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Title: Connecting CO intensity mapping to molecular gas and star formation in the epoch of galaxy assembly

Abstract

Intensity mapping, which images a single spectral line from unresolved galaxies across cosmological volumes, is a promising technique for probing the early universe. Here we present predictions for the intensity map and power spectrum of the CO(1–0) line from galaxies at $$z\sim 2.4$$–2.8, based on a parameterized model for the galaxy–halo connection, and demonstrate the extent to which properties of high-redshift galaxies can be directly inferred from such observations. We find that our fiducial prediction should be detectable by a realistic experiment. Motivated by significant modeling uncertainties, we demonstrate the effect on the power spectrum of varying each parameter in our model. Using simulated observations, we infer constraints on our model parameter space with an MCMC procedure, and show corresponding constraints on the $${L}_{\mathrm{IR}}$$–$${L}_{\mathrm{CO}}$$ relation and the CO luminosity function. These constraints would be complementary to current high-redshift galaxy observations, which can detect the brightest galaxies but not complete samples from the faint end of the luminosity function. Furthermore, by probing these populations in aggregate, CO intensity mapping could be a valuable tool for probing molecular gas and its relation to star formation in high-redshift galaxies.

Authors:
 [1];  [2];  [1];  [1]
  1. Stanford Univ., Stanford, CA (United States)
  2. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1257726
Report Number(s):
SLAC-PUB-16572
Journal ID: ISSN 1538-4357
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 817; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; galaxies: high-redshift; galaxies: evolution; ISM: molecules

Citation Formats

Li, Tony Y., Wechsler, Risa H., Devaraj, Kiruthika, and Church, Sarah E.. Connecting CO intensity mapping to molecular gas and star formation in the epoch of galaxy assembly. United States: N. p., 2016. Web. https://doi.org/10.3847/0004-637X/817/2/169.
Li, Tony Y., Wechsler, Risa H., Devaraj, Kiruthika, & Church, Sarah E.. Connecting CO intensity mapping to molecular gas and star formation in the epoch of galaxy assembly. United States. https://doi.org/10.3847/0004-637X/817/2/169
Li, Tony Y., Wechsler, Risa H., Devaraj, Kiruthika, and Church, Sarah E.. Fri . "Connecting CO intensity mapping to molecular gas and star formation in the epoch of galaxy assembly". United States. https://doi.org/10.3847/0004-637X/817/2/169. https://www.osti.gov/servlets/purl/1257726.
@article{osti_1257726,
title = {Connecting CO intensity mapping to molecular gas and star formation in the epoch of galaxy assembly},
author = {Li, Tony Y. and Wechsler, Risa H. and Devaraj, Kiruthika and Church, Sarah E.},
abstractNote = {Intensity mapping, which images a single spectral line from unresolved galaxies across cosmological volumes, is a promising technique for probing the early universe. Here we present predictions for the intensity map and power spectrum of the CO(1–0) line from galaxies at $z\sim 2.4$–2.8, based on a parameterized model for the galaxy–halo connection, and demonstrate the extent to which properties of high-redshift galaxies can be directly inferred from such observations. We find that our fiducial prediction should be detectable by a realistic experiment. Motivated by significant modeling uncertainties, we demonstrate the effect on the power spectrum of varying each parameter in our model. Using simulated observations, we infer constraints on our model parameter space with an MCMC procedure, and show corresponding constraints on the ${L}_{\mathrm{IR}}$–${L}_{\mathrm{CO}}$ relation and the CO luminosity function. These constraints would be complementary to current high-redshift galaxy observations, which can detect the brightest galaxies but not complete samples from the faint end of the luminosity function. Furthermore, by probing these populations in aggregate, CO intensity mapping could be a valuable tool for probing molecular gas and its relation to star formation in high-redshift galaxies.},
doi = {10.3847/0004-637X/817/2/169},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 817,
place = {United States},
year = {2016},
month = {1}
}

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Cited by: 14 works
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