SPI/INTEGRAL observation of 1809 keV gamma-ray line emission from the Cygnus X region
J Knödlseder, M Valsesia, M Allain, S Boggs… - arXiv preprint astro-ph …, 2004 - arxiv.org
arXiv preprint astro-ph/0405501, 2004•arxiv.org
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 73-93 deg and| b|< 7 deg at a significance level of 8
sigma. The 1809 keV line appears moderately broadened, with an intrinsic FWHM of 3.3+ …
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 73-93 deg and| b|< 7 deg at a significance level of 8
sigma. The 1809 keV line appears moderately broadened, with an intrinsic FWHM of 3.3+ …
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 73-93 deg and |b| < 7 deg 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 26Al ejecta kinematics.
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