Milliarcsecond Structure of the Radio Source 2016+112.

Details Milliarcsecond Structure of the Radio Source 2016+112. Milliarcsecond Structure of the Radio Source 2016+112.

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt........76h&link_type=abstract

Thesis (PH.D.)--MASSACHUSETTS INSTITUTE OF TECHNOLOGY, 1990.Source: Dissertation Abstracts International, Volume: 52-05, Secti

Computer Science

Scientific paper

Two 18 cm Mark-III VLBI observations of the 2016+112 gravitational lens system indicate that A and B have structure at the milliarcsecond level. Neither A nor B can be described with only one component. The detailed brightness distributions for A and B are not uniquely determined, however, due to sparse sampling and low signal-to-noise ratios. Many models are considered. One hypothesis consistent with all of the models is that images A and B are not related by linear magnification because the source is evolving on a time scale comparable to or shorter than the time delay between images. Models not required to be consistent with linear magnification were not. Models required to be consistent with linear magnification either fit the data significantly worse or indicated significantly different matrices for the two epochs. The lens is a large structure consisting of at least two galaxies so it is unlikely that the magnification matrix would change significantly in the five and a half years between observational epochs. Any given model shows evidence for source evolution between epochs but the details of that source evolution are highly model dependent. More definite conclusions could be made if the brightness distributions of A and B could be derived without ambiguity. Significantly better sampling with an order of magnitude more data are necessary, along with a better understanding of the error contributions. (Copies available exclusively from MIT Libraries, Rm. 14-0551, Cambridge, MA 02139-4307. Ph. 617 -253-5668; Fax 617-253-1690.).

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