The gamma-ray line of Ti-44, combined with radio observations, as a probe of supernova

Details The gamma-ray line of Ti-44, combined with radio observations, as a probe of supernova The gamma-ray line of Ti-44, combined with radio observations, as a probe of supernova

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..747s&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)747-(12)750

Astronomy and Astrophysics

Astronomy

1

Gamma Ray Astronomy, Line Spectra, Radio Astronomy, Radio Emission, Supernova Remnants, Supernovae, Titanium Isotopes, Calcium Isotopes, Gamma Ray Observatory, Interstellar Matter, Milky Way Galaxy, Radio Telescopes, Radioactive Decay, Scandium Isotopes, Shock Waves, Stellar Envelopes

Scientific paper

The decay of Ti-44 can be used to search for young Galactic supernova remnants (SNRs). While these objects may be hidden in obscured regions toward the inner Galaxy not accessible to optical telescopes, observations at both gamma ray and radio wavelengths can be used to discover and explore these objects. The Oriented Scintillation Spectrometer Experiment (OSSE) instrument on the Compton Gamma Ray Observatory (CGRO) can observe the gamma ray lines accompanying (Ti-44)-(Sc-44)-(Ca-44) decay, especially the 1.16 MeV line, and detect recent supernovae (SNe) with ages up to several centuries. Centimeter wavelength radio continuum observations can then be used to identify the young SNRs associated with the gamma-ray detections. The radio observations provide information on the interaction of the SN blast wave with the progenitor star's circumstellar environment and local interstellar medium (ISM), together with information on the expansion velocity and small scale structure of young SNRs. The determination of the radio morphology of young SNRs, whose SN type can be inferred from the gamma-ray observations, provides valuable insight into the interpretation of existing radio observations of older SNRs.

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