On a systematic bias in surface brightness fluctuations based distances due to gravitational microlensing |
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Authors: | A V Tuntsov G F Lewis |
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Institution: | School of Physics, University of Sydney, A29, NSW 2006, Australia |
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Abstract: | The effect of gravitational microlensing on the determination of extragalactic distances using the surface brightness fluctuations (SBF) technique is considered and a method to calculate SBF amplitudes in the presence of microlensing is presented. With a simple approximation for the magnification power spectrum at low optical depth, the correction to the SBF-based luminosity distance is calculated. The results suggest the effect can be safely neglected at present but may become important for SBF-based Hubble diagrams at luminosity distances of about 1 Gpc and beyond. |
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Keywords: | gravitational lensing methods: analytical stars: statistics galaxies: distances and redshifts galaxies: stellar content dark matter |
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