Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00641086" target="_blank" >RIV/67985815:_____/25:00641086 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/25:00641086 RIV/00216208:11320/25:10510610 RIV/61989592:15310/25:73632226

Výsledek na webu

<a href="https://hdl.handle.net/11104/0371291" target="_blank" >https://hdl.handle.net/11104/0371291</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202452447" target="_blank" >10.1051/0004-6361/202452447</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission

Popis výsledku v původním jazyce

Context. The recurrent nova RS Ophiuchi (RS Oph) underwent a thermonuclear eruption in August 2021. In this event, RS Oph was detected by the High Energy Stereoscopic System (H.E.S.S.), the Major Atmospheric Gamma Imaging Cherenkov (MAGIC), and the first Large-Sized Telescope (LST-1) of the future Cherenkov Telescope Array Observatory (CTAO) at very-high gamma-ray energies above 100 GeV. This means that novae are a new class of very-high-energy (VHE) gamma-ray emitters. Aims. We report the analysis of the RS Oph observations with LST-1. We constrain the particle population that causes the observed emission in hadronic and leptonic scenarios. Additionally, we study the prospects of detecting further novae using LST-1 and the upcoming LST array of CTAO-North. Methods. We conducted target-of-opportunity observations with LST-1 from the first day of this nova event. The data were analysed in the framework of cta-lstchain and Gammapy, the official CTAO-LST reconstruction and analysis packages. One-zone hadronic and leptonic models were considered to model the gamma-ray emission of RS Oph using the spectral information from Fermi-LAT and LST-1, together with public data from the MAGIC and H.E.S.S. telescopes. Results. RS Oph was detected at 6.6 sigma with LST-1 in the first 6.35 hours of observations following the eruption. The hadronic scenario is preferred over the leptonic scenario considering a proton energy spectrum with a power-law model with an exponential cuto ff whose position increases from (0.26 +/- 0.08) TeV on day 1 up to (1.6 +/- 0.6) TeV on day 4 after the eruption. The deep sensitivity and low energy threshold of the LST-1 /LST array will allow us to detect faint novae and increase their discovery rate.

Název v anglickém jazyce

Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission

Popis výsledku anglicky

Context. The recurrent nova RS Ophiuchi (RS Oph) underwent a thermonuclear eruption in August 2021. In this event, RS Oph was detected by the High Energy Stereoscopic System (H.E.S.S.), the Major Atmospheric Gamma Imaging Cherenkov (MAGIC), and the first Large-Sized Telescope (LST-1) of the future Cherenkov Telescope Array Observatory (CTAO) at very-high gamma-ray energies above 100 GeV. This means that novae are a new class of very-high-energy (VHE) gamma-ray emitters. Aims. We report the analysis of the RS Oph observations with LST-1. We constrain the particle population that causes the observed emission in hadronic and leptonic scenarios. Additionally, we study the prospects of detecting further novae using LST-1 and the upcoming LST array of CTAO-North. Methods. We conducted target-of-opportunity observations with LST-1 from the first day of this nova event. The data were analysed in the framework of cta-lstchain and Gammapy, the official CTAO-LST reconstruction and analysis packages. One-zone hadronic and leptonic models were considered to model the gamma-ray emission of RS Oph using the spectral information from Fermi-LAT and LST-1, together with public data from the MAGIC and H.E.S.S. telescopes. Results. RS Oph was detected at 6.6 sigma with LST-1 in the first 6.35 hours of observations following the eruption. The hadronic scenario is preferred over the leptonic scenario considering a proton energy spectrum with a power-law model with an exponential cuto ff whose position increases from (0.26 +/- 0.08) TeV on day 1 up to (1.6 +/- 0.6) TeV on day 4 after the eruption. The deep sensitivity and low energy threshold of the LST-1 /LST array will allow us to detect faint novae and increase their discovery rate.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Svazek periodika

695

Číslo periodika v rámci svazku

Mar

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

18

Strana od-do

A152

Kód UT WoS článku

001451476900001

EID výsledku v databázi Scopus

2-s2.0-105001108762