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Title: Low-frequency Carbon Radio Recombination Lines. II. The Diffuse Interstellar Medium

Abstract

In the second paper of the series, we have modeled low-frequency carbon radio recombination lines (CRRLs) from the interstellar medium. Anticipating the Low Frequency Array survey of Galactic CRRLs, we focus our study on the physical conditions of the diffuse, cold neutral medium. We have used the improved departure coefficients computed in the first paper of the series to calculate line-to-continuum ratios. The results show that the line width and integrated optical depths of CRRLs are sensitive probes of the electron density, gas temperature, and emission measure of the cloud. Furthermore, the ratio of CRRL to the [C ii] at the 158 μ m line is a strong function of the temperature and density of diffuse clouds. Guided by our calculations, we analyze CRRL observations and illustrate their use with data from the literature.

Authors:
; ; ; ; ; ;  [1]
  1. Leiden Observatory, University of Leiden, P.O. Box 9513, 2300 RA Leiden (Netherlands)
Publication Date:
OSTI Identifier:
22661286
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 837; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CARBON; CLOUDS; DENSITY; DIFFUSION; ELECTRON DENSITY; EMISSION; INTERSTELLAR SPACE; LINE WIDTHS; RADIANT HEAT TRANSFER; RECOMBINATION

Citation Formats

Salgado, F., Morabito, L. K., Oonk, J. B. R., Salas, P., Toribio, M. C., Röttgering, H. J. A., and Tielens, A. G. G. M.. Low-frequency Carbon Radio Recombination Lines. II. The Diffuse Interstellar Medium. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA5D9A.
Salgado, F., Morabito, L. K., Oonk, J. B. R., Salas, P., Toribio, M. C., Röttgering, H. J. A., & Tielens, A. G. G. M.. Low-frequency Carbon Radio Recombination Lines. II. The Diffuse Interstellar Medium. United States. doi:10.3847/1538-4357/AA5D9A.
Salgado, F., Morabito, L. K., Oonk, J. B. R., Salas, P., Toribio, M. C., Röttgering, H. J. A., and Tielens, A. G. G. M.. Fri . "Low-frequency Carbon Radio Recombination Lines. II. The Diffuse Interstellar Medium". United States. doi:10.3847/1538-4357/AA5D9A.
@article{osti_22661286,
title = {Low-frequency Carbon Radio Recombination Lines. II. The Diffuse Interstellar Medium},
author = {Salgado, F. and Morabito, L. K. and Oonk, J. B. R. and Salas, P. and Toribio, M. C. and Röttgering, H. J. A. and Tielens, A. G. G. M.},
abstractNote = {In the second paper of the series, we have modeled low-frequency carbon radio recombination lines (CRRLs) from the interstellar medium. Anticipating the Low Frequency Array survey of Galactic CRRLs, we focus our study on the physical conditions of the diffuse, cold neutral medium. We have used the improved departure coefficients computed in the first paper of the series to calculate line-to-continuum ratios. The results show that the line width and integrated optical depths of CRRLs are sensitive probes of the electron density, gas temperature, and emission measure of the cloud. Furthermore, the ratio of CRRL to the [C ii] at the 158 μ m line is a strong function of the temperature and density of diffuse clouds. Guided by our calculations, we analyze CRRL observations and illustrate their use with data from the literature.},
doi = {10.3847/1538-4357/AA5D9A},
journal = {Astrophysical Journal},
number = 2,
volume = 837,
place = {United States},
year = {Fri Mar 10 00:00:00 EST 2017},
month = {Fri Mar 10 00:00:00 EST 2017}
}