Abstract
We present the neutrino and UHECR spectra obtained from a detailed fitting of the spectral energy distribution (SED) of Mrk 421 (March 2001) using two variations of the leptohadronic model. In particular, while the low-energy component (optical to X-rays) of the SED is fitted by synchrotron emission of primary electrons in both models, the high-energy one (GeV-TeV gamma-rays) is synchrotron emission attributed either to ultra-high energy protons (LHs model) or to secondary electrons produced by the decay of charged pions (LHπ model). In the LHπ case we find that the produced neutrino spectra are sharply peaked at Eν ~ 30 PeV with a peak flux slightly below the IC-40 sensitivity limit for Mrk 421. In the LHs model, on the other hand, the neutrino spectra fall well outside the PeV energy range, but the calculated E ~ 30 EeV — UHECR flux at earth is close to that observed by HiresI, Telescope Array and Pierre Augere experiments.
Highlights
We present the neutrino and UHECR spectra obtained from a detailed fitting of the spectral energy distribution (SED) of Mrk 421 (March 2001) using two variations of the leptohadronic model
While the low-energy component of the SED is fitted by synchrotron emission of primary electrons in both models, the high-energy one (GeV-TeV gamma-rays) is synchrotron emission attributed either to ultra-high energy protons (LHs model) or to secondary electrons produced by the decay of charged pions (LHπ model)
In the LHπ case we find that the produced neutrino spectra are sharply peaked at Eν ∼ 30 PeV with a peak flux slightly below the IC-40 sensitivity limit for Mrk 421
Summary
The emission region is modelled as a sphere of radius R containing a tangled magnetic field B that moves with respect to an observer at Earth with a Doppler factor δ. During the SED modelling of Mrk 421 we did not attempt a best χ2− fit but instead we followed the approach of Ref. 5, which allows us to use a narrow range of parameter values. Within this range, we found, interestingly enough, two sets of very different proton injection parameters which give good fits to the data (see Table 1). We found, interestingly enough, two sets of very different proton injection parameters which give good fits to the data (see Table 1) In both cases, optical and X-rays are fitted by the primary injected leptonic component, while the origin of the GeV-TeV emission is different between the two models. The high-energy emission in the LHπ model is attributed to synchrotron radiation of secondary e+e− pairs, while in the LHs model it results from proton synchrotron radiation
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