TeV Gamma-ray Observations of The Galactic Center Ridge By VERITAS

Abstract

The Galactic Center Ridge has been observed extensively in the past by both GeV and TeV gamma-ray instruments revealing a wealth of structure, including a diffuse component as well as the point sources G0.9+0.1 (a composite supernova remnant) and Sgr A* (believed to be associated with the supermassive black hole located at the center of our Galaxy). Previous very high energy (VHE) gamma-ray observations with the H.E.S.S. experiment have also detected an extended TeV gamma-ray component along the Galactic plane in the >300 GeV gamma-ray regime. Here we report on observations of the Galactic Center Ridge from 2010-2014 by the VERITAS telescope array in the >2 TeV energy range. From these observations we 1.) provide improved measurements of the differential energy spectrum for Sgr A* in the >2 TeV gamma-ray regime, 2.) provide a detection in the >2 TeV gamma-ray emission from the composite SNR G0.9+0.1 and an improved determination of its multi-TeV gamma-ray energy spectrum, 3.) report on the detection of VER J1746-289, a localized enhancement of >2 TeV gamma-ray emission along the Galactic plane.

arXiv comment9 pages, 5 figures, Accepted for Publication in The Astrophysical Journal

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• Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre
• Characterising the VHE diffuse emission in the central 200 parsecs of our Galaxy with H.E.S.S
• Heavy right-handed neutrino dark matter and PeV neutrinos at IceCube
• MAGIC observations of the diffuse $\gamma$-ray emission in the vicinity of the Galactic Centre
• ASTRI Mini-Array Core Science at the Observatorio del Teide
• VERITAS Observations of the Galactic Center Region at Multi-TeV Gamma-Ray Energies
• Improved Cosmic-Ray Injection Models and the Galactic Center Gamma-Ray Excess
• Observations of Sagittarius A* during the pericenter passage of the G2 object with MAGIC
• Search for Gamma-ray Spectral Lines from Dark Matter Annihilation up to 100 TeV towards the Galactic Center with MAGIC
• NuSTAR and Chandra Observation of the Galactic Center Non-thermal X-ray Filament G0.13-0.11: A Pulsar Wind Nebula Driven Magnetic Filament
• The CARMA 3mm Survey of the Inner $0.7^{\circ }\times 0.4^{\circ }$ of the Central Molecular Zone
• Search for Extended Sources of Neutrino Emission in the Galactic Plane with IceCube
• Latest Results from VERITAS: Gamma 2016
• Galactic Observatory Science with the ASTRI Mini-Array at the Observatorio del Teide
• Hadronic Interactions of Energetic Charged Particles in Protogalactic Outflow Environments and Implications for the Early Evolution of Galaxies
• High-energy gamma-ray emission from SNR G57.2+0.8 hosting SGR J1935+2154
• Constraining Models of the Pulsar Wind Nebula in SNR G0.9+0.1 via Simulation of its Detection Properties using the Cherenkov Telescope Array
• Observing the Energetic Universe at Very High Energies with the VERITAS Gamma Ray Observatory
• Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre
• An updated view and perspectives on high-energy gamma-ray emission from SGR J1935+2154 and its environment
• Constraining cosmic-ray acceleration in the magnetospheric gaps of Sgr A*
• A GeV-TeV particle component and the barrier of cosmic-ray sea in the Central Molecular Zone
• Origin of X-ray and gamma-ray emission from the Galactic central region
• High Energy Emission from the Galactic Center
• New Hard X-Ray and Multiwavelength Study of the PeVatron Candidate PWN G0.9+0.1 in the Galactic Center Region
• Search for long-term variability of HESS J1745-290