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Title: Investigating the TeV morphology of MGRO J1908+06 with veritas

We report on deep observations of the extended TeV gamma-ray source MGRO J1908+06 made with the VERITAS very high energy 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 (14σ) and measure a photon index of 2.20 ± 0.10{sub stat} ± 0.20{sub sys}. The TeV emission is extended, covering the region near PSR J1907+0602 and also extending toward SNR G40.5-0.5. When fitted with a two-dimensional Gaussian, the intrinsic extension has a standard deviation of σ{sub src} = 0.°44 ± 0.°02. 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 away.
Authors:
;  [1] ;  [2] ;  [3] ; ;  [4] ; ; ;  [5] ; ;  [6] ;  [7] ; ;  [8] ;  [9] ;  [10] ;  [11] ;  [12] ;  [13] ;  [14] more »; « less
  1. Department of Physics and Astronomy, Barnard College, Columbia University, NY 10027 (United States)
  2. Physics Department, McGill University, Montreal, QC H3A 2T8 (Canada)
  3. Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States)
  4. DESY, Platanenallee 6, D-15738 Zeuthen (Germany)
  5. Department of Physics, Washington University, St. Louis, MO 63130 (United States)
  6. Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645 (United States)
  7. Department of Physics and Astronomy and the Bartol Research Institute, University of Delaware, Newark, DE 19716 (United States)
  8. School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland)
  9. Department of Physics and Astronomy, Iowa State University, Ames, IA 50011 (United States)
  10. Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, IL 60605 (United States)
  11. School of Physics, National University of Ireland Galway, University Road, Galway (Ireland)
  12. Department of Physics, Purdue University, West Lafayette, IN 47907 (United States)
  13. School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455 (United States)
  14. Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637 (United States)
Publication Date:
OSTI Identifier:
22356734
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 787; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMIC GAMMA BURSTS; COVERINGS; EMISSION; GAMMA RADIATION; GAMMA SOURCES; NEBULAE; PULSARS; RESONANCE IONIZATION MASS SPECTROSCOPY; SPECTRA; SUPERNOVA REMNANTS; TEV RANGE; TWO-DIMENSIONAL CALCULATIONS