Infrared and visible photometry of the gravitational lens systems 2237 + 030

Show simple item record Nadeau, Daniel en_US Yee, Howard en_US Forrest, William en_US Garnett, James en_US Ninkov, Zoran en_US Pipher, Judith en_US 2006-12-18T17:33:22Z en_US 2006-12-18T17:33:22Z en_US 1991-08-01 en_US
dc.identifier.citation Astrophysical Journal 376N2 (1991) 430-438 en_US
dc.identifier.issn 1538-4365 en_US
dc.identifier.uri en_US
dc.description This article may also be accessed on the publisher's website at: en_US
dc.description.abstract As part of a program of high spatial resolution imaging of gravitationally lensed sources in the visible and IR, images of 2237 + 030 were obtained in the Gunn r and infrared J, H, K, and 3.3 micron filters. The results of the photometry of the four bright quasar components provide evidence of extinction through the lens and a determination of the extinction law in the galaxy is made. The energy distribution shows evidence of a sharp decrease of the spectral index at wavelengths longer than a rest wavelength of 1 micron. Assuming that microlensing amplification in the IR is of similar strength as in the visible, the data constrain the suggested microlensing event of August-September 1988 to a time scale of 100 days. en_US
dc.description.sponsorship The authors would like to thank the staff of the Canada-France-Hawaii Telescope, in particular Bill Cruise, Ken Barton, and John Hamilton, for their assistance with the observations. The infrared observations would not have been possible without the strong support of the director, Robert McLaren, whome we gratefully thank. We also thank H. Grondines and M. Riopel for help with the data reduction, and M. Langlois for the artwork. D.N. and H.C.K.Y. are supported through the Natural Science and Engineering Research Council by University Research Fellowships and operating grants. W.J.F., J.D.G., Z.N., and J.L.P. were supported by grants from the NSF, NASA-Ames, the National Geographic Society, and NASA. en_US
dc.format.extent 1663016 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher The University of Chicago Press en_US
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dc.relation.ispartofseries vol. 376 en_US
dc.relation.ispartofseries no. 2 en_US
dc.subject Gravitational lenses en_US
dc.subject Infrared photometry en_US
dc.subject Interstellar matter en_US
dc.subject Quasars en_US
dc.subject Visible spectrum en_US
dc.title Infrared and visible photometry of the gravitational lens systems 2237 + 030 en_US
dc.type Article en_US

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