Galactic Center Observations with CTAO LST-1
Very-high-energy gamma-ray observations of the central part of the Milky Way Galaxy allow for morphological study of cosmic-ray propagation around the supermassive black hole Sgr A*. An interpretation of the diffuse gamma-ray component, which spans a few hundred parsecs in longitude, is the PeVatron...
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EDP Sciences
2025-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2025/04/epjconf_ricap2024_05006.pdf |
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| author | Abe Shotaro Abhishek Doro Michele Inada Tomohiro Strzys Marcel Teshima Masahiro Vovk Ievgen |
| author_facet | Abe Shotaro Abhishek Doro Michele Inada Tomohiro Strzys Marcel Teshima Masahiro Vovk Ievgen |
| author_sort | Abe Shotaro |
| collection | DOAJ |
| description | Very-high-energy gamma-ray observations of the central part of the Milky Way Galaxy allow for morphological study of cosmic-ray propagation around the supermassive black hole Sgr A*. An interpretation of the diffuse gamma-ray component, which spans a few hundred parsecs in longitude, is the PeVatron scenario: the spectral energy distribution follows a power law up to a few tens of TeV, with a spatial distribution that is aligned with the central molecular zone and accelerated cosmic rays that propagate in the vicinity of Sgr A*. Nevertheless, differences in the findings of earlier studies persist among current-generation telescopes, each offering different interpretations based on different analytical approaches. The MAGIC telescopes for example presented a hint of a presence of a spectral turnover at around 20 TeV, possibly in tension with the PeVatron scenario. We analyzed Galactic Center data taken by the Large-Sized Telescope prototype (LST-1) for the Cherenkov Telescope Array Observatory (CTAO), the next-generation project of a ground-based gammaray observatory currently under commissioning. Despite the limited sensitivity due to the current monoscopic observation, the relatively wide field of view and the large-zenith-angle observation technique allow LST-1 to study the diffuse emission in the TeV range. In this contribution, we will report the current status of studies of the Galactic Center diffuse emission by including our results from LST-1 observations. |
| format | Article |
| id | doaj-art-374b7790d08740de89eea1daee4d9b09 |
| institution | DOAJ |
| issn | 2100-014X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj-art-374b7790d08740de89eea1daee4d9b092025-08-20T03:07:01ZengEDP SciencesEPJ Web of Conferences2100-014X2025-01-013190500610.1051/epjconf/202531905006epjconf_ricap2024_05006Galactic Center Observations with CTAO LST-1Abe Shotaro0Abhishek1Doro Michele2Inada Tomohiro3Strzys Marcel4Teshima Masahiro5Vovk Ievgen6Institute for Cosmic Ray Research, The University of TokyoINFN and Università degli Studi di Siena, Dipartimento di Scienze Fisiche, della Terra e dell’Ambiente (DSFTA), Sezione di FisicaINFN Sezione di Padova and Università degli Studi di PadovaInstitute for Cosmic Ray Research, The University of TokyoInstitute for Cosmic Ray Research, The University of TokyoInstitute for Cosmic Ray Research, The University of TokyoInstitute for Cosmic Ray Research, The University of TokyoVery-high-energy gamma-ray observations of the central part of the Milky Way Galaxy allow for morphological study of cosmic-ray propagation around the supermassive black hole Sgr A*. An interpretation of the diffuse gamma-ray component, which spans a few hundred parsecs in longitude, is the PeVatron scenario: the spectral energy distribution follows a power law up to a few tens of TeV, with a spatial distribution that is aligned with the central molecular zone and accelerated cosmic rays that propagate in the vicinity of Sgr A*. Nevertheless, differences in the findings of earlier studies persist among current-generation telescopes, each offering different interpretations based on different analytical approaches. The MAGIC telescopes for example presented a hint of a presence of a spectral turnover at around 20 TeV, possibly in tension with the PeVatron scenario. We analyzed Galactic Center data taken by the Large-Sized Telescope prototype (LST-1) for the Cherenkov Telescope Array Observatory (CTAO), the next-generation project of a ground-based gammaray observatory currently under commissioning. Despite the limited sensitivity due to the current monoscopic observation, the relatively wide field of view and the large-zenith-angle observation technique allow LST-1 to study the diffuse emission in the TeV range. In this contribution, we will report the current status of studies of the Galactic Center diffuse emission by including our results from LST-1 observations.https://www.epj-conferences.org/articles/epjconf/pdf/2025/04/epjconf_ricap2024_05006.pdf |
| spellingShingle | Abe Shotaro Abhishek Doro Michele Inada Tomohiro Strzys Marcel Teshima Masahiro Vovk Ievgen Galactic Center Observations with CTAO LST-1 EPJ Web of Conferences |
| title | Galactic Center Observations with CTAO LST-1 |
| title_full | Galactic Center Observations with CTAO LST-1 |
| title_fullStr | Galactic Center Observations with CTAO LST-1 |
| title_full_unstemmed | Galactic Center Observations with CTAO LST-1 |
| title_short | Galactic Center Observations with CTAO LST-1 |
| title_sort | galactic center observations with ctao lst 1 |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2025/04/epjconf_ricap2024_05006.pdf |
| work_keys_str_mv | AT abeshotaro galacticcenterobservationswithctaolst1 AT abhishek galacticcenterobservationswithctaolst1 AT doromichele galacticcenterobservationswithctaolst1 AT inadatomohiro galacticcenterobservationswithctaolst1 AT strzysmarcel galacticcenterobservationswithctaolst1 AT teshimamasahiro galacticcenterobservationswithctaolst1 AT vovkievgen galacticcenterobservationswithctaolst1 |