104 s observed between the 0.3 1 keV and 5 10 keV bands. Furthermore we discovered that the temporal profile of the flare clearly changes with energy, being more symmetric at higher energies. From the spectral fitting of multi-wavelength data assuming a one-zone, homogeneous synchrotron self-Compton model, we obtain a magnetic field strength B 0.047 G, an emission region size R = 3.0 1016 cm for an appropriate beaming with a Doppler factor of δ = 20. This value of B is in good agreement with an independent estimate through the model fit to the observed time lag ascribing the energy-dependent variability to differential acceleration timescale of relativistic electrons provided that the gyro-factor ξ is 105
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M3 - Conference article
AN - SCOPUS:85055534900
VL - 63
JO - Proceedings of Science
JF - Proceedings of Science
SN - 1824-8039
M1 - 061
Y2 - 22 April 2008 through 25 April 2008
ER -