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A Multi-Wavelength Search for a Counterpart of the Unidentified Gamma-ray Source 3EG J2020+4017 (2CG078+2)In search of the counterpart to the brightest unidentified gamma-ray source 3EG J2020+4017 (2CG078+2) we report on new X-ray and radio observations of the gamma-Cygni field with the Chandra X-ray Observatory and with the Green Bank Telescope (GBT). We also report on reanalysis of archival ROSAT data. With Chandra it became possible for the first time to measure the position of the putative gamma-ray counterpart RX J2020.2+4026 with sub-arcsec accuracy and to deduce its X-ray spectra1 characteristics. These observations demonstrate that RX J2020.2+4026 is associated with a K field star and therefore is unlikely to be the counterpart of the bright gamma-ray source 2CG078+2 in the SNR G78.2+2.1 as had been previously suggested.
Document ID
20040075695
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Becker, Werner
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Weisskopf, Martin C.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Arzoumanian, Zaven
(Universities Space Research Association Greenbelt, MD, United States)
Lorimer, Duncan
(Manchester Univ. MacClesfield, United Kingdom)
Camilo, Fernando
(Columbia Univ. New York, NY, United States)
Elsner, Ronald F.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Kanbach, Gottfried
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Reimer, Olaf
(Ruhr Univ. Bochum, Germany)
Swartz, Douglas A.
(Universities Space Research Association Huntsville, AL, United States)
Tennant, Allyn F.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2004
Subject Category
Astrophysics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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