Abstract
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 5×10 4 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 ×10 4 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 × 10 16 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 10 5.
| Original language | English |
|---|---|
| Title of host publication | AIP Conference Proceedings |
| Pages | 447-450 |
| Number of pages | 4 |
| Volume | 1085 |
| DOIs | |
| Publication status | Published - 2009 |
| Externally published | Yes |
| Event | 4th International Meeting on High Energy Gamma-Ray Astronomy - Heidelberg, Germany Duration: 2008 Jul 7 → 2008 Jul 11 |
Other
| Other | 4th International Meeting on High Energy Gamma-Ray Astronomy |
|---|---|
| Country | Germany |
| City | Heidelberg |
| Period | 08/7/7 → 08/7/11 |
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Keywords
- BL lacertae objects
- Individual (1ES 1218+304)
ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Suzaku observation of TeV blazar the 1ES 1218+304 : Clues on particle acceleration in an extreme TeV blazar. / Sato, R.; Kataoka, Jun; Takahashi, T.; Medejski, G. M.; Rügamer, S.; Wagner, S. J.
AIP Conference Proceedings. Vol. 1085 2009. p. 447-450.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Suzaku observation of TeV blazar the 1ES 1218+304
T2 - Clues on particle acceleration in an extreme TeV blazar
AU - Sato, R.
AU - Kataoka, Jun
AU - Takahashi, T.
AU - Medejski, G. M.
AU - Rügamer, S.
AU - Wagner, S. J.
PY - 2009
Y1 - 2009
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 5×10 4 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 ×10 4 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 × 10 16 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 10 5.
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 5×10 4 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 ×10 4 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 × 10 16 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 10 5.
KW - BL lacertae objects
KW - Individual (1ES 1218+304)
UR - http://www.scopus.com/inward/record.url?scp=63849127033&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=63849127033&partnerID=8YFLogxK
U2 - 10.1063/1.3076704
DO - 10.1063/1.3076704
M3 - Conference contribution
AN - SCOPUS:63849127033
VL - 1085
SP - 447
EP - 450
BT - AIP Conference Proceedings
ER -