Infrared and visible photometry of the gravitational lens systems 2237 + 030
| Autor: | W. J. Forrest, D. Nadeau, Z. Ninkov, J. D. Garnett, H. K. C. Yee, Judy Pipher |
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| Rok vydání: | 1991 |
| Předmět: |
Physics
Infrared Extinction (astronomy) Astronomy Astronomy and Astrophysics Quasar Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Light curve Gravitational microlensing Galaxy Photometry (optics) Gravitational lens Space and Planetary Science Astrophysics::Earth and Planetary Astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | The Astrophysical Journal. 376:430 |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1086/170292 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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