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Richard Rothschild

Research Scientist, Adjunct Lecturer in Physics, Lead Scientist of the High Energy Astrophysics group

Office: SERF 413
Phone: (858) 534-3462

Related Websites



Dr. Rothschild is a member of NASA review panel for the US contribution to the Japanese Astro-H mission, member of the INTEGRAL Users Group, member of the instrument working group and science associate for the International X-ray Observatory, member of review team for future NASA missions, and occasional member of observing proposal review teams for NASA.

Research Interests

High energy astrophysics, including but not limited to accreting X-ray pulsars, active galactic nuclei, high energy emission from clusters of galaxies; nuclear astrophysics, including the 511 keV positron annihilation radiation, and other line radiation (Al-26, Ti-44, etc.); high energy astrophysics instrumentation, including coded mask imaging and hard X-ray imaging telescopes; mission development, such as the MIRAX concept to monitor X-ray temporal variability for the central region of the Galaxy, hard X-ray telescope missions such as Nustar, Astro-H, and the International X-ray Observatory; humanitarian demining; and detection/monitoring of radionuclides at a distance.


Dr. Rothschild is the lead scientist for the High Energy Astrophysics group, which is nearing the end of the Rossi X-ray Timing Explorer (RXTE) mission for which it provided the High Energy X-ray Timing Experiment (HEXTE), and will continue to analyze the data from it for years to come. The group is currently analyzing observations of accreting X-ray pulsars, active galactic nuclei, and cluster of galaxies from data from INTEGRAL, Suzaku, and Swift missions. This includes some multi-wavelength investigations, all of which are aimed at understanding the behavior of matter under extreme conditions (temperature, gravity, magnetic fields, and radiation). They are continuing to promote the US/Brazil MIRAX mission to monitor the transient X-ray phenomena from the central regions of the Galaxy, where the preponderance of stars reside, and collaborate on the High Energy X-ray Imager instrument for the International X-ray Observatory. They are also continuing to develop an X-ray backscatter coded mask imager for humanitarian demining in collaboration with Defence R&D Canada Suffield.

Select Publications

--- 2009 ---

Is There a Dark Matter Signal in the Galactic Positron Annihilation Radiation? 2009, Physical Review Letters, 103, 031301 Lingenfelter, R.E., Higdon, J.C., and Rothschild, R.E.

The Galactic Positron Annihilation Radiation and the Propagation of Positrons in the Interstellar Medium 2009, The Astrophysical journal, 698, 350 Higdon, J.C., Lingenfelter, R.E., and Rothschild, R.E.

Temporal Variations of Strength and Location of the South Atlantic Anomaly as Measured by RXTE 2009, Earth and Planetary Science Letters, 281, 125 Fuerst, F., Wilms, J., Rothschild, R.E., Pottschmidt, K., Smith, D.M., andLingenfelter, R.

The X-ray Halo of Cen X-3 2009, The Astrophysical Journal, 691, 1744 Thompson, Thomas W. J.and Rothschild, Richard E.

Two ~35 Day Clocks in Hercules X-1: Evidence for Neutron Star Free Precession 2009, Astronomy and Astrophysics, 494, 1025 Staubert, R., Klochkov, D., Postnov, K., Shakura, N., Wilms, J., and Rothschild, R.E.

A New XMM_Newton Long Look of the Low-Luminosity Active Galactic Nucleus NGC 3226 2009, The Astrophysical journal, 691, 431 Binder, B., Markowitz, A., and Rothschild, R.E.

Stellar-Mass Black holes and Their Progenitors 2009, Astro2010:The Astronomy and Astrophysics Decadal Survey, Science White Papers, no. 207 Miller, J., Uttley, Nandra, Barrett, Paerels, Mendez, Diaz, Cappi, Kitamoto, Nowak, Wilms, Rothschild, Smith, Weisskopf, Teraschima, and Ueda

--- 2008 ---

Deviations from the Flux-Recurrence Time Relationship in GS 1826--238: Potential Transient Spectral Changes 2008, The Astrophysical Journal, 681, 506 Thompson, T.W.J., Galloway, D.K., Rothschild, R.E., and Homer, L.

Pulse Phase-Resolved Analysis of the High Mass X-Ray Binary Centaurus X-3 over Two Binary Orbits 2008, The Astrophysical Journal, 675, 1487 Suchy, Slawomir, Pottschmidt, Katja, Wilms, Joern, Kreykenbohm, Ingo, Schoenherr, Gabriele, Kretschmar, Peter, McBride, Vanessa, Caballero, Isabel, Rothschild, Richard E., and Grinberg, Victoria

The Pre-Outburst Flare of the A 0535+26 August/September 2005 Outburst 2008, Astronomy and Astrophysics, 480, 17 Caballero, I., Santangelo, A., Kretschmar, P., Staubert, R., Postnov, K., Klochkov, D., Camero-Arranz, A., Finger, M. H., Kreykenbohm, I., Pottschmidt, K., Rothschild, R. E., Suchy, S., Wilms, J., and Wilson, C. A.

Modelling a Simultaneous Radio/X-ray Flare from Cyg X-1 2008, Proceedings of the VII Microquasar Workshop: Microquasars and Beyond. September 1 - 5, 2008. Foca, Izmir, Turkey. Published online at, p.90 Leventis, K., Markoff, S., Wilms, J., Nowak, M. A., Maitra, D.; Pottschmidt, K., Pooley, G. G., Kreykenbohm, I., and Rothschild, R. E.

Scanning the Egress of Vela X-1 2008, Proceedings of the 7th INTEGRAL Workshop. 8 - 11 September 2008 Copenhagen, Denmark. Online at, p.120 Kretschmar, P., Kreykenbom, I., Wilms, J.; Hanke, M., Stuhlinger, M.; Pollock A. M. T., Staubert, R., Kendziorra, E., Rothschild, R. and Suchy, S.

INTEGRAL and RXTE View of Her X-1: Towards Resolving of the System‚s Puzzles 2008, Proceedings of the 7th INTEGRAL Workshop. 8 - 11 September 2008 Copenhagen, Denmark. Online at, p.112 Klochkov, D., Staubert, R., Postnov, K., Shakura, N., Santangelo, A., Wilms, J., and Rothschild, R.

Positron Propagation and the INTEGRAL/SPI 511 keV Bulge/Disk Ratio 2008, Proceedings of the 7th INTEGRAL Workshop. 8 - 11 September 2008 Copenhagen, Denmark. Online at, p.28 Rothschild, R. E., Higdon, James C., and Lingenfelter, Richard E.