SPI/INTEGRAL observation of 1809 keV gamma-ray line emission from the Cygnus X region
ESA Special Publications(2004)
Abstract
We present first results on the observation of 1809 keV gamma-ray line emission from the Cygnus X region with the SPI imaging spectrometer. Our analysis is based on data from the performance verification phase of the INTEGRAL instruments and comprises 1.3 Ms of exposure time. We observe a 1809 keV line flux of (7.3 +/- 0.9) x 10(-5) ph cm(-2)s(-1) from a region delimited by galactic longitudes 73 degrees-93 degrees and vertical bar b vertical bar <= 7 degrees at a significance level of 8 sigma. The 1809 keV line appears moderately broadened, with an intrinsic FWHM of 3.3 +/- 1.3 keV. Although this broadening is only marginal (at the 2 sigma level our data are compatible with an unbroadened line), it could reflect the Al-26 ejecta kinematics.
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Key words
gamma rays : observations stars,O-type,Wolf-Rayet,supernovae,nudeosynthesis
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