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arXiv:astro-ph/9608023 (astro-ph)
[Submitted on 5 Aug 1996]

Title:Interstellar Broadening of Images in the Gravitational Lens PKS 1830-211

Authors:D.L. Jones (1), R.A. Preston (1), D.W. Murphy (1), D.L. Jauncey (2), J.E. Reynolds (2), A.K. Tzioumis (2), E.A. King (2), P.M. McCulloch (3), J.E.J. Lovell (3), M.E. Costa (3), T.D. van Ommen (4) ((1) JPL, Caltech, Pasadena, CA, USA, (2) ATNF, CSIRO, Epping, NSW, Australia, (3) Physics Dept., University of Tasmania, Hobart, Tasmania, Australia, (4) Antarctic CRC, University of Tasmania, Hobart, Tasmania, Australia)
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Abstract: The 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 10E10 K, 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 10E11 K, and the deconvolved size of the core in the southwest compact component is proportional to the wavelength squared between 1.3 cm (22 GHz) and 18 cm (1.7 GHz). VLBI observations at still higher frequencies should be unaffected by interstellar scattering.
Comments: Accepted by Ap.J. (Letters). Paper includes three postscript figures
Subjects: Astrophysics (astro-ph)
Report number: JPL 96-008
Cite as: arXiv:astro-ph/9608023
  (or arXiv:astro-ph/9608023v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/9608023
Journal reference: Astrophys.J.470:L23,1996
Related DOI: https://doi.org/10.1086/310292

Submission history

From: Dayton Jones [view email]
[v1] Mon, 5 Aug 1996 18:33:31 UTC (14 KB)
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