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Title: The Halo Mass of Optically Luminous Quasars at z ≈ 1–2 Measured via Gravitational Deflection of the Cosmic Microwave Background

Abstract

We measure the average deflection of cosmic microwave background photons by quasars at $$\langle z\rangle =1.7$$. Our sample is selected from the Sloan Digital Sky Survey to cover the redshift range 0.9 ≤ z ≤ 2.2 with absolute i-band magnitudes of M i ≤ –24 (K-corrected to z = 2). A stack of nearly 200,000 targets reveals an 8σ detection of Planck's estimate of the lensing convergence toward the quasars. We fit the signal with a model comprising a Navarro–Frenk–White density profile and a two-halo term accounting for correlated large-scale structure, which dominates the observed signal. The best-fitting model is described by an average halo mass $${\mathrm{log}}_{10}({M}_{{\rm{h}}}/{h}^{-1}\,{M}_{\odot })=12.6\pm 0.2$$ and linear bias b = 2.7 ± 0.3 at $$\langle z\rangle =1.7$$, in excellent agreement with clustering studies. Here, we also report a hint, at a 90% confidence level, of a correlation between the convergence amplitude and luminosity, indicating that quasars brighter than M i lesssim –26 reside in halos of typical mass $${M}_{{\rm{h}}}\approx {10}^{13}\,{h}^{-1}\,{M}_{\odot }$$, scaling roughly as $${M}_{{\rm{h}}}\propto {L}_{\mathrm{opt}}^{3/4}$$ at $${M}_{i}\lesssim -24$$ mag, in good agreement with physically motivated quasar demography models. Although we acknowledge that this luminosity dependence is a marginal result, the observed M h–L opt relationship could be interpreted as a reflection of the cutoff in the distribution of black hole accretion rates toward high Eddington ratios: the weak trend of M h with L opt observed at low luminosity becomes stronger for the most powerful quasars, which tend to be accreting close to the Eddington limit.

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [4];  [1]; ORCiD logo [5]
  1. Univ. of Hertfordshire, Hatfield (United Kingdom)
  2. Univ. of Edinburgh (United Kingdom)
  3. Univ. of Wyoming, Laramie, WY (United States)
  4. Dartmouth College, Hanover, NH (United States)
  5. Harvard & Smithsonian, Cambridge, MA (United States)
Publication Date:
Research Org.:
Univ. of Wyoming, Laramie, WY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); European Research Council (ERC); National Science Foundation (NSF)
OSTI Identifier:
1597285
Grant/Contract Number:  
SC0019022; 670193; 1616168; 1515364; 1554584; NNX16AN48G; NNX15AU32
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 874; 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: evolution; galaxies: halos; galaxies: high-redshift; large-scale structure of universe; quasars: general

Citation Formats

Geach, J. E., Peacock, J. A., Myers, A. D., Hickox, R. C., Burchard, M. C., and Jones, M. L. The Halo Mass of Optically Luminous Quasars at z ≈ 1–2 Measured via Gravitational Deflection of the Cosmic Microwave Background. United States: N. p., 2019. Web. doi:10.3847/1538-4357/ab0894.
Geach, J. E., Peacock, J. A., Myers, A. D., Hickox, R. C., Burchard, M. C., & Jones, M. L. The Halo Mass of Optically Luminous Quasars at z ≈ 1–2 Measured via Gravitational Deflection of the Cosmic Microwave Background. United States. https://doi.org/10.3847/1538-4357/ab0894
Geach, J. E., Peacock, J. A., Myers, A. D., Hickox, R. C., Burchard, M. C., and Jones, M. L. Wed . "The Halo Mass of Optically Luminous Quasars at z ≈ 1–2 Measured via Gravitational Deflection of the Cosmic Microwave Background". United States. https://doi.org/10.3847/1538-4357/ab0894. https://www.osti.gov/servlets/purl/1597285.
@article{osti_1597285,
title = {The Halo Mass of Optically Luminous Quasars at z ≈ 1–2 Measured via Gravitational Deflection of the Cosmic Microwave Background},
author = {Geach, J. E. and Peacock, J. A. and Myers, A. D. and Hickox, R. C. and Burchard, M. C. and Jones, M. L.},
abstractNote = {We measure the average deflection of cosmic microwave background photons by quasars at $\langle z\rangle =1.7$. Our sample is selected from the Sloan Digital Sky Survey to cover the redshift range 0.9 ≤ z ≤ 2.2 with absolute i-band magnitudes of M i ≤ –24 (K-corrected to z = 2). A stack of nearly 200,000 targets reveals an 8σ detection of Planck's estimate of the lensing convergence toward the quasars. We fit the signal with a model comprising a Navarro–Frenk–White density profile and a two-halo term accounting for correlated large-scale structure, which dominates the observed signal. The best-fitting model is described by an average halo mass ${\mathrm{log}}_{10}({M}_{{\rm{h}}}/{h}^{-1}\,{M}_{\odot })=12.6\pm 0.2$ and linear bias b = 2.7 ± 0.3 at $\langle z\rangle =1.7$, in excellent agreement with clustering studies. Here, we also report a hint, at a 90% confidence level, of a correlation between the convergence amplitude and luminosity, indicating that quasars brighter than M i lesssim –26 reside in halos of typical mass ${M}_{{\rm{h}}}\approx {10}^{13}\,{h}^{-1}\,{M}_{\odot }$, scaling roughly as ${M}_{{\rm{h}}}\propto {L}_{\mathrm{opt}}^{3/4}$ at ${M}_{i}\lesssim -24$ mag, in good agreement with physically motivated quasar demography models. Although we acknowledge that this luminosity dependence is a marginal result, the observed M h–L opt relationship could be interpreted as a reflection of the cutoff in the distribution of black hole accretion rates toward high Eddington ratios: the weak trend of M h with L opt observed at low luminosity becomes stronger for the most powerful quasars, which tend to be accreting close to the Eddington limit.},
doi = {10.3847/1538-4357/ab0894},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 874,
place = {United States},
year = {Wed Mar 27 00:00:00 EDT 2019},
month = {Wed Mar 27 00:00:00 EDT 2019}
}

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Cited by: 11 works
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