44Ti Gamma-Ray Line
Emission from Cas A and RXJ0852-4622/GROJ0852-4642
A. F. Iyudin, V. Schönfelder, W. Collmar, R. Diehl, G.G. Lichti,
S. Plüschke, A. Strong
H. Bloemen, W. Hermsen
J. Knödlseder
J. Ryan
C. Winkler
Abstract
COMPTEL's discovery of 44Ti line emission at 1.16 MeV
from Cas A, the youngest known Galactic SNR, has opened the possibility to
search for otherwise undetected Galactic supernova remnants through
penetrating MeV photons. The 6 year 44Ti line emission survey (from
~ 8 years mission
database) performed by COMPTEL onboard the Compton Gamma Ray Observatory
(CGRO) had resulted in the detection of the 1.157 MeV line emission from
a previously
unknown and optically undetected SNR in the Vela region,
discovered by ROSAT via its X-ray emission (RXJ0852-4622/GROJ0852-4642).
Limitations in 44Ti line searches arise from uncertainties in our
different background modelling techniques, and our event selection criteria
to supress a large part of the overwhelming background.
Therefore, we have reevaluated the significance of the reported COMPTEL
detection in great detail now and will present the current status.
File translated from TEX by TTH, version 2.32.
On 16 Jul 1999, 09:19.