NSF Org:	AST Division Of Astronomical Sciences
Recipient:	THE REGENTS OF THE UNIVERSITY OF COLORADO
Initial Amendment Date:	June 4, 1996
Latest Amendment Date:	June 3, 1998
Award Number:	9529175
Award Instrument:	Continuing Grant
Program Manager:	Susan M. Simkin AST  Division Of Astronomical Sciences MPS  Directorate for Mathematical and Physical Sciences
Start Date:	September 1, 1996
End Date:	August 31, 2000 (Estimated)
Total Intended Award Amount:	$302,574.00
Total Awarded Amount to Date:	$302,574.00
Funds Obligated to Date:	FY 1996 = $100,858.00 FY 1997 = $100,858.00 FY 1998 = $100,858.00
History of Investigator:	Mitchell Begelman (Principal Investigator) mitch@jila.colorado.edu
Recipient Sponsored Research Office:	University of Colorado at Boulder 3100 MARINE ST Boulder CO  US  80309-0001 (303)492-6221
Sponsor Congressional District:	02
Primary Place of Performance:	University of Colorado at Boulder 3100 MARINE ST Boulder CO  US  80309-0001
Primary Place of Performance Congressional District:	02
Unique Entity Identifier (UEI):	SPVKK1RC2MZ3
Parent UEI:
NSF Program(s):	EXTRAGALACTIC ASTRON & COSMOLO
Primary Program Source:	app-0196  app-0197  app-0198
Program Reference Code(s):	0000, 1206, OTHR
Program Element Code(s):	121700
Award Agency Code:	4900
Fund Agency Code:	4900
Assistance Listing Number(s):	47.049

ABSTRACT

AST 95-29175 PI: Mitchell Begelman Theoretical Investigations of Relativistic Jets and Extragalactic Radio Sources Clues to the nature of relativistic jets in extragalactic radio sources--to their speed, composition, and internal energy content--can be obtained by studying how they respond to disturbances. Such disturbances are provided by Nature, in the form of shocks, interactions with the ambient radiation field, and hydrodynamic instabilities. Observations, at all wavelengths from radio to gamma-rays, are now providing detailed information about the morphologies, motions, and radiative properties of these disturbances. This investigation is aimed at relating the physical character of these disturbances to their observational signatures, and determining how the interactions of jets with the gas surrounding it in an evolving cocoon affect the evolution and appearance of extragalactic radio sources. Models will be developed for particle acceleration at relativistic oblique shocks. The effects of radiation drag on the magnetic acceleration of jets, and whether the drag can trigger shocks, will be investigated.

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