Studies of Cygnus A and Hercules A
{'Code': '03020400', 'Directorate': {'LongName': 'Direct For Mathematical & Physical Scien'}, 'Division': {'LongName': 'Division Of Astronomical Sciences'}}
{'SignBlockName': 'Pol C. Delosreyes'}
The data from observations of two important radio galaxies, Cygnus              A and Hercules A will be analyzed and interpreted.  The study of                Cygnus A is expected to improve our knowledge of properties of                  jets in powerful radio galaxies, to improve our understanding of                the processes at work in the hotspots, to define the properties of              the newly discovered filamentary structures inside the lobes, and               to characterize the radio spectrum as a function of position.  In               contrast to the case of Cygnus A, which seems to be readily                     understandable in terms of current notions of radio source                      structure, Hercules A presents many puzzles.  The study will aim                particularly at elucidating the system of "puffs" that appear to                emanate from one side of this galaxy.  These studies will be                    relevant to many issues in the theory of extragalactic radio                    source structure, including confinement and beaming in high                     luminosity jets, flow conditions at the jet working surface,                    source energetics, and source ages.
{'FirstName': 'John', 'LastName': 'Dreher', 'EmailAddress': None, 'StartDate': '09/15/1987', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'Massachusetts Institute of Technology', 'CityName': 'Cambridge', 'ZipCode': '021394301', 'PhoneNumber': '6172531000', 'StreetAddress': '77 MASSACHUSETTS AVE', 'CountryName': 'United States', 'StateName': 'Massachusetts', 'StateCode': 'MA'}
[{'Code': '1217', 'Text': 'EXTRAGALACTIC ASTRON & COSMOLO'}, {'Code': '4650', 'Text': 'RADIO SPECTRUM MANAGEMENT'}]
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1987&All=true', 'xml': '8703525.xml'}