Self-calibration method for II and GI types of intrinsic alignments of galaxies
Abstract
We introduce a self-calibration method that can be applied to the intrinsic ellipticity–intrinsic ellipticity (II) and gravitational shear–intrinsic ellipticity (GI) types of intrinsic alignment of galaxies. The method combines previous self-calibration techniques with modifications to one of them in order to use autospectra in addition to cross-spectra between redshift bins. This allows one to use the self-calibration while preserving all the constraining power of cosmic shear from surveys. We show that the new method provides more flexibility in using various redshift bin widths. We perform cosmological parameter constraint forecast when this method is applied to the Large Synoptic Survey Telescope. Compared to the original self-calibration, we find that the new method provides further significant reduction in any residual shift in the cosmological parameters (e.g. factors of 2-4 for the dark energy equation of state) which is promising for accurate cosmology.
- Authors:
-
- Department of Physics, The University of Texas at Dallas, Dallas, TX 75080, USA, Department of Astronomy, Shanghai Jiao-Tong University, Shanghai 200240, China
- Department of Physics, The University of Texas at Dallas, Dallas, TX 75080, USA
- Department of Physics, Ohio State University, Columbus, OH 43210, USA
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States); Stanford Univ., CA (United States); Univ. of Texas at Dallas, Richardson, TX (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- Contributing Org.:
- LSST Dark Energy Science Collaboration
- OSTI Identifier:
- 1484404
- Alternate Identifier(s):
- OSTI ID: 1543977
- Grant/Contract Number:
- AC02-05CH11231; AC02-76SF00515; SC0019206
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 483 Journal Issue: 1; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics
Citation Formats
Yao, Ji, Ishak, Mustapha, Troxel, M. A., and LSST Dark Energy Science Collaboration. Self-calibration method for II and GI types of intrinsic alignments of galaxies. United Kingdom: N. p., 2018.
Web. doi:10.1093/mnras/sty3188.
Yao, Ji, Ishak, Mustapha, Troxel, M. A., & LSST Dark Energy Science Collaboration. Self-calibration method for II and GI types of intrinsic alignments of galaxies. United Kingdom. https://doi.org/10.1093/mnras/sty3188
Yao, Ji, Ishak, Mustapha, Troxel, M. A., and LSST Dark Energy Science Collaboration. Mon .
"Self-calibration method for II and GI types of intrinsic alignments of galaxies". United Kingdom. https://doi.org/10.1093/mnras/sty3188.
@article{osti_1484404,
title = {Self-calibration method for II and GI types of intrinsic alignments of galaxies},
author = {Yao, Ji and Ishak, Mustapha and Troxel, M. A. and LSST Dark Energy Science Collaboration},
abstractNote = {We introduce a self-calibration method that can be applied to the intrinsic ellipticity–intrinsic ellipticity (II) and gravitational shear–intrinsic ellipticity (GI) types of intrinsic alignment of galaxies. The method combines previous self-calibration techniques with modifications to one of them in order to use autospectra in addition to cross-spectra between redshift bins. This allows one to use the self-calibration while preserving all the constraining power of cosmic shear from surveys. We show that the new method provides more flexibility in using various redshift bin widths. We perform cosmological parameter constraint forecast when this method is applied to the Large Synoptic Survey Telescope. Compared to the original self-calibration, we find that the new method provides further significant reduction in any residual shift in the cosmological parameters (e.g. factors of 2-4 for the dark energy equation of state) which is promising for accurate cosmology.},
doi = {10.1093/mnras/sty3188},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 483,
place = {United Kingdom},
year = {Mon Nov 26 00:00:00 EST 2018},
month = {Mon Nov 26 00:00:00 EST 2018}
}
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https://doi.org/10.1093/mnras/sty3188
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Cited by: 7 works
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