Reassessment of the 56Co emission from SN 1991T

Details Reassessment of the 56Co emission from SN 1991T Reassessment of the 56Co emission from SN 1991T

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..410.1084m&link_type=abstract

The fourth compton symposium. AIP Conference Proceedings, Volume 410, pp. 1084-1088 (1997).

Computer Science

19

Supernovae, Gamma-Ray

Scientific paper

The detection of 56Co emission from SN 1991T has been previously reported at a level near the COMPTEL sensitivity threshold. The spectral analysis method, fitting the count spectrum to a background model plus a 56Co emission template, is subject to possible systematic effects which had not been thoroughly studied at that time. To better evaluate the significance of that ~3.3σ detection, the same method has been applied to a grid of points with 5° spacing, out to 35° from the pointing direction, in each of 103 observing periods from phases 1 through 3. A dozen instances were found with a 56Co signal as significant as that for either of the two observations of SN 1991T alone (~2σ). Nothing was found as significant as the combined observations of SN 1991T. The strongest instrumental background artifact in the vicinity of the two principal 56Co lines, attributed to 27Mg, falls between the 56Co lines. It fills in the valley between those lines, and so will obscure real 56Co emission rather than producing false 56Co sources. Fortunately, this artifact was weak up to the time of the reboost during phase 3. Thus, it is very unlikely that the reported emission from SN 1991T was a statistical fluctuation or instrumental artifact. But, since the flux was so near the detection threshold, little can be said about the gamma-ray light curve of the supernova, the relative strengths of the 56Co lines, or the line widths.

Affiliated with

Also associated with

No associations

Rating

Reassessment of the 56Co emission from SN 1991T does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Reassessment of the 56Co emission from SN 1991T, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reassessment of the 56Co emission from SN 1991T will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-834168