Observation of the TeV gamma-ray source MGRO J1908+06 with ARGO-YBJ

Abstract

The extended gamma ray source MGRO J1908+06, discovered by the Milagro air shower detector in 2007, has been observed for about 4 years by the ARGO-YBJ experiment at TeV energies, with a statistical significance of 6.2 standard deviations. The peak of the signal is found at a position consistent with the pulsar PSR J1907+0602. Parametrizing the source shape with a two-dimensional Gauss function we estimate an extension σ= 0.49 \pm 0.22 degrees, consistent with a previous measurement by the Cherenkov Array H.E.S.S.. The observed energy spectrum is dN/dE = 6.1 \pm 1.4 \times 10^-13 (E/4 TeV)^{-2.54 \pm 0.36} photons cm^-2 s^-1 TeV^-1, in the energy range 1-20 TeV. The measured gamma ray flux is consistent with the results of the Milagro detector, but is 2-3 times larger than the flux previously derived by H.E.S.S. at energies of a few TeV. The continuity of the Milagro and ARGO-YBJ observations and the stable excess rate observed by ARGO-YBJ along 4 years of data taking support the identification of MGRO J1908+06 as the steady powerful TeV pulsar wind nebula of PSR J1907+0602, with an integrated luminosity above 1 TeV about 1.8 times the Crab Nebula luminosity.

6 pages, accepted for pubblication by ApJ. Replaced to correct the author list

References in corpus (10)

• Fermi Large Area Telescope Second Source Catalog
• Fermi Large Area Telescope Bright Gamma-ray Source List
• TeV Gamma-Ray Sources from a Survey of the Galactic Plane with Milagro
• Inverse Compton Origin of the Hard X-Ray and Soft Gamma-Ray Emission from the Galactic Ridge
• Milagro Observations of Multi-TeV Emission from Galactic Sources in the Fermi Bright Source List
• HESS VHE Gamma-Ray Sources Without Identified Counterparts
• Observation of the Cosmic Ray Moon shadowing effect with ARGO-YBJ
• Spectrum and Morphology of the Two Brightest Milagro Sources in the Cygnus Region: MGRO J2019+37 and MGRO J2031+41
• Observation of TeV gamma rays from the Cygnus region with the ARGO-YBJ experiment
• Detector Time Offset and Off-line Calibration in EAS Experiments

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• Reevaluation of the Prospect of Observing Neutrinos from Galactic Sources in the Light of Recent Results in Gamma Ray and Neutrino Astronomy
• Crab Nebula: five-year observation with ARGO-YBJ
• Investigating the TeV Morphology of MGRO J1908+06 with VERITAS
• Prospects for Detecting Galactic Sources of Cosmic Neutrinos with IceCube: An Update
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• Multiwavelength Investigation of $\gamma$-ray Source MGRO J1908+06 Emission Using Fermi-LAT, VERITAS, and HAWC
• Detecting the brightest HAWC sources with IceCube in the upcoming years
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• Dark photon constraints using the UHE gamma-ray emission from galactic sources. A Phenomenological Study
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