MultiFrequency Observations of the Gravitational Lens B2016 112

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Multi-Frequency Observations of the Gravitational
Lens B2016112

• Anupreeta More
• Max-Planck-Institut fuer Radioastronomie, Bonn
• Supervisor Richard Porcas (MPIfR)
• Collaborator Mike Garrett (JIVE)

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Outline

• Introduction
• Background
• Koopmans scenario
• VLBI Observations
• 18cm, 6cm and 3.6cm
• Results
• Summary

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B2016112
Courtsey CASTLES website
MERLIN map at 6cm
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Koopmans Scenario

• C is a pair of images of a part of the background
  source
• C has a high magnification 300

double
quad
Host galaxy of background source
caustic
D
Radio Optical
Koopmans et al. (2002)
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My Work

• Spectral Analysis of Image A , Image B and
• Region C with the help of --
• GLOBAL VLBI observations at 18cm and 6cm
• HSA observations at 3.6cm
• To look for any counterparts of Region C
  components in Images A and B which will confirm
  Koopmans Scenario

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A
B

• 18cm 6cm 3.6 cm

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C
18 cm
6 cm
3.6 cm
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Spectra of components in Image A
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Spectra of components in Region C
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Comparing spectra of a2a5 and C
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Summary

• High resolution maps reveal more subcomponents in
  Images A and B demonstrating the expected
  opposite parity
• Similarity in the spectra of C with the
  north-west sub-components in A and B are
  consistent with the Koopmans scenario