Gamma-Ray Escape in Type IA Supernovae: The 847 keV--m B Diagram

Details Gamma-Ray Escape in Type IA Supernovae: The 847 keV--m B Diagram Gamma-Ray Escape in Type IA Supernovae: The 847 keV--m B Diagram

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...417..547r&link_type=abstract

Astrophysical Journal v.417, p.547

Astronomy and Astrophysics

Astrophysics

9

Scientific paper

The relationship between flux in the 847 keV line and optical (B) magnitude is examined for the two Type Ia supernovae (SNe Ia) observed so far in the γ-ray domain. This type of analysis allows us to discriminate between possible models for a given SN Ia event. In the case of SN 1991T in NGC 4527, in view of the constraints provided by CGRO on the flux of the 847 keV line and the B-magnitude of the supernova at the phase of the gamma-ray observation it is possible to discard many of the SN Ia models so far proposed. Models giving rise to a γ-ray escape fraction larger than 80% at 70-80 days after explosion do not fall within the validity region of the 847 keV flux-mB diagram. This diagram allows us to put limits on the distance to the host galaxy of the supernova and to investigate the reasonable range of values for the reddening, compatible with the observational and theoretical constraints. The case of SN 1986G, for which SMM upper limits are available (Matz & Share 1990), is examined as well.

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