Galactic Working Group

CTA (Cherenkov Telescope Array) is the next generation ground-based observatory for gamma-ray astronomy at very-high energies. The Large-Sized Telescope prototype (LST-1) is located at
the Northern site of CTA, on the Canary Island of La Palma. LSTs are designed to provide optimal performance in the lowest part of the energy range covered by CTA, down to ≃20 GeV. LST-1
started performing astronomical observations in November 2019, during its commissioning phase, and it has been taking data since then. We present the first LST-1 observations of the Crab Nebula,
the standard candle of very-high energy gamma-ray astronomy, and use them, together with simulations, to assess the basic performance parameters of the telescope. The data sample consists of
around 36 hours of observations at low zenith angles collected between November 2020 and March 2022. LST-1 has reached the expected performance during its commissioning period - only a minor
adjustment of the preexisting simulations was needed to match the telescope behavior. The energy threshold at trigger level is estimated to be around 20 GeV, rising to ≃30 GeV after data analysis.
Performance parameters depend strongly on energy, and on the strength of the gamma-ray selection cuts in the analysis: angular resolution ranges from 0.12 to 0.40 degrees, and energy resolution
from 15 to 50%. Flux sensitivity is around 1.1% of the Crab Nebula flux above 250 GeV for a 50-h observation (12% for 30 minutes). The spectral energy distribution (in the 0.03 - 30 TeV range) and
the light curve obtained for the Crab Nebula agree with previous measurements, considering statistical and systematic uncertainties. A clear periodic signal is also detected from the pulsar at
the center of the Nebula.

Link: Project Webpage

Crab Pulsar[edit]

PI: Team:
Abstract:
Link: Project Webpage

Boomerang SNR[edit]

PI: Team: F. Cassol
Abstract:
Link: Project Webpage

T CrB[edit]

PI: Team:
Abstract:
Link: Project Webpage

Geminga Pulsar[edit]

PI: Team:
Abstract:
Link: Project Webpage

SGR 1935+2154[edit]

PI: Team:
Abstract:
Link: Project Webpage

SN 2023ixf[edit]

PI: Alicia López-Oramas; Team: Arnau Aguasca-Cabot, Alessandro Carosi, Giorgio Pirola
Abstract: Core-collapse SN that exploded in May 2023
Link: Project Webpage

SN 2024bch[edit]

PI: Alicia López-Oramas; Team: Arnau Aguasca-Cabot, Alessandro Carosi, Andrea Simognini
Abstract: CCSNe triggered via Galactic ToO. LST-1 only project
Link: Project Webpage

Cygnus X North region[edit]

PI: Team:
Abstract:
Link:

Publications[edit]

Papers Status

Proceedings

Observed Galactic Sources[edit]

Full up-to-date list of all observed sources: Sources observed with LST-1

Sources with total integration time > 5 hours (updated: 17 Jun 2024):

Crab: 380.0 hours, LHAASO J2108+5157: 92.6 hours, Geminga: 77.6 hours, G106.3+2.7: 72.5 hours, GalacticCenter: 56.6 hours, SN_2023ixf: 46.2 hours, Cygnus_XNorth: 35.6 hours, PSR J2021+3651: 35.3 hours, LHAASO J1956+2845: 32.7 hours, SGR 1935+2154: 31.8 hours, LHAASO J0341+5258: 28.7 hours, SDSS J1430+2303: 28.2 hours, LS I +61 303: 26.2 hours, V4641: 17.6 hours, SN2024bch: 16.0 hours, Nova_RS_Oph: 15.0 hours, PSR J2032+4127: 14.3 hours, OffCrab: 11.6 hours, U Sco: 10.9 hours, 1LHAASO_J1906+0712: 7.4 hours, G17.8+16.7: 7.2 hours, PSR J1402+13: 5.7 hours, WR140: 5.7 hours, GalCenter_field1: 5.6 hours, GalCenter_field2: 5.1 hours,