Multi-Frequency Observations of the Gravitational Lens B2016+112

Anupreeta MoreMax-Planck-Institut fuer Radioastronomie, Bonn

Supervisor : Richard Porcas (MPIfR)Collaborator: Mike Garrett (JIVE)

Outline

Introduction Background Koopmans scenario

VLBI Observations 18cm, 6cm and 3.6cm Results

Summary

B2016+112

MERLIN map at 6cm

D (z=1.01)

Courtsey: CASTLES website

A

B

C

~ 3.4 arcsec

Sourcez = 3.27

Koopmans Scenario

C is a pair of images of a part of the background source

C has a high magnification ~ 300

Koopmans et al. (2002)

Radio Optical

double quad

Host galaxy of backgroundsourcecaustic D

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

18cm 6cm 3.6 cm

A

B

a1a2

a5

a3a4

b4 b1

b5

b2

b310 mas

10 mas

C

18 cm

3.6 cm

6 cm

C1-1 C1-2 C2-2 C2-1

50 mas

Spectra of components in Image A

Frequency (GHz)

Spectra of components in Region C

Comparing spectra of a2+a5 and C

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