Astrophysical Gamma Ray Emission Lines
نویسندگان
چکیده
We review the wide range of astrophysical observations of gamma ray emission lines and we discuss their implications. We consider line emission from solar flares, the Orion molecular cloud complex, supernovae 1987A and 1991T, the supernova remnants Cas A and Vela, the interstellar medium, the Galactic center region and several Galactic black hole candidates. The observations have important, and often unique, implications on particle acceleration, star formation, processes of nucleosynthesis, Galactic evolution and compact object physics.
منابع مشابه
Integral and Nuclear Astrophysics
We briefly review the fundamentals of nuclear gamma-ray line astronomy (radioactive astronomy), focusing on its role to decipher the intimate physics of supernovae, either immediatly (via 56 Co) or after a time delay (via 44 T i). All kinds of super-novae can be in principle tested through their radioactivities and their associated gamma-ray lines. Dedicated to the spectroscopy and imaging of c...
متن کاملA Comprehensive Search for Gamma-ray Lines in the First Year of Data from the Integral Spectrometer
We have carried out an extensive search for gamma-ray lines in the first year of public data from the Spectrometer (SPI) on the INTEGRAL mission. INTEGRAL has spent a large fraction of its observing time in the Galactic Plane with particular concentration in the Galactic Center (GC) region (∼ 3 Msec in the first year). Hence the most sensitive search regions are in the Galactic Plane and Center...
متن کاملDelayed Nickel Decay in Gamma-ray Bursts
Recently observed emission lines in the X-ray afterglow of -ray bursts suggest that iron-group elements are either produced in the -ray burst or are present nearby. If this material is the product of a thermonuclear burn, then such material would be expected to be rich in nickel-56. If the nickel remains partially ionized, this prevents the electron capture reaction normally associated with the...
متن کاملPolarization mesurements of gamma ray bursts and axion like particles
A polarized gamma ray emission spread over a sufficiently wide energy band from a strongly magnetized astrophysical object like gamma ray bursts (GRBs) offers an opportunity to test the hypothesis of axion like particles (ALPs). Based on evidences of polarized gamma ray emission detected in several gamma ray bursts we estimated the level of ALPs induced dichroism, which could take place in the ...
متن کاملDelayed Nickel Decay in γ-ray bursts
Recently observed emission lines in the X-ray afterglow of gamma ray bursts suggest that iron group elements are either produced in the γ-ray burst or are present nearby. If this material is the product of a thermonuclear burn, then such material would be expected to be rich in Nickel-56. If the nickel remains partially ionized, this prevents the electron capture reaction normally associated wi...
متن کامل