Present PositionStaff Scientist, X-Ray Astrophysics LaboratoryBrief BioRichard Kelley has worked on observational high-energy astrophysics since 1977. This started out with measuring the properties of binary X-ray pulsars, including discovering three new X-ray pulsars. He subsequently contributed to or participated in almost every x-ray observatory since coming to Goddard in 1983 as an NRC Research Associate. Soon after arriving at Goddard he began working on the development of x-ray microcalorimeters, a year after the pioneering work was underway. Since that time he has contributed to the steady improvement in energy resolution from ~ 140 eV to 3.2 eV and the development of these devices into state of the art arrays. This sensor technology has been used on a sounding rocket payload in collaboration with the University of Wisconsin to measure the spectrum of the low energy x-ray background and especially on the high resolution X-Ray Spectrometer (XRS) developed for the Suzaku (originally Astro-E2) X-Ray Observatory. This is the first orbiting platform to use these devices. He also helped develop a laboratory x-ray microcalorimeter spectrometer that is being used for atomic physics measurements. He has been responsible for helping to guide the microcalorimeter technology for the Constallation-X Observatory.Educational BackgroundPh.D, physics - Massachusetts Institute of Technology, June 1982B.A., physics (high honors) - Rutgers University, June 1977 Research InterestsX-ray astrophysics.Non-dispersive x-ray spectroscopy using low temperature microcalorimeters. Current ProjectsPrincipal Investigator for US participation in the Astro-E2 x-ray astrophysics observatoryIntegrated Product Team Leader for the development of microcalorimeters for the Constellation-X mission Co-Investigator on the GSFC/Wisconsin XQC X-Ray Microcalorimeter sounding rocket program to study the soft diffuse x-ray background Co-Investigator NASA ROSS program for development of High Throughput X-Ray Spectroscopy Co-Investigator NASA ROSS program for development of Laboratory Astrophysics Selected PublicationsLaboratory Simulation of Charge Exchange-produced X-Ray Emission From CometsBeiersdorfer, P., Boyce, K.R., Brown, G.V., Chen, H., Kahn, S.M., Kelley, R.L., May, M., Olson, R.E., Porter, F.S., Stahle, C.K., Tillotson, W.A., Science, 2003, Vol 300, Iss 5625, pp 1558-1559. Laboratory Measurements of the Relative Intensity of the 3s->2p and 3d->2p Transitions in Fe XVII Beiersdorfer, P. Behar, E., Boyce, K.R., Brown, G.V., Chen, H., Gendreau. K.C., Gu, M.F., Gygax, J., Kahn, S.M., Kelley, R.L., Porter, F.S., Stahle, C.K., Szymkowiak, A.E., Astrophysical Journal, 2002, Vol. 576, Iss 2, pp L169-L172. A High Spectral Resolution Observation of the Soft X-Ray Diffuse Background With Thermal Detectors McCammon, D., Almy, R., Apodaca, E., Tiest, W.B., Cui, W., Deiker, S., Galeazzi, M., Juda, M., Lesser, A., Mihara, T., Morgenthaler, J.P., Sanders, W.T., Zhang, J., Figueroa-Feliciano, E., Kelley, R.L., Moseley, S.H., Mushotzky, R.F., Porter, F.S., Stahle, C.K., Szymkowiak, A.E., Astrophysical Journal, 2002, Vol. 576, Iss 1, pp 188-203 The Microcalorimeter Spectrometer on the ASTRO-E X-Ray Observatory R.L. Kelley, M.D. Audley, K.R. Boyce, R. Fujimoto, K.C. Gendreau, Y. Ishisaki, D. McCammon, T. Mihara, K. Mitsuda, S.H. Moseley, D.B. Mott, F.S. Porter, C.K. Stahle, and A.E. Szymkowiak, 2000, Nucl. Inst. and Meth. A 444, 170 The XRS System - The First Cryogenic X-Ray Detector in Orbit K. Mitsuda and R. Kelley 1999, Nucl. Inst. and Meth. A 436, 212
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