Lynn & Ella Beedle
Carol & Don Healy
Virginia & Page Douglas
Jane & Roger Hildebrand
John & Virginia Beedle
Dick & Dorothy Beedle








Jane & Roger Hildebrand


                      Jane and Roger.jpg (95050 bytes)     House on Kimbark.jpg (90476 bytes)     Roger earlier.jpg (42283 bytes)


                                            RECOLLECTIONS OF ROGER HILDEBRAND



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                               SL Simpson gs Jane Roger Marilyn Don Carol Sm.JPG (170822 bytes)       

                              Photos taken in September, 2003, when family gathered in

                                                  Portland, Oregon for the Virginia Douglas Memorial Services.




                                              Jane Roger at Hattaras SM.JPG (93245 bytes)

              DickJaneCarLyn SM.JPG (69808 bytes)  Dick Lynn Jane Mom SM.JPG (114784 bytes)  JoyRogJanMarCarolLiz Jockeys Ridge SM.JPG (70918 bytes) Roger and Jane SM.JPG (77603 bytes)

                        Pictures from the Family Reunion at Nags Head, N.C., June 2003.



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  Jane and Sister Carol at Bloedel Reserve, Washington, 2001.




        VANESSA M.




        JOANNA L.


        (GEORGE) JAMES R.

        MAXWELL R.


        BENJAMIN J.

        SARAH J.



                                                     Wedding Announcement



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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 D. Winstein

Experimental Astrophysics

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

  1. Studies of the cosmic microwave background radiation spectrum and anisotropy,
  2. Cosmic dust studies detect polarization in the far-infrared emission as a probe of magnetic field structure,
  3. Investigations of solar, magnetospheric, and heliospheric phenomena,
  4. High energy gamma-ray astrophysics,
  5. Studies of high energy emission from active galaxies, supernovae, and pulsars, and
  6. 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 based systems.

Hildebrand picture 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 medium.

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 power.

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 background.

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 Astronomy (SOFIA).

bulletSubmillimeter 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.
bulletThe 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.
bulletSummary of Results from Far-Infrared Polarimetry. J.L. Dotson, C.D. Dowell, D.A.Schleuning, R.H. Hildebrand. Ap.J.S. 128, 335, 2000.
bulletSubmillimeter 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.
bulletA 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 (2000).
bulletInterstellar Magnetic Fields and Infrared-Submillimeter Polarimetry. R.H. Hildebrand. In Astrophysical Spectropolarimetry, ed. J. Trujillo, Cambridge University Press, 2001.
updated 4/2001