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      Discovery of the compact X-ray source inside the Cygnus Loop

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          Abstract

          We detected an X-ray compact source inside the Cygnus Loop during the observation project of the whole Cygnus Loop with the ASCA GIS. The source intensity is 0.11 c s\(^{-1}\) for GIS and 0.15 c s\(^{-1}\) for SIS, which is the strongest in the ASCA band. The X-ray spectra are well fitted by a power law spectrum of a photon index of \error{-2.1}{0.1} with neutral H column of (\error{3.1}{0.6})\({\rm \times 10^{21} cm^{-2}}\). Taking into account the interstellar absorption feature, this source is X-ray bright mainly above 1 keV suggesting either an AGN or a rotating neutron star. So far, we did not detect intensity variation nor coherent pulsation mainly due to the limited observation time. There are several optical bright stellar objects within the error region of the X-ray image. We carried out the optical spectroscopy for the brightest source (V=+12.6) and found it to be a G star. The follow up deep observation both in optical and in X-ray wavelengths are strongly required.

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          Author and article information

          Journal
          27 July 1998
          Article
          10.1093/pasj/50.5.475
          astro-ph/9807270
          4d3c26a3-877b-4125-b4d4-77d6a71c6f0d
          History
          Custom metadata
          Accepted for Publications of the Astronomical Society of Japan 17 pages, 3 figure
          astro-ph

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