Discovery of a point-like very-high-energy gamma-ray source in Monoceros

F.A. Aharonian , A.G. Akhperjanian , A.R. Bazer-Bachi (1) , B. Behera , M. Beilicke , W. Benbow , D. Berge , K. Bernlohr , C. Boisson (2) , O. Bolz , V. Borrel (1) , I. Braun , E. Brion (3) , A.M. Brown , R. Buhler , I. Busching , T. Boutelier (4) , S. Carrigan , P.M. Chadwick , L.-M. Chounet (5) , G. Coignet (6) , R. Cornils , L. Costamante , B. Degrange , H.J. Dickinson , A. Djannati-Atai (7) , W. Domainko , L.O'C. Drury , G. Dubus (5) , K. Egberts , D. Emmanoulopoulos , P. Espigat (8) , C. Farnier (9) , F. Feinstein , A. Fiasson (9) , A. Forster , G. Fontaine (5) , Seb. Funk , S. Funk , M. Fussling , Y.A. Gallant (9) , B. Giebels (5) , J.F. Glicenstein (3) , B. Gluck , P. Goret (3) , C. Hadjichristidis , D. Hauser , M. Hauser , G. Heinzelmann , G. Henri , G. Hermann , J.A. Hinton , A. Hoffmann , W. Hofmann , M. Holleran , S. Hoppe , D. Horns , A. Jacholkowska (9) , O.C. de Jager , E. Kendziorra , M. Kerschhaggl , B. Khelifi (5) , Nu. Komin (9) , K. Kosack , G. Lamanna (6) , I.J. Latham , R. Le Gallou , A. Lemière (8) , M. Lemoine-Goumard (5) , T. Lohse , J.M. Martin (2) , O. Martineau-Huynh (10) , A. Marcowith (1, 9) , C. Masterson , G. Maurin (8) , T.J.L. Mccomb , Emmanuel Moulin (3, 9) , M. de Naurois , D. Nedbal , S.J. Nolan , A. Noutsos , J.-P. Olive (1) , K.J. Orford , J.L. Osborne , M. Panter , G. Pedaletti , G. Pelletier (4) , P.-O. Petrucci (4) , S. Pita (8) , G. Puhlhofer , M. Punch (8) , S. Ranchon (6) , B.C. Raubenheimer , M. Raue , S.M. Rayner , O. Reimer , J. Ripken , L. Rob , L. Rolland (3) , S. Rosier-Lees (6) , G. Rowell , J. Ruppel , V. Sahakian , A. Santangelo , L. Sauge (4) , S. Schlenker , R. Schlickeiser , R. Schroder , U. Schwanke , S. Schwarzburg , S. Schwemmer , A. Shalchi , H. Sol (2) , D. Spangler , R. Steenkamp , C. Stegmann , G. Superina (5) , P.H. Tam , J.-P. Tavernet (10) , R. Terrier (8) , M. Tluczykont (5) , C. van Eldik , G. Vasileiadis (9) , C. Venter , J.P. Vialle (6) , P. Vincent (10) , H.J. Volk , S.J. Wagner , M. Ward , Y. Moriguchi , Y. Fukui

1 CESR - Centre d'étude spatiale des rayonnements
2 LUTH (UMR_8102) - Laboratoire Univers et Théories
3 DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
4 LAOG - Laboratoire d'Astrophysique de Grenoble
5 LLR - Laboratoire Leprince-Ringuet
6 LAPP - Laboratoire d'Annecy de Physique des Particules
7 APC - AHE - APC - Astrophysique des Hautes Energies
8 APC (UMR_7164) - AstroParticule et Cosmologie
9 LPTA - Laboratoire de Physique Théorique et Astroparticules
10 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies

The complex Monoceros Loop SNR/Rosette Nebula region contains several potential sources of very-high-energy (VHE) gamma-ray emission and two as yet unidentified high-energy EGRET sources. Sensitive VHE observations are required to probe acceleration processes in this region. The H.E.S.S. telescope array has been used to search for very high-energy gamma-ray sources in this region. CO data from the NANTEN telescope were used to map the molecular clouds in the region, which could act as target material for gamma-ray production via hadronic interactions. We announce the discovery of a new gamma-ray source, HESS J0632+058, located close to the rim of the Monoceros SNR. This source is unresolved by H.E.S.S. and has no clear counterpart at other wavelengths but is possibly associated with the weak X-ray source 1RXS J063258.3+054857, the Be-star MWC 148 and/or the lower energy gamma-ray source 3EG J0634+0521. No evidence for an associated molecular cloud was found in the CO data.

Mots clés: Astrophysics; gamma rays: observations

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Astrophysique [astro-ph]

F.A. Aharonian, A.G. Akhperjanian, A.R. Bazer-Bachi, B. Behera, M. Beilicke, et al.. Discovery of a point-like very-high-energy gamma-ray source in Monoceros. Astronomy and Astrophysics - A&A, 2007, 469, pp.L1-L4. ⟨10.1051/0004-6361:20077299⟩. ⟨in2p3-00147240⟩