9 papers
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…
LiBeB Evolution: Three Models
R. Ramaty, R. E. Lingenfelter, B. Kozlovsky
We consider the three principal LiBeB evolutionary models, CRI in which the cosmic-ray source at all epochs of Galactic evolution is the average ISM, CRI+LECR in which metal enrich…
Magnetic Field Limit on SGR 1900+14
R. E. Rothschild, D. Marsden, R. E. Lingenfelter
We measured the period and spin-down rate for SGR 1900+14 during the quiescient period two years before the recent interval of renewed burst activity. We have shown that the spin-d…