The effects of charge transfer on the thermal equilibrium of photoionized nebulae

J. B. Kingdon; G. J. Ferland

doi:10.1086/312008

The effects of charge transfer on the thermal equilibrium of photoionized nebulae

J. B. Kingdon, G. J. Ferland

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

Charge transfer can affect both the ionization and thermal balance of astrophysical plasmas. Using the most recent rate coefficients and energy defects, we calculate the heating/cooling rates for charge transfer reactions between hydrogen and elements up to Z = 30. We incorporate these values into the photoionization code CLOUDY. Results from models approximating a wide range of astrophysical objects and conditions suggest that charge transfer can make a significant contribution to the heating near the H ionization front, particularly in objects with a hard ionizing continuum or enhanced abundances. Charge transfer heating can also be important in regimes in which the usual heating/cooling agents are suppressed, such as the emission-line clouds near quasars. We list those reactions that are most important for determining the thermal balance, in the hopes of facilitating improved atomic data.

Original language	English
Pages (from-to)	L107-L109
Journal	Astrophysical Journal
Volume	516
Issue number	2 PART 2
DOIs	https://doi.org/10.1086/312008
State	Published - May 10 1999

Bibliographical note

Funding Information:
The authors acknowledge useful discussions with P. C. Stancil, C. Knigge, E. R. Capriotti, and K. MacAdam. This research was supported in part by the Office of Fusion Energy Sciences, US Department of Energy, under contract DE-AC05-96OR22464 with Lockheed Martin Energy Research Corp. and by an appointment for J. B. K. to the Oak Ridge National Laboratory (ORNL) Postdoctoral Research Associates Program administered jointly by ORNL and by the Oak Ridge Institute for Science and Education. CLOUDY has been generously supported by the National Science Foundation and NASA. G. J. F. would like to thank the Canadian Institute for Theoretical Astrophysics for their hospitality during his visit.

Funding Information:
The authors acknowledge useful discussions with P. C. Stan-cil, C. Knigge, E. R. Capriotti, and K. MacAdam. This research was supported in part by the Office of Fusion Energy Sciences, US Department of Energy, under contract DE-AC05-96OR22464 with Lockheed Martin Energy Research Corp. and by an appointment for J. B. K. to the Oak Ridge National Laboratory (ORNL) Postdoctoral Research Associates Program administered jointly by ORNL and by the Oak Ridge Institute for Science and Education. CLOUDY has been generously supported by the National Science Foundation and NASA. G. J. F. would like to thank the Canadian Institute for Theoretical Astrophysics for their hospitality during his visit.

Keywords

Atomic data
Atomic processes

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/312008

Cite this

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title = "The effects of charge transfer on the thermal equilibrium of photoionized nebulae",

abstract = "Charge transfer can affect both the ionization and thermal balance of astrophysical plasmas. Using the most recent rate coefficients and energy defects, we calculate the heating/cooling rates for charge transfer reactions between hydrogen and elements up to Z = 30. We incorporate these values into the photoionization code CLOUDY. Results from models approximating a wide range of astrophysical objects and conditions suggest that charge transfer can make a significant contribution to the heating near the H ionization front, particularly in objects with a hard ionizing continuum or enhanced abundances. Charge transfer heating can also be important in regimes in which the usual heating/cooling agents are suppressed, such as the emission-line clouds near quasars. We list those reactions that are most important for determining the thermal balance, in the hopes of facilitating improved atomic data.",

keywords = "Atomic data, Atomic processes",

author = "Kingdon, {J. B.} and Ferland, {G. J.}",

note = "Funding Information: The authors acknowledge useful discussions with P. C. Stancil, C. Knigge, E. R. Capriotti, and K. MacAdam. This research was supported in part by the Office of Fusion Energy Sciences, US Department of Energy, under contract DE-AC05-96OR22464 with Lockheed Martin Energy Research Corp. and by an appointment for J. B. K. to the Oak Ridge National Laboratory (ORNL) Postdoctoral Research Associates Program administered jointly by ORNL and by the Oak Ridge Institute for Science and Education. CLOUDY has been generously supported by the National Science Foundation and NASA. G. J. F. would like to thank the Canadian Institute for Theoretical Astrophysics for their hospitality during his visit. Funding Information: The authors acknowledge useful discussions with P. C. Stan-cil, C. Knigge, E. R. Capriotti, and K. MacAdam. This research was supported in part by the Office of Fusion Energy Sciences, US Department of Energy, under contract DE-AC05-96OR22464 with Lockheed Martin Energy Research Corp. and by an appointment for J. B. K. to the Oak Ridge National Laboratory (ORNL) Postdoctoral Research Associates Program administered jointly by ORNL and by the Oak Ridge Institute for Science and Education. CLOUDY has been generously supported by the National Science Foundation and NASA. G. J. F. would like to thank the Canadian Institute for Theoretical Astrophysics for their hospitality during his visit.",

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N2 - Charge transfer can affect both the ionization and thermal balance of astrophysical plasmas. Using the most recent rate coefficients and energy defects, we calculate the heating/cooling rates for charge transfer reactions between hydrogen and elements up to Z = 30. We incorporate these values into the photoionization code CLOUDY. Results from models approximating a wide range of astrophysical objects and conditions suggest that charge transfer can make a significant contribution to the heating near the H ionization front, particularly in objects with a hard ionizing continuum or enhanced abundances. Charge transfer heating can also be important in regimes in which the usual heating/cooling agents are suppressed, such as the emission-line clouds near quasars. We list those reactions that are most important for determining the thermal balance, in the hopes of facilitating improved atomic data.

AB - Charge transfer can affect both the ionization and thermal balance of astrophysical plasmas. Using the most recent rate coefficients and energy defects, we calculate the heating/cooling rates for charge transfer reactions between hydrogen and elements up to Z = 30. We incorporate these values into the photoionization code CLOUDY. Results from models approximating a wide range of astrophysical objects and conditions suggest that charge transfer can make a significant contribution to the heating near the H ionization front, particularly in objects with a hard ionizing continuum or enhanced abundances. Charge transfer heating can also be important in regimes in which the usual heating/cooling agents are suppressed, such as the emission-line clouds near quasars. We list those reactions that are most important for determining the thermal balance, in the hopes of facilitating improved atomic data.

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The effects of charge transfer on the thermal equilibrium of photoionized nebulae

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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