Although I am no longer active in this area of research, I still retain an interest.
My work in theoretical high energy astrophysics goes back to my graduate
student days at Penn State where I worked with
Prof. Peter I. Meszaros in the Dept. of Astronomy and Astrophysics.
We investigated the effects of ultra-strong magnetic fields on electron-photon
scattering cross sections and how this affects photon transport in a dense,
highly magnetized, plasma. Our motivations for these studies was to
theoretically reproduce the observed spectra of neutron stars in the
form of accreting X-ray pulsars and (at the time) gamma-ray bursters.
Former Students
David J. Dimattio,
M.S. Physics, St. Bonaventure University, 1993.
Thesis Title: The Effects of an Inhomogeneous
Accretion Cap on the Spectra of an X-Ray Pulsar
Current Position: Ph.D. candidate in Atmospheric Physics,
University of Missouri -- Rolla.
Jesse Davila Jr., M.S. Physics, Miami University, 1995.
Thesis Title: Aberration and Angle--Dependent Doppler Effects on the Spectra of Two Component
Accretion Column X-Ray Pulsars.
X--Ray Pulsar Two Line Spectra from a Two Component
Accretion Column,
Alexander, S.G., Davila, J., and Dimattio, D.J.,
Astrophysical Journal, v459, 666, 1996.
Abstract Reprint (postscript)
Radiative Widths and Splitting of Cyclotron Lines in
Superstrong Magnetic Fields,
Pavlov, G.G., Bezchastov, V.G., Meszaros, P., and Alexander, S.G.
Astrophysical Journal, v380, 541, 1991.
Abstract Reprint (postscript)
Magnetic Two-Photon Scattering and Two-Photon Emission:
Cross Sections and Redistribution Functions,
Alexander, S.G. and Meszaros, P.,
Astrophysical Journal, v372, 554, 1991.
Abstract Reprint (postscript)
Cyclotron Harmonics in Accreting Pulsars and Gamma-Ray
Bursters: Effect of Two-Photon Processes,
Alexander, S.G. and Meszaros, P.,
Astrophysical Journal, v372, 565, 1991.
Abstract Reprint (postscript)
Multiple-photon Compton scattering in a strong magnetic field:
Cross-sections and radiative transport, Alexander, S.G.,
Ph.D. Thesis, The Pennsylvania State University, 1990.
Abstract
Formation of Cyclotron Lines in Gamma-Ray Burst Spectra,
Alexander, S.G. and Meszaros, P.,
Astrophysical Journal Letters, v344, L1, 1989.
Abstract
Reprint (postscript)
The Nonlinear Transfer Problem in Accreting Pulsars:
Stimulated Scattering Effects,
Alexander, S.G., Meszaros, P., and Bussard, R.W.,
Astrophysical Journal, v342, 928, 1989.
Abstract Reprint (postscript)
One- and Two- Photon Compton Scattering in Strong Magnetic Fields,
Bussard, R.W., Alexander, S.G., and Meszaros, P.,
Physical Review D, v34, n2, 440, 1986.
Abstract
Soft Photon Production in X-Ray Pulsars,
Bussard, R.W., \Mesz, P., and Alexander, S.G.,
Astrophysical Journal Letters, v297, L21, 1985.
Abstract Reprint (postscript)
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