OF ROGER HILDEBRAND
Photos taken in September, 2003, when family gathered in
Portland, Oregon for the Virginia Douglas Memorial Services.
Pictures from the Family Reunion at Nags Head, N.C.,
Jane and Sister Carol at Bloedel Reserve, Washington,
PETER H. & NANCY (
EMILY S. (HILDEBRAND) & MITCH LEVESGVE (sp)
LESLIE & ALICE L.
JAMES R. & KATHRYN
J. (HILDEBRAND) RICHARDSON
(GEORGE) JAMES R.
DANIEL M. & DEBORAH
ON THIS PAGE: John E.
Carlstrom | Juan I. Collar | Corbin
E. Covault | James W. Cronin | Roger
H. Hildebrand | Stephan Meyer | Dietrich
Müller | Simon P. Swordy | Bruce
The University of Chicago is a major center for
interdisciplinary research in experimental astrophysics
and cosmology. Members of the Department
of Physics work in close collaboration with members of
the the Department of
Astronomy and Astrophysics. Research in experimental
astrophysics is organized under the Enrico
Fermi Institute. Groups that are involved in
experimental astrophysics research include members of the Laboratory
for Space Research (LASR) and the High
Energy Physics group. Members of the department are
active in several different areas including
- Studies of the cosmic microwave background radiation
spectrum and anisotropy,
- Cosmic dust studies detect polarization in the
far-infrared emission as a probe of magnetic field
- Investigations of solar, magnetospheric, and
- High energy gamma-ray astrophysics,
- Studies of high energy emission from active
galaxies, supernovae, and pulsars, and
- Studies of the origin of cosmic rays from the lowest
to the highest possible energies.
Experimental programs are developing new detectors for
space-based experiments, balloon payloads, and ground
Roger H. Hildebrand
Ph.D., California, Berkeley, 1951.
Samuel K. Allison Distinguished Service Professor
Emeritus, Dept. of Physics, Dept. of Astronomy &
Astrophysics, Enrico Fermi Institute.
Experimental physics, infrared astronomy.
Hildebrand and his students study interstellar magnetic
fields by mean of far-infrared polarimetry. This technique
has made it possible to observe field configurations
associated with filamentary clouds, rotating clouds,
collapsing clouds, shock fronts, and other interstellar
environments. It has also made it possible determine the
ratio of uniform to turbulent components of the field and
to show that this ratio remains approximately constant
from dense molecular clouds to the diffuse interstellar
Observations with the University of Chicago polarimeter,
Hertz, at the Caltech
Submillimeter Observatory have led to a wholly
unexpected discovery. Comparison of results at 350 µm
with earlier results at 60 µm and 100 µm from the U. of
C. polarimeter, Stokes, on the Kuiper
Airborne Observatory and with recent results from the James
Clerk Maxwell Observatory have shown that the degree
of polarization depends strongly on the wavelength. From
these results we infer that the cloud medium must be
heterogeneous. There must be domains at different
temperatures with dust grains of different polarizing
The results on the polarization spectrum and on field
configurations are providing a basis for estimating the
interference of Galactic dust emission on measurements of
the polarized component of the cosmic microwave
To extend these investigations, Hildebrand and his
students are working on the design of a polarimeter for
NASA's new airborne Stratospheric Observatory for Infrared
|Submillimeter Array Polarimetry with Hertz. C.D.
Dowell, R.H. Hildebrand, D.A. Schleuning, J.L. Dotson,
G. Novak, T. Renbarger, M. Houde. Ap. J.
504, 588, 1998.
|The Far-Infrared Polarization Spectrum: First
Results and Analysis. R.H. Hildebrand, J.L. Dotson,
C.D. Dowell, D.A. Schleuning, J.E. Vaillancourt. Ap.
J. 516, 834, 1999.
|Summary of Results from Far-Infrared Polarimetry.
J.L. Dotson, C.D. Dowell, D.A.Schleuning, R.H.
Hildebrand. Ap.J.S. 128, 335, 2000.
|Submillimeter Polarimetric Observations of the
Galactic Center. G. Novak, J.L. Dotson, C.D. Dowell,
R. H.Hildebrand, T. Renbarger, D.A. Schleuning. Ap.
J. 529, 241, 2000.
|A Primer on Far-Infrared Polarimetry. R.H.
Hildebrand, J.A. Davidson, J.L.Dotson, C.D. Dowell, G.
Novak, and J.E. Vaillancourt. Submitted to PASP
|Interstellar Magnetic Fields and Infrared-Submillimeter
Polarimetry. R.H. Hildebrand. In Astrophysical
Spectropolarimetry, ed. J. Trujillo, Cambridge
University Press, 2001.|