Suzaku Observation of the TeV Blazar 1ES 1218+304: Clues on Particle Acceleration in an Extreme TeV Blazar

Details Suzaku Observation of the TeV Blazar 1ES 1218+304: Clues on Particle Acceleration in an Extreme TeV Blazar Suzaku Observation of the TeV Blazar 1ES 1218+304: Clues on Particle Acceleration in an Extreme TeV Blazar

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...680l...9s&link_type=abstract

The Astrophysical Journal, Volume 680, Issue 1, pp. L9-L12.

Astronomy and Astrophysics

Astronomy

16

Bl Lacertae Objects: Individual (1Es 1218+304), Radiation Mechanisms: Nonthermal, X-Rays: Galaxies

Scientific paper

We observed the TeV blazar 1ES 1218+304 with the X-ray astronomy satellite Suzaku in 2006 May. At the beginning of the 2 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 multiwavelength data assuming a one-zone, homogeneous synchrotron self-Compton model, we obtain a magnetic field strength B~0.047 G and 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 the differential acceleration timescale of relativistic electrons provided that the gyrofactor ξ is 105.

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