The Radio Variability of the Gravitational Lens PMN J1838−3427

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dc.contributor.authorWinn, Joshua N.
dc.contributor.authorLovell, James E. J.
dc.contributor.authorBignall, Hayley
dc.contributor.authorGaensler, Bryan M.
dc.contributor.authorGetts, Tracy J.
dc.contributor.authorKedziora-Chudczer, Lucyna
dc.contributor.authorOjha, Roopesh
dc.contributor.authorReynolds, John E.
dc.contributor.authorTingay, Steven J.
dc.contributor.authorTzioumis, Tasso
dc.date.accessioned2020-05-07T16:38:51Z
dc.date.available2020-05-07T16:38:51Z
dc.date.issued2004-12-01
dc.description.abstractWe 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.en_US
dc.description.sponsorshipWe are grateful to Ramesh Narayan for helpful discussions regarding scintillation, Vince McIntyre and Robin Wark for assistance with the ATCA observations, and Barry Clark for allocating ad hoc VLA time for supporting observations. This work was supported by the NSF under grant 0104347.en_US
dc.description.urihttps://iopscience.iop.org/article/10.1086/425881en_US
dc.format.extent8 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2xypg-al2c
dc.identifier.citationJoshua N. Winn et al.,The Radio Variability of the Gravitational Lens PMN J1838−3427,The Astronomical Journal, Volume 128, Number 6, https://doi.org/10.1086%2F425881en_US
dc.identifier.urihttps://doi.org/10.1086%2F425881
dc.identifier.urihttp://hdl.handle.net/11603/18499
dc.identifier.urihttp://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2004AJ....128.2696W
dc.identifier.urihttps://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Search&refcode=2004AJ....128.2696W
dc.language.isoen_USen_US
dc.publisherIOPen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rights© 2004. The American Astronomical Society. All rights reserved.
dc.titleThe Radio Variability of the Gravitational Lens PMN J1838−3427en_US
dc.typeTexten_US

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