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A Self-consistent Framework for Multiline Modeling in Line Intensity Mapping Experiments

Sun, Guochao and Hensley, Brandon S. and Chang, Tzu-Ching and Doré, Olivier and Serra, Paolo (2019) A Self-consistent Framework for Multiline Modeling in Line Intensity Mapping Experiments. Astrophysical Journal, 887 (2). Art. No. 142. ISSN 1538-4357.

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Line intensity mapping (LIM) is a promising approach to study star formation and the interstellar medium (ISM) in galaxies by measuring the aggregate line emission from the entire galaxy population. In this work, we develop a simple yet physically motivated framework for modeling the line emission as would be observed in LIM experiments. It is done by building on analytic models of the cosmic infrared background that connect total infrared luminosity of galaxies to their host dark matter halos. We present models of the H I 21 cm, CO (1−0), [C II] 158 μm, and [N II] 122 and 205 μm lines consistent with current observational constraints. With four case studies of various combinations of these lines that probe different ISM phases, we demonstrate the potential for reliably extracting physical properties of the ISM, and the evolution of these properties with cosmic time, from auto- and cross-correlation analysis of these lines as measured by future LIM experiments.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Sun, Guochao0000-0003-4070-497X
Hensley, Brandon S.0000-0001-7449-4638
Doré, Olivier0000-0002-5009-7563
Alternate Title:A Self-Consistent Framework for Multi-Line Modeling in Line Intensity Mapping Experiments
Additional Information:© 2019 The American Astronomical Society. Received 2019 August 16; revised 2019 October 31; accepted 2019 November 8; published 2019 December 17. We would like to thank the anonymous referee for comments that helped improve this paper. We would like to thank Hao-Yi (Heidi) Wu for helpful discussion on the CIB model, as well as Garrett (Karto) Keating and Ryan Keenan for compiling and sharing the constraints on cosmic molecular gas content. We are also grateful to Jamie Bock, Matt Bradford, Patrick Breysse, Paul Goldsmith, Adam Lidz, Lunjun Liu, Lluis Mas-Ribas, and Anthony Pullen for constructive discussion and comments on this work. Part of the research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. Software: corner (Foreman-Mackey 2016), emcee (Foreman-Mackey et al. 2013), hmf (Murray et al. 2013), matplotlib (Hunter 2007), numpy (van der Walt et al. 2011) and scipy (Jones et al. 2001).
Funding AgencyGrant Number
Subject Keywords:Galaxy evolution; Interstellar medium; Large-scale structure of the universe; Observational cosmology; Molecular gas; Photodissociation regions; H I line emission
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Galaxy evolution (594); Interstellar medium (847); Large-scale structure of the universe (902); Observational cosmology (1146); Molecular gas (1073); Photodissociation regions (1223); H I line emission (690)
Record Number:CaltechAUTHORS:20190925-093529654
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Official Citation:Guochao Sun et al 2019 ApJ 887 142
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98844
Deposited By: Tony Diaz
Deposited On:25 Sep 2019 17:19
Last Modified:20 Dec 2019 16:57

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