Abstract
The Large Magellanic Cloud (LMC) is a spiral galaxy, satellite of the Milky way with a high star formation activity. It represents a unique laboratory for studying an extended and spatially resolved star-forming galaxy through gamma-ray observatories. Therefore, the LMC survey is one of the key science projects for the Cherenkov Telescope Array (CTA), the next-generation ground-based gamma-ray observatory. In this document we present the work performed over the last year by the CTA working group dedicated to the LMC, in order to offer a first characterization of the LMC at TeV energies. We have performed detectability forecasts based on the expected CTA performance for all sources in the region of interest of the LMC with known emission at GeV energies and above. Based on previous observations made by Fermi-LAT and H.E.S.S. we have characterized all point sources, extended sources and diffuse emission produced by cosmic-ray propagation, extrapolating their spectra to CTA energies. Finally, we have characterized the signal expected by different annihilation mechanisms of dark matter (DM) particles within the LMC, computing the detection sensitivity curve for this target in the cross-section-to-mass plane.
Highlights
The Large Magellanic Cloud (LMC) is a satellite galaxy of the Milky Way with unique characteristics that make it a valuable target for gamma-ray observations
We study the forecasts on detecting the already known gammaray emission coming from sources in LMC with the Southern Array of Cherenkov Telescope Array (CTA), the next-generation of ground-based gamma-ray observatories which is already in construction
We have used one of the proposed analysis softwares for CTA, the ctools [5] combined with a custom pipeline to do a likelihood fit over a simulated survey of the LMC, and we have calculated the significances of the individual sources as seen with CTA
Summary
The LMC is a satellite galaxy of the Milky Way with unique characteristics that make it a valuable target for gamma-ray observations. It is located in the Southern hemisphere at a galactic latitude of -32.9o off the galactic plane, with a disk shape almost faced on (with a small inclination angle of 3040o). We study the forecasts on detecting the already known gammaray emission coming from sources in LMC with the Southern Array of CTA, the next-generation of ground-based gamma-ray observatories which is already in construction.
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