NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
A Search for the X-ray Counterpart of the Unidentified Gamma-ray Source 3EG J2020+4017 (2CG078+2)We report observations with the Chandra X-ray Observatory of a field in the gamma-Cygni supernova remnant (SNR78.2+2.1) centered on the cataloged location of the unidentified, bright gamma-ray source 3EG J2020+4017. In this search for an X-ray counterpart to the gamma-ray source, we detected 30 X-ray sources. Of these, we found 17 strong-candidate counterparts in optical (visible through near-infrared) cataloged and an additional 3 through our optical observations. Based upon colors and (for several objects) optical spectra, nearly all the optically identified objects appear to be reddened main-sequence stars: None of the X-ray sources with an optical counterpart is a plausible X-ray counterpart to 3EG J2020+4017-if that gamma-ray source is a spin-powered pulsar. Many of the 10 X-ray sources lacking optical counterparts are likely (extragalactic) active galactic nuclei, based upon the sky density of such sources. Although one of the 10 optically unidentified X-ray sources could be the gamma-ray source, there is no auxiliary evidence supporting such an identification
Document ID
20060047618
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Weisskopf, Martin
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Swartz, Douglas A.
(Universities Space Research Association Huntsville, AL, United States)
Carraminana, Alberto
(Instituto Nacional de Astrofisica, Optica y Electronica Puebla, Mexico)
Carrasco, Luis
(Instituto Nacional de Astrofisica, Optica y Electronica Puebla, Mexico)
Kaplan, David L.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Becker, Werner
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Elsner, Ronald F.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Kanbach, Gottfried
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
ODell, Stephen L.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Tennant, Allyn F.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2006
Publication Information
Publication: Submitted to The Astrophysical Journal
Subject Category
Astronomy
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available