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Interstellar Broadening of Images in the Gravitational Lens Pks 1830-211The remarkably strong radio gravitational lens PKS 1830-211 consists of a one arcsecond diameter Einstein ring with two bright compact (milliarcsecond) components located on opposite sides of the ring. We have obtained 22 GHz VLBA data on this source to determine the intrinsic angular sizes of the compact components. Previous VLBI observations at lower frequencies indicate that the brightness temperatures of these components are significantly lower than 10(exp 10) K (Jauncey, et al. 1991), less than is typical for compact synchrotron radio sources and less than is implied by the short timescales of flux density variations. A possible explanation is that interstellar scattering is broadening the apparent angular size of the source and thereby reducing the observed brightness temperature. Our VLBA data support this hypothesis. At 22 GHz the measured brightness temperature is at least 10(exp 11) K, and the deconvolved 2 size of the core in the southwest compact component is proportional to upsilon(sup -2) between 1.7 and 22 GHz. VLBI observations at still higher frequencies should be unaffected by interstellar scattering.
Document ID
19990098020
Acquisition Source
Jet Propulsion Laboratory
Document Type
Other
Authors
Jones, D. L.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Preston, R. A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Murphy, D. W.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Jauncey, D. L.
(Australia Telescope National Facility Epping, Australia)
Reynolds, J. E.
(Australia Telescope National Facility Epping, Australia)
Tzioumis, A. K.
(Australia Telescope National Facility Epping, Australia)
King, E. A.
(Australia Telescope National Facility Epping, Australia)
McCulloch, P. M.
(Tasmania Univ. Hobart, Australia)
Lovell, J. E. J.
(Tasmania Univ. Hobart, Australia)
Costa, M. E.
(Tasmania Univ. Hobart, Australia)
Date Acquired
August 19, 2013
Publication Date
August 1, 1996
Subject Category
Astrophysics
Report/Patent Number
JPL ASTROPHYSICS PREPRINT-96-008
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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