A radio-microlensing caustic crossing in B1600+434?

LE Koopmans*, AG de Bruyn, J Wambsganss, CD Fassnacht

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

First, we review the current status of the detection of strong "external" variability in the CLASS gravitational lens B1600+434, focusing on the 1998 VLA 8.5-GHz and 1998/9 WSRT multi-frequency observations. We show that these data can best be explained in terms of radio-microlensing. We then proceed to show some preliminary results from our new multi-frequency VLA monitoring program, in particular the detection of a strong feature (similar to30%) in the light curve of the lensed image which passes predominantly through the dark-matter halo of the lens galaxy. We tentatively interpret this event, which lasted for several weeks, as a radio-microlensing caustic crossing, i.e. the superluminal motion of a muas-scale jet-component in the lensed source over a single caustic in the magnification pattern, that has been created by massive compact objects along the line-of-sight to the lensed image.

Original languageEnglish
Title of host publicationMICROLENSING 2000: A NEW ERA OF MICROLENSING ASTROPHYSICS
EditorsJW Menzies, PD Sackett
Place of PublicationSAN FRANCISCO
PublisherASTRONOMICAL SOC PACIFIC
Pages363-371
Number of pages9
ISBN (Print)1-58381-076-5
Publication statusPublished - 2001
EventMeeting on a New Era in Microlensing Astrophysics - , South Africa
Duration: 21-Feb-200025-Feb-2000

Publication series

NameASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES
PublisherASTRONOMICAL SOC PACIFIC
Volume239

Other

OtherMeeting on a New Era in Microlensing Astrophysics
CountrySouth Africa
Period21/02/200025/02/2000

Keywords

  • GRAVITATIONAL LENS B1600+434
  • TIME-DELAY
  • SYSTEM

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