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Title: Effects of [NII] and H α line blending on the WFIRST Galaxy redshift survey

Abstract

The Wide Field Infrared Survey Telescope ( WFIRST) will conduct a galaxy redshift survey using the H α emission line primarily for spectroscopic redshift determination. Due to the modest spectroscopic resolution of the grism, the H α and the neighbouring [NII] lines are blended, leading to a redshift bias that depends on the [NII]/H α ratio, which is correlated with a galaxy’s metallicity, hence mass and ultimately environment. Furthermore, we investigate how this bias propagates into the galaxy clustering and cosmological parameters obtained from the WFIRST. Using simulation, we explore the effect of line blending on redshift-space distortion and baryon acoustic oscillation (BAO) measurements.

Authors:
 [1]; ORCiD logo [2];  [1];  [3];  [1];  [4];  [5]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. The Ohio State Univ., Columbus, OH (United States); Univ. of Arizona, Tucson, AZ (United States)
  3. Stanford Univ., Stanford, CA (United States)
  4. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. California Inst. of Technology (CalTech), Pasadena, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1495501
Alternate Identifier(s):
OSTI ID: 1528884
Grant/Contract Number:  
AC02-76SF00515; NNG16PJ25C
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 485; Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; line: identification; surveys; cosmology: observations

Citation Formats

Martens, Daniel, Fang, Xiao, Troxel, M. A., DeRose, Joe, Hirata, Christopher M., Wechsler, Risa H., and Wang, Yun. Effects of [NII] and H α line blending on the WFIRST Galaxy redshift survey. United States: N. p., 2019. Web. doi:10.1093/mnras/stz391.
Martens, Daniel, Fang, Xiao, Troxel, M. A., DeRose, Joe, Hirata, Christopher M., Wechsler, Risa H., & Wang, Yun. Effects of [NII] and H α line blending on the WFIRST Galaxy redshift survey. United States. doi:10.1093/mnras/stz391.
Martens, Daniel, Fang, Xiao, Troxel, M. A., DeRose, Joe, Hirata, Christopher M., Wechsler, Risa H., and Wang, Yun. Fri . "Effects of [NII] and H α line blending on the WFIRST Galaxy redshift survey". United States. doi:10.1093/mnras/stz391.
@article{osti_1495501,
title = {Effects of [NII] and H α line blending on the WFIRST Galaxy redshift survey},
author = {Martens, Daniel and Fang, Xiao and Troxel, M. A. and DeRose, Joe and Hirata, Christopher M. and Wechsler, Risa H. and Wang, Yun},
abstractNote = {The Wide Field Infrared Survey Telescope (WFIRST) will conduct a galaxy redshift survey using the H α emission line primarily for spectroscopic redshift determination. Due to the modest spectroscopic resolution of the grism, the H α and the neighbouring [NII] lines are blended, leading to a redshift bias that depends on the [NII]/H α ratio, which is correlated with a galaxy’s metallicity, hence mass and ultimately environment. Furthermore, we investigate how this bias propagates into the galaxy clustering and cosmological parameters obtained from the WFIRST. Using simulation, we explore the effect of line blending on redshift-space distortion and baryon acoustic oscillation (BAO) measurements.},
doi = {10.1093/mnras/stz391},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 485,
place = {United States},
year = {2019},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1093/mnras/stz391

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