Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt.........7c&link_type=abstract
Thesis (PH.D.)--MASSACHUSETTS INSTITUTE OF TECHNOLOGY, 1995.Source: Dissertation Abstracts International, Volume: 56-06, Secti
Astronomy and Astrophysics
Astrophysics
Hubble Parameter
Scientific paper
MG1131+0456 has been observed extensively with the Very Large Array telescope, and its complex morphology has provided the opportunity for investigating three important astrophysical problems: (1) the mass distribution in the lens galaxy, (2) the structure of the rotation measure distribution in the lens, and (3) the possibility of using the system to constrain the Hubble parameter. We determine the mass distribution of the lens galaxy by modeling the multifrequency VLA images of the system. Among the models we have explored, the profile of the surface mass density of the best lens model contains a substantial core radius and declines asymptotically as r^{-1.2+/-0.2}. The mass inside the lens enclosed by the average ring is very well constrained. If the source is at redshift of 2.0 and the lens is at redshift of 0.5, the mass of the lens enclosed by the ring radius is ~2.0times10 11 solar mass. We develop a new technique to determine the structure of the rotation measure distribution in the lens. We have detected variations in the rotation measure distribution in the lens galaxy of MG1131, and the structure of the variations indicates that the magnetic field in the lens galaxy is likely to change on a scale of { ~}1^{''} . The VLA observations of MG1131+0456 at 8 and 15 GHz taken at several epochs show that the compact components in the system are weakly variable. Results of Monte Carlo simulations show that a time delay should be measurable if approximately 100 observations are obtained. Hence, one should seriously consider MG1131+0456 for measuring the Hubble parameter. (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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