M. Perez

Universidad Nacional Autónoma de México, Ciudad de México, The Federal District, Mexico

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Publications (3)6.73 Total impact

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    ABSTRACT: Recent detections of Fanaroff-Riley Class I AGNs by HESS, MAGIC, and VERITAS suggest that very-high-energy gamma-rays (VHE, E > 100 GeV) may not have a leptonic origin. We present a hadronic model to describe the TeV photons as the neutral pion decay resulting from pgamma and pp interactions. For the pgamma interaction, we assume that the target photons are produced by leptonic processes and apparent at the second spectral peak. For the pp interaction we consider as targets the thermal particle densities in the lobes. We show that this model can describe the TeV spectra of the radio galaxies NCG 1275, M87 and Cen A
    12/2012;
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    ABSTRACT: The Pierre Auger Observatory has associated a few ultra high energy cosmic rays with the direction of Centaurus A. This source has been deeply studied in radio, infrared, X-ray and $\gamma$-rays (MeV-TeV) because it is the nearest radio-loud active galactic nuclei. Its spectral energy distribution or spectrum shows two main peaks, the low energy peak, at an energy of $10^{-2}$ eV, and the high energy peak, at about 150 keV. There is also a faint very high energy (E $\geq$ 100 GeV) $\gamma$-ray emission fully detected by the High Energy Stereoscopic System experiment. In this work we describe the entire spectrum, the two main peaks with a Synchrotron/Self-Synchrotron Compton model and, the Very High Energy emission with a hadronic model. We consider p$\gamma$ and $pp$ interactions. For the p$\gamma$ interaction, we assume that the target photons are those produced at 150 keV in the leptonic processes. On the other hand, for the pp interaction we consider as targets the thermal particle densities in the lobes. Requiring a satisfactory description of the spectra at very high energies with p$\gamma$ interaction we obtain an excessive luminosity in ultra high energy cosmic rays (even exceeding the Eddington luminosity). However, when considering pp interaction to describe the $\gamma$-spectrum, the obtained number of ultra high energy cosmic rays are in agreement with Pierre Auger observations. Moreover, we calculate the possible neutrino signal from pp interactions on a Km$^3 $ neutrino telescope using Monte Carlo simulations.
    The Astrophysical Journal 04/2012; 753(1). · 6.73 Impact Factor
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    ABSTRACT: Centaurus A has been one of the best studied radio galaxies, observed in radio, infrared, X-ray and gamma-ray. Cen A has been associated with two cosmic ray events with energies about 57 EeV by the Pierre Auger Observatory. By assuming the first peak in the continuous spectra comes from electron synchrotron emission and that the second peak comes from self-synchrotron Compton (SSC), we show that pp interaction could be responsible for the TeV emission and that the obtained cosmic ray rate is in agreement with Pierre Auger Observations.
    09/2011;

Publication Stats

3 Citations
6.73 Total Impact Points

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Institutions

  • 2012
    • Universidad Nacional Autónoma de México
      • Institute of Astronomy
      Ciudad de México, The Federal District, Mexico