Open AccessDetermination of time delay from the gravitational lens B1422+231
Author(s) -
Patnaik A.R.,
Narasimha D.
Publication year - 2001
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2001.04711.x
Subject(s) - physics , gravitational lens , light curve , lens (geology) , gravitation , optics , astrophysics , astronomy , galaxy , redshift
We present the radio light curves of lensed images of the gravitational lens B1422+231. The observations have been carried out using the VLA at 8.4 and 15 GHz over a period of 197 d. We describe a method to estimate the time delay from the observed light curves. Using this method, our cross‐correlation analysis shows that the time delay between images B and A is 1.5±1.4 d , that between A and C is 7.6±2.5 d , and that between B and C is 8.2±2.0 d . When applied to other lensed systems with measured time delays our new method gives comparable results.