After graduate education at the University of California at Berkeley,
Al Kogut came to Goddard in 1989 to work on the Cosmic Background
Explorer. He has remained at the Center in a variety of positions,
and is currently a member of the Laboratory for Cosmology within the Exploration of the Universe Directorate.
Build innovative instruments to measure the cosmic microwave
background and diffuse Galactic foregrounds at wavelengths
from microwaves through the sub-mmilimeter band.
Cosmology: Measurements of the spectrum, anisotropy, and polarization
of the cosmic microwave background radiation (CMB) using ground-based,
balloon, and satellite instruments.
Astrophysics: Measure Galactic far-IR and radio emission as probe of physical conditions in the diffuse interstellar medium.
Microwave Instrumentation: Develop new instrumentation for polarization-sensitive detection of radiation at microwave through sub-mm wavelengths. Design and build compact precision blackbody calibration targets.
Principal Investigator for the Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission (ARCADE). ARCADE is a balloon-borne instrument to measure the spectrum of the cosmic microwave background at frequencies from 3 GHz to 90 GHz (15 cm to 3mm wavelength). It uses a novel open-aperture cryogenic design to achieve mK absolute precision at centimeter wavelengths. Data from ARCADE will determine the epoch of reionization and the development of structure in the early universe. Collaborators include the University of California at Santa Barbara and the Jet Propulsion Laboratory.
Principal Investiogator for the Primordial Anisotropy Polarization Pathfinder Array (PAPPA). PAPPA is a balloon-borne instrument to measure the polarization of the cosmic micorwave background at millimeter wavelengths. It will search for the signature of gravity waves excited in an inflationary epoch shortly after the Big Bang. PAPPA uses a "polarimeter-on-a-chip" to instantaneously measure the Stokes I, Q, and U parameters in each pixel of the array. PAPPA is a collaboration with the University of Pennsylvania and the National Institute of Standards and Technology.
Science Team member for the Wilkinson Microwave Anisotropy Probe (WMAP). WMAP is a deep space probe to measure the spatial anisotropy and polarization of the cosmic microwave background at microwave frequencies (22 to 94 GHz). The WMAP data allow a determination of the basic comsological parameters defining the large-scale structure and contents of the Universe.
Additional projects include several smaller-scale efforts to develop
microwave instrumentation and techniques. Examples include the development of low-power cryogenic phase switches using Micro Electro-Mechanical Systems (MEMS) technologies, development of
high-emissivity paint for passive cooling at cryogenic temperatures,
and development of both free-space and waveguide loads as precision calibration targets.
Ph.D. 1989 (Physics),
University of California at Berkeley
A.B. 1983 (Physics),
Princeton, New Jersey
"An Instrument to Measure the Temperature of the Cosmic Microwave Background Radiation at Centimeter Wavelengths", A. Kogut, D.J. Fixsen, S. Levin, M. Limon, P.M. Lubin, P. Mirel, M. Seiffert, and E. Wollack, The Astrophysical Journal Supplement Series, 154, 493 (2004)
"Wilkinson Microwave Anisotropy Probe (WMAP) First Year Observations:
TE Polarization", A. Kogut, D.N. Spergel, C. Barnes, C.L. Bennett, M. Halpern, G. Hinshaw, N. Jarosik, M. Limon, S.S. Meyer, L. Page, G.S. Tucker, E. Wollack, and E.L. Wright, The Astrophysical Journal Supplement Series, 148, 161 (2003)
"Design and Calibration of a Cryogenic Blackbody Calibrator at Centimeter Wavelengths", A. Kogut, E. Wollack, D.J. Fixsen, M. Limon, P. Mirel, S. Levin, M. Seiffert, and P.M. Lubin, Review of Scientific Instruments, 75, 5079 (2004)
"Constraints on the Topology of the Universe from the WMAP First-Year Sky Maps", N. G. Phillips and A. Kogut, The Astrophysical Journal, in press (2005)