TeV gamma-ray diffuse emissions in the Galactic Center Region with CTAO LST-1

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00645999" target="_blank" >RIV/67985815:_____/25:00645999 - isvavai.cz</a>

Alternative codes found

RIV/68378271:_____/25:00645999 RIV/61989592:15310/25:73635267

Result on the web

<a href="https://pos.sissa.it/501/542/pdf" target="_blank" >https://pos.sissa.it/501/542/pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.22323/1.501.0542" target="_blank" >10.22323/1.501.0542</a>

Result language

angličtina

Original language name

TeV gamma-ray diffuse emissions in the Galactic Center Region with CTAO LST-1

Original language description

Imaging Atmospheric Cherenkov Telescopes (IACTs), including H.E.S.S., MAGIC, and VERITAS, have detected very-high-energy gamma rays from the central region of the Milky Way. The PeVatron hypothesis posits that the supermassive black hole Sagittarius A* (Sgr A*) accelerates cosmic rays to PeV energies, producing a diffuse gamma-ray emission extending up to tens of TeV across the central molecular zone. However, previous IACT studies have yielded inconsistent results due to methodological differences, complicating direct comparison and interpretation. H.E.S.S. initially suggested a power-law spectrum within the sector-annulus region (20-60 pc), whereas the MAGIC telescopes recently presented a 2-sigma hint of a spectral cutoff at ∼ 20 TeV for the total ridge emission (∼ 200 pc), although H.E.S.S. and VERITAS have not obtained a sign of cut-off for that emission. The first Large-Sized Telescope (LST-1) at the Northern site of the Cherenkov Telescope Array Observatory (CTAO) offers enhanced TeV sensitivity, despite its higher energy threshold, at large zenith angles. Its wide field of view (∼ 4.5 deg) enables more uniform Galactic ridge coverage than other Northern IACTs. In this study, LST-1 observations reconfirm a spectral cutoff around 20 TeV with a significance of about 3 sigma over a pure power law, demonstrating its capability of TeV observations of extended sources and refining our understanding of cosmic-ray acceleration in the Galactic Center.n

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Proceedings of Science

ISBN

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ISSN

1824-8039

e-ISSN

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Number of pages

10

Pages from-to

542

Publisher name

Sissa Medilab srl

Place of publication

Trieste

Event location

Ženeva

Event date

Jul 15, 2025

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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