Investigating the TeV Morphology of MGRO J1908+06 with VERITAS
Abstract
We report on deep observations of the extended TeV gamma-ray source MGRO J1908+06 made with the VERITAS very high energy (VHE) gamma-ray observatory. Previously, the TeV emission has been attributed to the pulsar wind nebula (PWN) of the Fermi-LAT pulsar PSR J1907+0602. We detect MGRO J1908+06 at a significance level of 14 standard deviations (14 sigma) and measure a photon index of 2.20 +/- 0.10_stat +/- 0.20_sys. The TeV emission is extended, covering the region near PSR J1907+0602 and also extending towards SNR G40.5--0.5. When fitted with a 2-dimensional Gaussian, the intrinsic extension has a standard deviation of sigma_src = 0.44 +/- 0.02 degrees. In contrast to other TeV PWNe of similar age in which the TeV spectrum softens with distance from the pulsar, the TeV spectrum measured near the pulsar location is consistent with that measured at a position near the rim of G40.5--0.5, 0.33 degrees away.
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Cite
@article{arxiv.1404.7185,
title = {Investigating the TeV Morphology of MGRO J1908+06 with VERITAS},
author = {E. Aliu and S. Archambault and T. Aune and B. Behera and M. Beilicke and W. Benbow and K. Berger and R. Bird and J. H. Buckley and V. Bugaev and J. V Cardenzana and M. Cerruti and X. Chen and L. Ciupik and E. Collins-Hughes and M. P. Connolly and W. Cui and J. Dumm and V. V. Dwarkadas and M. Errando and A. Falcone and S. Federici and Q. Feng and J. P. Finley and H. Fleischhack and P. Fortin and L. Fortson and A. Furniss and N. Galante and D. Gall and G. H. Gillanders and S. Griffin and S. T. Griffiths and J. Grube and G. Gyuk and D. Hanna and J. Holder and G. Hughes and T. B. Humensky and P. Kaaret and M. Kertzman and Y. Khassen and D. Kieda and F. Krennrich and S. Kumar and M. J. Lang and A. S Madhavan and G. Maier and A. J. McCann and K. Meagher and J. Millis and P. Moriarty and R. Mukherjee and D. Nieto and A. O'Faolain de Bhroithe and R. A. Ong and A. N. Otte and D. Pandel and N. Park and M. Pohl and A. Popkow and H. Prokoph and J. Quinn and K. Ragan and J. Rajotte and G. Ratliff and L. C. Reyes and P. T. Reynolds and G. T. Richards and E. Roache and J. Rousselle and G. H. Sembroski and K. Shahinyan and F. Sheidaei and A. W. Smith and D. Staszak and I. Telezhinsky and K. Tsurusaki and J. V. Tucci and J. Tyler and A. Varlotta and V. V. Vassiliev and S. Vincent and S. P. Wakely and J. E. Ward and A. Weinstein and R. Welsing and A. Wilhelm},
journal= {arXiv preprint arXiv:1404.7185},
year = {2015}
}
Comments
To appear in ApJ, 8 pages