Temporary EHBL-like behavior of Markarian 501 during July 2014 VHE flaring
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2025
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| author | Sahu, Sarira Oliveros, A. U. Puga Páez-Sánchez, D. I. Sánchez-Colón, G. Rajpoot, Subhash Martínez, M. E. Iglesias Carmenate, José Guerra de Córdoba, P. Fernández Lambiase, Gaetano |
| author_facet | Sahu, Sarira Oliveros, A. U. Puga Páez-Sánchez, D. I. Sánchez-Colón, G. Rajpoot, Subhash Martínez, M. E. Iglesias Carmenate, José Guerra de Córdoba, P. Fernández Lambiase, Gaetano |
| contents | Markarian 501, a BL Lac object well-known as a high energy gamma-ray source, has exhibited several epochs of very high energy (VHE) gamma-ray flaring events when its synchrotron peak frequency shifted above $10^{17}$ Hz, a signature of extreme behavior. From July 16 to July 31, 2014 such flaring events were observed for 15 days by various telescopes. On July 19 (MJD 56857.98), the X-ray outburst from the source was at its highest and on the same day an intriguing narrow peak-like feature around 3 TeV was observed by the MAGIC telescopes, a feature inconsistent with standard interpretations. Using the well-known two-zone photohadronic model, we study these VHE gamma-ray spectra on a day-by-day basis and offer explanation. Our two-zone photohadronic scenario shows that, on MJD 56857.98, the peak-like feature appears at a cutoff energy of $E^c_γ=3.18$ TeV. Below this energy the VHE spectrum increases slowly and is in high emission state. However, for $E^c_γ\, > 3.18$ TeV, the spectrum falls faster, resulting in a mild peak-like feature, not prominent enough as claimed by the MAGIC collaboration. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_07940 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Temporary EHBL-like behavior of Markarian 501 during July 2014 VHE flaring Sahu, Sarira Oliveros, A. U. Puga Páez-Sánchez, D. I. Sánchez-Colón, G. Rajpoot, Subhash Martínez, M. E. Iglesias Carmenate, José Guerra de Córdoba, P. Fernández Lambiase, Gaetano High Energy Astrophysical Phenomena High Energy Physics - Phenomenology Markarian 501, a BL Lac object well-known as a high energy gamma-ray source, has exhibited several epochs of very high energy (VHE) gamma-ray flaring events when its synchrotron peak frequency shifted above $10^{17}$ Hz, a signature of extreme behavior. From July 16 to July 31, 2014 such flaring events were observed for 15 days by various telescopes. On July 19 (MJD 56857.98), the X-ray outburst from the source was at its highest and on the same day an intriguing narrow peak-like feature around 3 TeV was observed by the MAGIC telescopes, a feature inconsistent with standard interpretations. Using the well-known two-zone photohadronic model, we study these VHE gamma-ray spectra on a day-by-day basis and offer explanation. Our two-zone photohadronic scenario shows that, on MJD 56857.98, the peak-like feature appears at a cutoff energy of $E^c_γ=3.18$ TeV. Below this energy the VHE spectrum increases slowly and is in high emission state. However, for $E^c_γ\, > 3.18$ TeV, the spectrum falls faster, resulting in a mild peak-like feature, not prominent enough as claimed by the MAGIC collaboration. |
| title | Temporary EHBL-like behavior of Markarian 501 during July 2014 VHE flaring |
| topic | High Energy Astrophysical Phenomena High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2502.07940 |