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arxiv: 1602.08522 · v1 · submitted 2016-02-26 · 🌌 astro-ph.HE

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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
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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 F. Yusef-Zadeh
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classification 🌌 astro-ph.HE
keywords gamma-raygalacticcenterenergyobservationsridgealongcomponent
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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.

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