1. Challenging the one zone SSC model in VHE gamma ray emitting BL lacs: The interesting case of PKS 1424+240.
- Author
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Prandini, E., Becerra-González, J., Lindfors, E., Mankuzhiyil, N., Stamerra, A., Tavecchio, F., MAGIC Collaboration, Cutini, S., Gasparrini, D., Hovatta, T., Lähteenmäki, A., and Lister, M.
- Subjects
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SUPERCONDUCTING Super Collider , *GAMMA rays , *IMAGING systems in astronomy , *TELESCOPES , *DOPPLER effect , *SYNCHROTRONS , *ASTRONOMICAL observations - Abstract
The BL Lac object PKS 1424+240 with uncertain redshift has been investigated by the MAGIC imaging atmospheric Cherenkov telescopes at very high energies (VHE; E> 100 GeV) since 2006. The source was observed in various emission states and the integral flux above 150 GeV shows hints of variability. We present a detailed analysis of the multi-frequency emission, from radio to VHE gamma rays. We show that a simple one-zone synchrotron self Compton (SSC) model is inadequate to account for the observed spectral behavior. In particular, the synchrotron peak is much broader than the high-energy peak and the separation between the two peaks is large, which requires high Doppler factor for modeling. We investigate the correlation between lightcurves in several wavebands and propose a two-zone SSC model to fit the experimental data where part of the observed emission is due to a parsec scale jet and the remaining part to a more compact region close to the central engine. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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