Ralph Baldwin Professor of Astronomy (Emeritus)
haller@umich.edu
Office Information:
University of Michigan
Department of Astronomy
1085 S. University
Ann Arbor, MI 48109
phone: 734.764.3466
Cosmology, Extragalactic & Galactic;
Extreme Astrophysics;
Astronomy
About
Radio emission from AGNs
Hugh D. Aller studies the properties of radiation from relativistic jets launched by massive black holes in distant galaxies. In particular, he studies those in which the jets are aimed at us - often called "blazars" - in the radio band. This research has used long-term monitoring observations of the total flux density, linear polarization, and circular polarization at three frequencies in the centimeter band obtained with the University of Michigan 26-m telescope (UMRAO). The monitoring efforts -- led by Hugh -- have followed hundreds of sources over several decades. The variations observed in the radio emission from these jets have permitted constraints to be placed on the physical conditions near to the black holes. This research program is done in collaboration with MOJAVE, a VLBA key program dedicated to characterizing the nature of these relativistic jets.
Related Interests
Jets, superluminal behavior, radio instrumentation.
Publications
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