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Title: Prescriptions for Correcting Ultraviolet-based Redshifts for Luminous Quasars at High Redshift

Abstract

High-redshift quasars typically have their redshift determined from rest-frame ultraviolet (UV) emission lines. However, these lines, and more specifically the prominent C IV λ1549 emission line, are typically blueshifted yielding highly uncertain redshift estimates compared to redshifts determined from rest-frame optical emission lines. We present near-infrared spectroscopy of 18 luminous quasars at 2.15 < z < 3.70 that allows us to obtain reliable systemic redshifts for these sources. Together with near-infrared spectroscopy of an archival sample of 44 quasars with comparable luminosities and redshifts, we provide prescriptions for correcting UV-based redshifts. Our prescriptions reduce velocity offsets with respect to the systemic redshifts by ~140 km s-1 and reduce the uncertainty on the UV-based redshift by ~25% with respect to the best method currently used for determining such values. We also find that the redshifts determined from the Sloan Digital Sky Survey Pipeline for our sources suffer from significant uncertainties, which cannot be easily mitigated. In conclusion, we discuss the potential of our prescriptions to improve UV-based redshift corrections given a much larger sample of high-redshift quasars with near-infrared spectra.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [2];  [2]
  1. University of North Texas, Denton, TX (United States)
  2. University of Wyoming, Laramie, WY (United States)
  3. University of Arizona, Tucson, AZ (United States)
Publication Date:
Research Org.:
Univ. of Wyoming, Laramie, WY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
OSTI Identifier:
1668349
Grant/Contract Number:  
SC0019022; AC02-05CH1123; AST-1815281; AST-1815645
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 893; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Galaxies: active; quasars: emission lines; quasars

Citation Formats

Dix, Cooper, Shemmer, Ohad, Brotherton, Michael S., Green, Richard F., Mason, Michelle, and Myers, Adam D.. Prescriptions for Correcting Ultraviolet-based Redshifts for Luminous Quasars at High Redshift. United States: N. p., 2020. Web. https://doi.org/10.3847/1538-4357/ab77b6.
Dix, Cooper, Shemmer, Ohad, Brotherton, Michael S., Green, Richard F., Mason, Michelle, & Myers, Adam D.. Prescriptions for Correcting Ultraviolet-based Redshifts for Luminous Quasars at High Redshift. United States. https://doi.org/10.3847/1538-4357/ab77b6
Dix, Cooper, Shemmer, Ohad, Brotherton, Michael S., Green, Richard F., Mason, Michelle, and Myers, Adam D.. Wed . "Prescriptions for Correcting Ultraviolet-based Redshifts for Luminous Quasars at High Redshift". United States. https://doi.org/10.3847/1538-4357/ab77b6. https://www.osti.gov/servlets/purl/1668349.
@article{osti_1668349,
title = {Prescriptions for Correcting Ultraviolet-based Redshifts for Luminous Quasars at High Redshift},
author = {Dix, Cooper and Shemmer, Ohad and Brotherton, Michael S. and Green, Richard F. and Mason, Michelle and Myers, Adam D.},
abstractNote = {High-redshift quasars typically have their redshift determined from rest-frame ultraviolet (UV) emission lines. However, these lines, and more specifically the prominent C IV λ1549 emission line, are typically blueshifted yielding highly uncertain redshift estimates compared to redshifts determined from rest-frame optical emission lines. We present near-infrared spectroscopy of 18 luminous quasars at 2.15 < z < 3.70 that allows us to obtain reliable systemic redshifts for these sources. Together with near-infrared spectroscopy of an archival sample of 44 quasars with comparable luminosities and redshifts, we provide prescriptions for correcting UV-based redshifts. Our prescriptions reduce velocity offsets with respect to the systemic redshifts by ~140 km s-1 and reduce the uncertainty on the UV-based redshift by ~25% with respect to the best method currently used for determining such values. We also find that the redshifts determined from the Sloan Digital Sky Survey Pipeline for our sources suffer from significant uncertainties, which cannot be easily mitigated. In conclusion, we discuss the potential of our prescriptions to improve UV-based redshift corrections given a much larger sample of high-redshift quasars with near-infrared spectra.},
doi = {10.3847/1538-4357/ab77b6},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 893,
place = {United States},
year = {2020},
month = {4}
}

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Works referenced in this record:

The Sloan Digital Sky Survey: Technical Summary
journal, September 2000

  • York, Donald G.; Adelman, J.; Anderson, Jr., John E.
  • The Astronomical Journal, Vol. 120, Issue 3
  • DOI: 10.1086/301513

The large-scale quasar-Lyman α forest cross-correlation from BOSS
journal, May 2013

  • Font-Ribera, Andreu; Arnau, Eduard; Miralda-Escudé, Jordi
  • Journal of Cosmology and Astroparticle Physics, Vol. 2013, Issue 05
  • DOI: 10.1088/1475-7516/2013/05/018

Composite Quasar Spectra from the Sloan Digital Sky Survey
journal, August 2001

  • Vanden Berk, Daniel E.; Richards, Gordon T.; Bauer, Amanda
  • The Astronomical Journal, Vol. 122, Issue 2
  • DOI: 10.1086/321167

The WISSH quasars project: IV. Broad line region versus kiloparsec-scale winds
journal, September 2018


The Two Micron All Sky Survey (2MASS)
journal, February 2006

  • Skrutskie, M. F.; Cutri, R. M.; Stiening, R.
  • The Astronomical Journal, Vol. 131, Issue 2
  • DOI: 10.1086/498708

CATALOG OF NARROW C IV ABSORPTION LINES IN BOSS. II. FOR QUASARS WITH Z em > 2.4
journal, October 2014

  • Chen, Zhi-Fu; Qin, Yi-Ping; Qin, Ming
  • The Astrophysical Journal Supplement Series, Vol. 215, Issue 1
  • DOI: 10.1088/0067-0049/215/1/12

The emission-line properties of low-redshift quasi-stellar objects
journal, May 1992

  • Boroson, Todd A.; Green, Richard F.
  • The Astrophysical Journal Supplement Series, Vol. 80
  • DOI: 10.1086/191661

Efficient Photometric Selection of Quasars from the Sloan Digital sky Survey. ii. ∼1, 000, 000 Quasars from data Release 6
journal, December 2008

  • Richards, Gordon T.; Myers, Adam D.; Gray, Alexander G.
  • The Astrophysical Journal Supplement Series, Vol. 180, Issue 1
  • DOI: 10.1088/0067-0049/180/1/67

Weak Emission-Line Quasars in the Context of a Modified Baldwin Effect
journal, May 2015


Spectroscopic Redshifts for Seven Lens Galaxies
journal, April 2006

  • Ofek, Eran O.; Maoz, Dan; Rix, Hans‐Walter
  • The Astrophysical Journal, Vol. 641, Issue 1
  • DOI: 10.1086/500403

Spectral Classification and Redshift Measurement for the Sdss-Iii Baryon Oscillation Spectroscopic Survey
journal, October 2012


The Sloan Digital sky Survey Reverberation Mapping Project: Velocity Shifts of Quasar Emission Lines
journal, October 2016


Blueshifted [O iii ] Emission: Indications of a Dynamic Narrow-Line Region
journal, August 2005

  • Boroson, Todd
  • The Astronomical Journal, Vol. 130, Issue 2
  • DOI: 10.1086/431722

Quasar feedback: more bang for your buck
journal, January 2010


The Sloan Digital Sky Survey Quasar Catalog: Fourteenth data release
journal, May 2018


Three‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Implications for Cosmology
journal, June 2007

  • Spergel, D. N.; Bean, R.; Dore, O.
  • The Astrophysical Journal Supplement Series, Vol. 170, Issue 2
  • DOI: 10.1086/513700

The Sloan Digital Sky Survey Quasar Catalog: Twelfth data release
journal, January 2017


QUASARS PROBING QUASARS. VI. EXCESS H I ABSORPTION WITHIN ONE PROPER Mpc OF z ∼ 2 QUASARS
journal, October 2013

  • Prochaska, J. Xavier; Hennawi, Joseph F.; Lee, Khee-Gan
  • The Astrophysical Journal, Vol. 776, Issue 2
  • DOI: 10.1088/0004-637X/776/2/136

Systematic QSO emission-line velocity shifts and new unbiased redshifts
journal, March 1992

  • Tytler, David; Fan, Xiao-Ming
  • The Astrophysical Journal Supplement Series, Vol. 79
  • DOI: 10.1086/191642

Host Galaxies of Two Micron All Sky Survey-selected QSOs at Redshift over 0.3
journal, February 2006

  • Hutchings, J. B.; Cherniawsky, A.; Cutri, R. M.
  • The Astronomical Journal, Vol. 131, Issue 2
  • DOI: 10.1086/498725

A Catalog of Quasar Properties from Sloan Digital sky Survey data Release 7
journal, June 2011

  • Shen, Yue; Richards, Gordon T.; Strauss, Michael A.
  • The Astrophysical Journal Supplement Series, Vol. 194, Issue 2
  • DOI: 10.1088/0067-0049/194/2/45

Improved redshifts for SDSS quasar spectra: Improved SDSS redshifts
journal, April 2010


The Sloan Digital sky Survey Quasar Catalog. v. Seventh data Release
journal, April 2010


Evaluating and improving the redshifts of z > 2.2 quasars
journal, May 2017

  • Mason, Michelle; Brotherton, Michael S.; Myers, Adam
  • Monthly Notices of the Royal Astronomical Society, Vol. 469, Issue 4
  • DOI: 10.1093/mnras/stx1080

Reverberation Mapping of High‐Luminosity Quasars: First Results
journal, April 2007

  • Kaspi, Shai; Brandt, W. N.; Maoz, Dan
  • The Astrophysical Journal, Vol. 659, Issue 2
  • DOI: 10.1086/512094

The Sloan Digital Sky Survey quasar catalog: tenth data release
journal, March 2014


A Catalog of Broad Absorption line Quasars in Sloan Digital sky Survey data Release 5
journal, February 2009