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

A. Archer; W. Benbow; R. Bird; M. Buchovecky; J. H. Buckley; V.; Bugaev; K. Byrum; J. V Cardenzana; M. Cerruti; X. Chen; L. Ciupik; E.; Collins-Hughes; M. P. Connolly; J. D. Eisch; A. Falcone; Q. Feng; J. P.; Finley; H. Fleischhack; A. Flinders; L. Fortson; A. Furniss; G. H.; Gillanders; S. Griffin; J. Grube; G. Gyuk; N. Hakansson; D. Hanna; J. Holder,; T. B. Humensky; M. Hutten; C. A. Johnson; P. Kaaret; P. Kar; N.; Kelley-Hoskins; M. Kertzman; D. Kieda; M. Krause; F. Krennrich; S. Kumar; M.; J. Lang; S. McArthur; A. McCann; K. Meagher; J. Millis; P. Moriarty; R.; Mukherjee; D. Nieto; R. A. Ong; N. Park; V. Pelassa; M. Pohl; A. Popkow; E.; Pueschel; J. Quinn; K. Ragan; G. Ratliff; P. T. Reynolds; G. T. Richards; E.; Roache; J. Rousselle; M. Santander; G. H. Sembroski; K. Shahinyan; A. W.; Smith; D. Staszak; I. Telezhinsky; J. V. Tucci; J. Tyler; V. V. Vassiliev; S.; P. Wakely; O. M. Weiner; A. Weinstein; A. Wilhelm; D. A. Williams; B. Zitzer; and F. Yusef-Zadeh

arXiv:1602.08522·astro-ph.HE·May 4, 2016

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

A. Archer, W. Benbow, R. Bird, M. Buchovecky, J. H. Buckley, V., Bugaev, K. Byrum, J. V Cardenzana, M. Cerruti, X. Chen, L. Ciupik, E., Collins-Hughes, M. P. Connolly, J. D. Eisch, A. Falcone, Q. Feng, J. P., Finley, H. Fleischhack, A. Flinders, L. Fortson, A. Furniss, G. H.

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TL;DR

This paper reports on VERITAS observations of the Galactic Center Ridge in the >2 TeV gamma-ray range, providing improved spectra for Sgr A*, detecting gamma-ray emission from G0.9+0.1, and identifying a new gamma-ray enhancement VER J1746-289.

Contribution

It offers new measurements and detections of TeV gamma-ray sources in the Galactic Center Ridge, enhancing understanding of high-energy processes in this region.

Findings

01

Improved differential energy spectrum for Sgr A* above 2 TeV.

02

Detection of gamma-ray emission from G0.9+0.1.

03

Discovery of the gamma-ray enhancement VER J1746-289.

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…

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