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Title: The triply-ionized carbon forest from eBOSS: cosmological correlations with quasars in SDSS-IV DR14

Abstract

Here, we present measurements of the cross-correlation of the triply-ionized carbon (CIV) forest with quasars using Sloan Digital Sky Survey Data Release 14. The study exploits a large sample of new quasars from the first two years of observations by the Extended Baryon Oscillation Spectroscopic Survey (eBOSS). The CIV forest is a weaker tracer of large-scale structure than the Lyα forest, but benefits from being accessible at redshifts z<2 where the quasar number density from eBOSS is high. Our data sample consists of 287,651 CIV forest quasars in the redshift range 1.4<3.5 and 387,315 tracer quasars with 1.2<3.5. We measure large-scale correlations from CIV absorption occuring in three distinct quasar rest-frame wavelength bands of the spectra referred to as the CIV forest, the SiIV forest and the Lyα forest. From the combined fit to the quasar-CIV cross-correlations for the CIV forest and the SiIV forest, the CIV redshift-space distortion parameter is βCIV=0.27 –0.14 –0.26 +0.16 +0.34 and its combination with the CIV linear transmission bias parameter is bCIV(1+βCIV)=–0.0183 –0.0014 –0.0029 +0.0013 +0.0025 (1σ and 2σ statistical errors) at the mean redshift z=2.00. Splitting the sample at z=2.2 to constrain the bias evolution with redshift yields the power-law exponent γ=0.60±0.63, indicatingmore » a significantly weaker redshift-evolution than for the Lyα forest linear transmission bias. Additionally, we demonstrate that CIV absorption has the potential to be used as a probe of baryon acoustic oscillations (BAO). While the current data set is insufficient for a detection of the BAO peak feature, the final quasar samples for redshifts 1.4<2.2 from eBOSS and the Dark Energy Spectroscopic Instrument (DESI) are expected to provide measurements of the isotropic BAO scale to ~7% and ~3% precision, respectively, at zsime1.6.« less

Authors:
 [1];  [1];  [2];  [3];  [4];  [2];  [5];  [2];  [2];  [3];  [6];  [7];  [1];  [8];  [9]
  1. Aix Marseille Univ., Marseille (France)
  2. Univ. of Utah, Salt Lake City, UT (United States)
  3. Univ. Pierre et Marie Curie Paris 6, Univ. Denis Diderot Paris, Paris Cedex (France)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
  5. Apache Point Observatory, Sunspot, NM (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  7. Univ. of Portsmouth, Portsmouth (United Kingdom)
  8. Univ. Paris-Saclay, Gif-sur-Yvette (France)
  9. The Pennsylvania State Univ., University Park, PA (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1460817
Report Number(s):
BNL-207846-2018-JAAM
Journal ID: ISSN 1475-7516; TRN: US1901920
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2018; Journal Issue: 05; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; baryon acoustic oscillations; cosmological parameters from LSS; dark energy experiments; Lyman alpha forest

Citation Formats

Blomqvist, Michael, Pieri, Matthew M., du Mas des Bourboux, Helion, Busca, Nicolas G., Slosar, Anze, Bautista, Julian E., Brinkmann, Jonathan, Brownstein, Joel R., Dawson, Kyle, Agathe, Victoria de Sainte, Guy, Julien, Percival, Will J., Perez-Rafols, Ignasi, Rich, James, and Schneider, Donald P. The triply-ionized carbon forest from eBOSS: cosmological correlations with quasars in SDSS-IV DR14. United States: N. p., 2018. Web. doi:10.1088/1475-7516/2018/05/029.
Blomqvist, Michael, Pieri, Matthew M., du Mas des Bourboux, Helion, Busca, Nicolas G., Slosar, Anze, Bautista, Julian E., Brinkmann, Jonathan, Brownstein, Joel R., Dawson, Kyle, Agathe, Victoria de Sainte, Guy, Julien, Percival, Will J., Perez-Rafols, Ignasi, Rich, James, & Schneider, Donald P. The triply-ionized carbon forest from eBOSS: cosmological correlations with quasars in SDSS-IV DR14. United States. doi:10.1088/1475-7516/2018/05/029.
Blomqvist, Michael, Pieri, Matthew M., du Mas des Bourboux, Helion, Busca, Nicolas G., Slosar, Anze, Bautista, Julian E., Brinkmann, Jonathan, Brownstein, Joel R., Dawson, Kyle, Agathe, Victoria de Sainte, Guy, Julien, Percival, Will J., Perez-Rafols, Ignasi, Rich, James, and Schneider, Donald P. Tue . "The triply-ionized carbon forest from eBOSS: cosmological correlations with quasars in SDSS-IV DR14". United States. doi:10.1088/1475-7516/2018/05/029. https://www.osti.gov/servlets/purl/1460817.
@article{osti_1460817,
title = {The triply-ionized carbon forest from eBOSS: cosmological correlations with quasars in SDSS-IV DR14},
author = {Blomqvist, Michael and Pieri, Matthew M. and du Mas des Bourboux, Helion and Busca, Nicolas G. and Slosar, Anze and Bautista, Julian E. and Brinkmann, Jonathan and Brownstein, Joel R. and Dawson, Kyle and Agathe, Victoria de Sainte and Guy, Julien and Percival, Will J. and Perez-Rafols, Ignasi and Rich, James and Schneider, Donald P.},
abstractNote = {Here, we present measurements of the cross-correlation of the triply-ionized carbon (CIV) forest with quasars using Sloan Digital Sky Survey Data Release 14. The study exploits a large sample of new quasars from the first two years of observations by the Extended Baryon Oscillation Spectroscopic Survey (eBOSS). The CIV forest is a weaker tracer of large-scale structure than the Lyα forest, but benefits from being accessible at redshifts z<2 where the quasar number density from eBOSS is high. Our data sample consists of 287,651 CIV forest quasars in the redshift range 1.4<3.5 and 387,315 tracer quasars with 1.2<3.5. We measure large-scale correlations from CIV absorption occuring in three distinct quasar rest-frame wavelength bands of the spectra referred to as the CIV forest, the SiIV forest and the Lyα forest. From the combined fit to the quasar-CIV cross-correlations for the CIV forest and the SiIV forest, the CIV redshift-space distortion parameter is βCIV=0.27 –0.14 –0.26 +0.16 +0.34 and its combination with the CIV linear transmission bias parameter is bCIV(1+βCIV)=–0.0183 –0.0014 –0.0029 +0.0013 +0.0025 (1σ and 2σ statistical errors) at the mean redshift z=2.00. Splitting the sample at z=2.2 to constrain the bias evolution with redshift yields the power-law exponent γ=0.60±0.63, indicating a significantly weaker redshift-evolution than for the Lyα forest linear transmission bias. Additionally, we demonstrate that CIV absorption has the potential to be used as a probe of baryon acoustic oscillations (BAO). While the current data set is insufficient for a detection of the BAO peak feature, the final quasar samples for redshifts 1.4<2.2 from eBOSS and the Dark Energy Spectroscopic Instrument (DESI) are expected to provide measurements of the isotropic BAO scale to ~7% and ~3% precision, respectively, at zsime1.6.},
doi = {10.1088/1475-7516/2018/05/029},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 05,
volume = 2018,
place = {United States},
year = {2018},
month = {5}
}

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