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The Radio Variability of the Gravitational Lens PMN J1838-3427

Citation

Winn, JN and Lovell, JEJ and Bignall, H and Gaensler, BM and Getts, TJ and Kedziora-Chudczer, L and Ojha, R and Reynolds, JE and Tingay, SJ and Tzioumis, T and Wieringa, M, The Radio Variability of the Gravitational Lens PMN J1838-3427, The Astronomical Journal, 128, (6) pp. 2696-2703. ISSN 0004-6256 (2004) [Refereed Article]

DOI: doi:10.1086/425881

Abstract

We present the results of a radio variability study of the gravitational lens PMN J1838-3427. Our motivation was to determine the Hubble constant by measuring the time delay between variations of the two quasar images. We monitored the system for 4 months (approximately 5 times longer than the expected delay) using the Australia Telescope Compact Array at 9 GHz. Although both images were variable on a timescale of a few days, no correlated intrinsic variability could be identified, and therefore no time delay could be measured. Notably, the fractional variation of the fainter image (8%) was greater than that of the brighter image (4%), whereas lensed images of a point source would have the same fractional variation. This effect can be explained, at least in part, as the refractive scintillation of both images due to the turbulent interstellar medium of the Galaxy.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Lovell, JEJ (Dr Jim Lovell)
ID Code:45337
Year Published:2004
Web of Science® Times Cited:6
Deposited By:Physics
Deposited On:2007-07-10
Last Modified:2007-07-10
Downloads:0

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