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  Unbiased cosmological parameter estimation from emission-line surveys with interlopers

Gebhardt, H. S. G., Jeong, D., Awan, H., Bridge, J. S., Ciardullo, R., Farrow, D., et al. (2019). Unbiased cosmological parameter estimation from emission-line surveys with interlopers. The Astrophysical Journal, 876(1): 32. doi:10.3847/1538-4357/ab12d5.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-AFA3-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-AFA4-F
Genre: Journal Article

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 Creators:
Gebhardt, Henry S. Grasshorn, Author
Jeong, Donghui, Author
Awan, Humna, Author
Bridge, Joanna S., Author
Ciardullo, Robin, Author
Farrow, Daniel, Author
Gebhardt, Karl, Author
Hill, Gary J., Author
Komatsu, Eiichiro1, Author              
Molina, Mallory, Author
Paulino-Afonso, Ana, Author
Saito, Shun1, Author              
Schneider, Donald P., Author
Zeimann, Greg, Author
Affiliations:
1Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              

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 Abstract: The galaxy catalogs generated from low-resolution emission-line surveys often contain both foreground and background interlopers due to line misidentification, which can bias the cosmological parameter estimation. In this paper, we present a method for correcting the interloper bias by using the joint analysis of auto- and cross-power spectra of the main and the interloper samples. In particular, we can measure the interloper fractions from the cross-correlation between the interlopers and survey galaxies, because the true cross-correlation must be negligibly small. The estimated interloper fractions, in turn, remove the interloper bias in the cosmological parameter estimation. For example, in the Hobby–Eberly Telescope Dark Energy Experiment low-redshift (z < 0.5) [O ii] λ3727Å emitters contaminate high-redshift (1.9 < z < 3.5) Lyα line emitters. We demonstrate that the joint-analysis method yields a high signal-to-noise ratio measurement of the interloper fractions while only marginally increasing the uncertainties in the cosmological parameters relative to the case without interlopers. We also show that the same is true for the high-latitude spectroscopic survey of the Wide-field Infrared Survey Telescope mission where contamination occurs between the Balmer-α line emitters at lower redshifts (1.1 < z < 1.9) and oxygen ([O iii] λ5007Å) line emitters at higher redshifts (1.7 < z < 2.8).

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 Dates: 2019-04-30
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab12d5
Other: LOCALID: 3060324
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol, England : IOP Publishing LTD
Pages: - Volume / Issue: 876 (1) Sequence Number: 32 Start / End Page: - Identifier: ISSN: 1538-4357
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3