Title:	Constraints on a proton synchrotron origin of VHE gamma rays from the extended jet of AP librae.
Authors:	Basumallick, Partha Pratim Gupta, Nayantara
Keywords:	BL Lacertae objects jets gamma rays galaxies
Issue Date:	Jul-2017
Publisher:	IOP Sciences for The American Astronomical Society
Citation:	The Astrophysical Journal, 2017, Vol.844, p58
Abstract:	The multiwavelength photon spectrum from the BL Lac object AP Librae extends from radio to TeV gamma rays. The X-ray to very high-energy gamma-ray emission from the extended jet of this source has been modeled with inverse Compton (IC) scattering of relativistic electrons off the cosmic microwave background (CMB) photons. The IC/CMB model requires the kpc-scale extended jet to be highly collimated with a bulk Lorentz factor close to 10. Here we discuss the possibility of a proton synchrotron origin of X-rays and gamma rays from the extended jet with a bulk Lorentz factor of 3. This scenario requires an extreme proton energy of 3.98 × 1021 eV and a high magnetic field of 1 mG of the extended jet with jet power ~5 × 1048 erg s−1 in particles and the magnetic field (which is more than 100 times the Eddington luminosity of AP Librae) to explain the very high-energy gamma-ray emission. Moreover, we have shown that X-ray emission from the extended jets of 3C 273 and PKS 0637-752 could be possible by proton synchrotron emission with jet power comparable to the Eddington luminosities.
Description:	Open Access
URI:	http://hdl.handle.net/2289/6752
ISSN:	0004-637X 1538-4357-(Online)
Alternative Location:	http://adsabs.harvard.edu/abs/2017ApJ...844...58P http://arxiv.org/abs/1706.04895 http://dx.doi.org/10.3847/1538-4357/aa7a12
Copyright:	2017, The American Astronomical Society.
Appears in Collections:	Research Papers (A&A)

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