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Your search keyword '"Wenzl, Lukas"' showing total 5 results
Start Over Author "Wenzl, Lukas" Journal monthly notices of the royal astronomical society
5 results on '"Wenzl, Lukas"'

2. Magnification bias estimators for realistic surveys: an application to the BOSS survey.

Author

Wenzl, Lukas, Chen, Shi-Fan, and Bean, Rachel

Subjects
*FINITE differences, *LARGE scale structure (Astronomy), *GALAXY clusters
Abstract

In addition to the intrinsic clustering of galaxies themselves, the spatial distribution of galaxies observed in surveys is modulated by the presence of weak lensing due to matter in the foreground. This effect, known as magnification bias, is a significant contaminant to analyses of galaxy-lensing cross-correlations and must be carefully modelled. We present a method to estimate the magnification bias in spectroscopically confirmed galaxy samples based on finite differences of galaxy catalogues while marginalizing over errors due to finite step size. We use our estimator to measure the magnification biases of the CMASS and LOWZ samples in the SDSS BOSS galaxy survey, analytically taking into account the dependence on galaxy shape for fibre and PSF magnitudes, finding αCMASS = 2.71 ± 0.02 and αLOWZ = 2.45 ± 0.02 and quantify modelling uncertainties in these measurements. Finally, we quantify the redshift evolution of the magnification bias within the CMASS and LOWZ samples, finding a difference of up to a factor of three between the lower and upper redshift bounds for the former. We discuss how to account for this evolution in modelling and its interaction with commonly applied redshift-dependent weights. Our method should be readily applicable to upcoming surveys and we make our code publicly available as part of this work. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Cosmology with the Roman Space Telescope – multiprobe strategies

Author

Eifler, Tim, primary, Miyatake, Hironao, additional, Krause, Elisabeth, additional, Heinrich, Chen, additional, Miranda, Vivian, additional, Hirata, Christopher, additional, Xu, Jiachuan, additional, Hemmati, Shoubaneh, additional, Simet, Melanie, additional, Capak, Peter, additional, Choi, Ami, additional, Doré, Olivier, additional, Doux, Cyrille, additional, Fang, Xiao, additional, Hounsell, Rebekah, additional, Huff, Eric, additional, Huang, Hung-Jin, additional, Jarvis, Mike, additional, Kruk, Jeffrey, additional, Masters, Dan, additional, Rozo, Eduardo, additional, Scolnic, Dan, additional, Spergel, David N, additional, Troxel, Michael, additional, von der Linden, Anja, additional, Wang, Yun, additional, Weinberg, David H, additional, Wenzl, Lukas, additional, and Wu, Hao-Yi, additional

Published
2021
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5. Cosmology with the Roman Space Telescope: synergies with the Rubin Observatory Legacy Survey of Space and Time

Author

Eifler, Tim, primary, Simet, Melanie, additional, Krause, Elisabeth, additional, Hirata, Christopher, additional, Huang, Hung-Jin, additional, Fang, Xiao, additional, Miranda, Vivian, additional, Mandelbaum, Rachel, additional, Doux, Cyrille, additional, Heinrich, Chen, additional, Huff, Eric, additional, Miyatake, Hironao, additional, Hemmati, Shoubaneh, additional, Xu, Jiachuan, additional, Rogozenski, Paul, additional, Capak, Peter, additional, Choi, Ami, additional, Doré, Olivier, additional, Jain, Bhuvnesh, additional, Jarvis, Mike, additional, Kruk, Jeffrey, additional, MacCrann, Niall, additional, Masters, Dan, additional, Rozo, Eduardo, additional, Spergel, David N, additional, Troxel, Michael, additional, von der Linden, Anja, additional, Wang, Yun, additional, Weinberg, David H, additional, Wenzl, Lukas, additional, and Wu, Hao-Yi, additional

Published
2021
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