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,Ranjana P Bird,A Bouvier,J H Buckley,V Bugaev,M Cerruti,Xu Chen,L Ciupik, M P Connolly,W Cui,J P Dumm,Vikram Vasant Dwarkadas,M Errando,A Falcone,S Federici,Q Feng,J P Finley,H Fleischhack,Paul R Fortin,L Fortson,A Furniss,N Galante,G H Gillanders,E V Gotthelf,Steven T Griffin,Scott Griffiths, J Grube,G Gyuk,D S Hanna,J Holder,Graham R V Hughes,T B Humensky, Chris A Johnson,Philip Kaaret,Oleg Kargaltsev,M Kertzman,Y Khassen,D B Kieda, F Krennrich,M J Lang,A S Madhavan, G Maier,S Mcarthur,A Mccann,J Millis,P Moriarty,R Mukherjee,D Nieto, A Ofaolain De Bhroithe,R A Ong,A N Otte,D Pandel,N Park,M Pohl, A Popkow,H Prokoph,John J Quinn,K Ragan,J Rajotte,L C Reyes,P T Reynolds,Gordon T Richards,E Roache,Mallory Strider Ellison Roberts,G H Sembroski, K Shahinyan,A W Smith,D Staszak,I Telezhinsky, J V Tucci,J Tyler,S Vincent,S P Wakely,A J R Weinstein, R Welsing,A Wilhelm,David A Williams,B Zitzer

ASTROPHYSICAL JOURNAL（2014）

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摘要

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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关键词

gamma rays : stars,pulsars : individual (PSR J2021+3651),supernovae : individual (CTB 87)

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