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SPATIALLY RESOLVING THE VERY HIGH ENERGY EMISSION FROM MGRO J2019+37 WITH VERITAS
Journal article   Open access

SPATIALLY RESOLVING THE VERY HIGH ENERGY EMISSION FROM MGRO J2019+37 WITH VERITAS

E. Aliu, T. Aune, B. Behera, M. Beilicke, W. Benbow, K. Berger, R. Bird, A. Bouvier, J. H. Buckley, V. Bugaev, …
The Astrophysical journal, v 788(1), pp 1-10
10 Jun 2014
url
https://doi.org/10.1088/0004-637x/788/1/78View
Published, Version of Record (VoR)Open Access (License Unspecified) Open
url
https://doi.org/10.1088/0004-637X/788/1/78View
Published, Version of Record (VoR) Open

Abstract

Astronomy & Astrophysics Physical Sciences Science & Technology
We present very high energy (VHE) imaging of MGRO J2019+37 obtained with the VERITAS observatory. The bright extended (similar to 2 degrees) unidentified Milagro source is located toward the rich star formation region Cygnus-X. MGRO J2019+37 is resolved into two VERITAS sources. The faint, point-like source VER J2016+371 overlaps CTB 87, a filled-center remnant (SNR) with no evidence of a supernova remnant shell at the present time. Its spectrum is well fit in the 0.65-10 TeV energy range by a power-law model with photon index 2.3 +/- 0.4. VER J2019+378 is a bright extended (similar to 1 degrees) source that likely accounts for the bulk of the Milagro emission and is notably coincident with PSR J2021+3651 and the star formation region Sh 2-104. Its spectrum in the range 1-30 TeV is well fit with a power-law model of photon index 1.75 +/- 0.3, among the hardest values measured in the VHE band, comparable to that observed near Vela-X. We explore the unusual spectrum and morphology in the radio and X-ray bands to constrain possible emission mechanisms for this source.

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Astronomy & Astrophysics
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