1999/06/29 by Jacco Vink, J. S. Kaastra, Jelle S. Kaastra +4 · 14 citations
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Cosmic Phenomena #Cassiopeia A #Emission spectrum #Flux (metallurgy) #Gamma-ray bursts and supernovae #Line (geometry) #Physics #Spectral line #Supernova #Supernova remnant #astro-ph
paper · pdf · doi:10.1016/s0273-1177(99)00823-6
published in Advances in Space Research 25(3-4), 689-694 (Elsevier BV) · ; JVs present address: AIP, Potsdam ([email protected]). To be published in Advances of Space Research (proc. of the Cospar Conference, Nagoya, 1998). 6 pages, 3 figures
arxiv created 1999/06/29 · openalex publication_date 2000/01/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present an analysis of the BeppoSAX high X-ray energy spectrum of the supernova remnant Cassiopeia A with an observation time of 83 ks. We measure a flux upper limit of 4.1E-5 ph/cm2/s (99.7% confidence) of the nuclear decay lines of Ti-44 at 68 keV and 78 keV that is lower and inconsistent with the flux of an accompanying line at 1157 keV measured by CGRO's Comptel. However, if the underlying X-ray continuum is lower, because the spectrum is steepening, the actual Ti-44 flux may be higher and consistent with the Comptel result, although the measured flux of (2.9 +/- 1.0)E-5 ph/cm2/s under this assumption is still lower than the flux measured by Comptel.