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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Acceso en línea: | https://arxiv.org/abs/2507.11104 |
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| _version_ | 1866913942619553792 |
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| author | Ruina, Arshia Luciani, Helena Prandini, Elisa |
| author_facet | Ruina, Arshia Luciani, Helena Prandini, Elisa |
| contents | PG 1553+113 is a high-frequency peaked BL Lac object (HBL), with redshift 0.433, detected with the current generation of IACTs (Imaging Atmospheric Cherenkov Telescopes) up to $\sim$ 1 TeV. Interestingly, the continuous $γ$-ray lightcurve collected by Fermi-LAT since 2008 showed a signature of a periodic modulation of $2.18 \pm 0.08$ years at energies above 100 MeV and 1 GeV. In addition, the source shows clear variabiliy down to day-scale in all bands. XMM-Newton data recently showed rapid variability in the X-ray band down to $2.4 \pm 0.7$ ks.
Short-timescale (sub-hour) variabilities are a key observable to constrain the size of the photon-emitting region inside the blazar jet. The LST-1 (first protoype of the Large-Sized Telescope) of the CTAO (Cherenkov Telescope Array Observatory) is located on Roque de los Muchachos in La Palma, Spain. With its high sensitivity at low energies (20-150 GeV), it provides a unique opportunity to investigate such phenomena. In 2023, the source had a very bright flare that triggered LST-1 and multi-wavelength data campaigns. In this study, we present the results of this observation campaign, in particular, the search for short-timescale variabilities. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_11104 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Search for Short Timescale Variability in PG1553+113 with LST-1 of CTAO Ruina, Arshia Luciani, Helena Prandini, Elisa High Energy Astrophysical Phenomena PG 1553+113 is a high-frequency peaked BL Lac object (HBL), with redshift 0.433, detected with the current generation of IACTs (Imaging Atmospheric Cherenkov Telescopes) up to $\sim$ 1 TeV. Interestingly, the continuous $γ$-ray lightcurve collected by Fermi-LAT since 2008 showed a signature of a periodic modulation of $2.18 \pm 0.08$ years at energies above 100 MeV and 1 GeV. In addition, the source shows clear variabiliy down to day-scale in all bands. XMM-Newton data recently showed rapid variability in the X-ray band down to $2.4 \pm 0.7$ ks. Short-timescale (sub-hour) variabilities are a key observable to constrain the size of the photon-emitting region inside the blazar jet. The LST-1 (first protoype of the Large-Sized Telescope) of the CTAO (Cherenkov Telescope Array Observatory) is located on Roque de los Muchachos in La Palma, Spain. With its high sensitivity at low energies (20-150 GeV), it provides a unique opportunity to investigate such phenomena. In 2023, the source had a very bright flare that triggered LST-1 and multi-wavelength data campaigns. In this study, we present the results of this observation campaign, in particular, the search for short-timescale variabilities. |
| title | Search for Short Timescale Variability in PG1553+113 with LST-1 of CTAO |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2507.11104 |