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The Galactic Positron Annihilation Radiation & The Propagation of Positrons in the Interstellar Medium
J. C. Higdon, R. E. Lingenfelter, R. E. Rothschild
We consider positron propagation in the interstellar medium and show that the positrons from the beta-plus decay chains of the radioactive nuclei Ni-56, Ti-44, and Al-26, produced…
The Galactic 26Al Problem and The Close Binary SNIb/c Solution?
J. C. Higdon, R. E. Lingenfelter, R. E. Rothschild
The origin of the long-lived radioactive 26Al, which has been observed in the Galactic interstellar medium from its 1.809 MeV decay gamma-ray line emission, has been a persistent p…
Propeller vs. Magnetar Concepts for SGR/AXPs
Richard E. Rothschild, Richard E. Lingenfelter, David Marsden
Two lines of thought exist as to the nature of Soft Gamma-ray Repeaters (SGRs) and Anomalous X-ray Pulsars (AXPs). On the one hand,we have neutron stars with super-critical magneti…
Fossil Disks and Propellor Spindown of SGR/AXPs
Richard E. Rothschild, David Marsden, Richard E. Lingenfelter
We have shown that the interstellar media which surround the progenitors of SGRs and AXPs were unusually dense compared to the environments around most young radio pulsars. This en…
Resolution of the Age Discrepancies in Pulsar/SNR Associations
D. Marsden, R. E. Lingenfelter, R. E. Rothschild
Pulsars associated with supernova remnants (SNRs) are valuable because they provide constraints on the mechanism(s) of pulsar spin-down. Here we discuss two SNR/pulsar associations…
LiBeB, O and Fe Evolution: Refractory Element and Cosmic Ray Transport Delays
R. Ramaty, B. Kozlovsky, R. E. Lingenfelter
Employing a Monte-Carlo based evolutionary code, we show that the delay of Fe deposition relative to O, due to the incorporation of supernova ejecta refractories in high velocity g…