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Post Info TOPIC: TeV J2032+4130
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RE: TeV J2032+4130
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Title: Observations of the Unidentified TeV Gamma-Ray Source TeV J2032+4130 with the Whipple Observatory 10 m Telescope
Authors: A. Konopelko, R. W. Atkins, G. Blaylock, J. H. Buckley, Y. Butt, D. A. Carter-Lewis, O. Celik, P. Cogan, Y. C. K. Chow, W. Cui, C. Dowdall, T. Ergin, A. D. Falcone, D. J. Fegan, S. J. Fegan, J. P. Finley, P. Fortin, G. H. Gillanders, K. J. Gutierrez, J. Hall, D. Hanna, D. Horan, S. B. Hughes, T. B. Humensky, A. Imran, I. Jung, P. Kaaret, G. E. Kenny, M. Kertzman, D. B. Kieda, J. Kildea, J. Knapp, K. Kosack, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, P. Moriarty, R. Mukherjee, T. Nagai, R. A. Ong, J. S. Perkins, M. Pohl, K. Ragan, P. T. Reynolds, H. J. Rose, G. H. Sembroski, M. Schroedter, A. W. Smith, D. Steele, A. Syson, S. P Swordy, J. A. Toner, L. Valcarcel, V. V. Vassiliev, R. G. Wagner, S. P. Wakely, T. C. Weekes, R. J. White, D. A. Williams, B. Zitzer

We report on observations of the sky region around the unidentified TeV gamma-ray source TeV J2032+4130 carried out with the Whipple Observatory 10 m atmospheric Cherenkov telescope for a total of 65.5 hrs between 2003 and 2005. The standard two-dimensional analysis developed by the Whipple collaboration for a stand-alone telescope reveals an excess in the field of view at a pre-trials significance level of 6.1 standard deviations. The measured position of this excess is alpha(2000) =20 h 32 m 27 s, delta(2000) = 41 deg 39 min 17 s. The estimated integral flux for this gamma-ray source is about 8% of the Crab-Nebula flux. The data are consistent with a point-like source. Here we present a detailed description of the standard two-dimensional analysis technique used for the analysis of data taken with the Whipple Observatory 10 m telescope and the results for the TeV J2032+4130 campaign. We include a short discussion of the physical mechanisms that may be responsible for the observed gamma-ray emission, based on possible association with known astrophysical objects, in particular Cygnus OB2.

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Blobrana


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Title: TeV J2032+4130: a not-so-dark Accelerator?
Authors: Yousaf M. Butt, Jorge A. Combi, Jeremy Drake, John P. Finley, Alexander Konopelko, Matthew Lister, Jerome Rodriguez

The HEGRA gamma-ray source TeV J2032+4130 is considered the prototypical 'dark accelerator', since it was the first TeV source detected with no known counterparts at lower frequencies. The Whipple collaboration confirmed its existence in archival data from 1989-90, and has also observed it more recently in data spanning 2003-5 using the 10m telescope of the Fred Lawrence Whipple Observatory. The analysis of the 2003-5 dataset indicates that the Whipple TeV emission hotspot is displaced about 9 arcminutes to the northeast of the HEGRA position. Here we report on a jet-like, dual-lobed non-thermal radio source which appears in the Westerbork Synthesis Radio Telescope (WSRT) dataset consistent with the locations of the Whipple and, to a lesser extent, also the HEGRA hotspot. A weak diffuse non-thermal radio condensation exists ~5 arcmin to the SW of this source, along the axis of the lobes and thus may be related. This diffuse radio condensation is located within the extent of the HEGRA source location. We propose this double-lobed non-thermal radio source, and the possibly-related radio condensation to its SW, as possible low-frequency counterparts of TeV J2032+4130. If true, it may be an analogue of the TeV-emitting non-blazar radiogalaxy, M87; alternatively, it may be related to a compact Galactic object, such as a microquasar. Thus, TeV J2032+4130 may not necessarily be related to Cygnus OB2 as suspected, and may not be a 'dark accelerator' after all. Further observations with the new generation of imaging Cherenkov telescopes are needed to pin down the location and morphology of the TeV emission region and thus clear up the confusion over its possible lower frequency counterparts.

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