Other
Scientific paper
Aug 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1269..144d&link_type=abstract
THE 10TH INTERNATIONAL SYMPOSIUM ON ORIGIN OF MATTER AND EVOLUTION OF GALAXIES: OMEG-2010. AIP Conference Proceedings, Volume 1
Other
Nucleosynthesis, Gamma-Ray Sources (Astronomical), Supernova Remnants, Interstellar Matter, Astronomical Telescopes, Origin, Formation, And Abundances Of The Elements, Gamma-Ray, Supernova Remnants, Interstellar Dust Grains, Diffuse Emission, Infrared Cirrus, X- And Gamma-Ray Telescopes And Instrumentation
Scientific paper
Gamma-ray line observations with INTEGRAL measure decay of unstable isotopes which are ejected from sites of nucleosynthesis. Massive stars are believed to be producers of gamma-ray emitting isotopes 44Ti, 26Al, 60Fe. Measurements with the Ge spectrometer have shown that (1) inner core-collapse supernova ejecta from the Cas A supernova remnant appear to still travel at velocities beyond a few hundred km/sec (2) 26Al synthesis occurs throughout the Galaxy corresponds to a supernova rate from core collapses of about one every 50 years; (3) 60Fe synthesis expected from massive stars is above the constraints from gamma-ray observations; 26Al synthesis in the Cygnus region appears on the high side of predictions from models; 26Al emission from the nearby Sco-Cen group of stars has been identified demonstrates massive-star activity close to the Sun. 26Al gamma-rays have been used to determine a longitude-velocity distribution of the presumably hot tenuous ISM which carries 26Al, which can be compared to molecular-gas star motions to help understand the Galaxy's bar spiral-arm structure. Implications of the above nucleosynthesis constraints suggest that INTEGRAL's observed positron annihilation gamma-rays need a contribution from another source located in the central regions of our Galaxy, and/or positrons may propagate kpc-distances away from their sources before annihilating.
Diehl Roland
Kretschmer Karsten
Lang Michael
Martin Pierrick
Ohlendorf Henrike
No associations
LandOfFree
Massive-Star Nucleosynthesis: Lessons from INTEGRAL 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 Massive-Star Nucleosynthesis: Lessons from INTEGRAL, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Massive-Star Nucleosynthesis: Lessons from INTEGRAL will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1862495