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Diagnostic Value of Mid-Infrared Fine Structure Lines in Galaxies

Bot, Caroline (2008) Diagnostic Value of Mid-Infrared Fine Structure Lines in Galaxies. In: Galaxies in the Local Volume. Astrophysics and Space Science Proceedings. Springer , Dordrecht, pp. 85-88. ISBN 978-1-4020-6932-1.

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Infrared fine structure lines are commonly observed in H II regions, where they are primarily excited by collisions between electrons and ions. Widely used empirical methods combine the emission from these with hydrogen recombination lines or radio continuum measurements to deduce heavy element abundances. However, these abundance studies could have issues. In particular, they rely on the assumption that ionized hydrogen and the different ionized heavy elements are co-spatial. We present an analysis of fine structure line emission from Ar, Ne and S in the nuclei of nearby galaxies from the Spitzer Infrared Nearby Galaxies Survey (SINGS) observed with the Infrared Spectrograph (IRS) onboard the Spitzer Space Telescope, and in a sample of Galactic H II regions observed with the Short Wavelength Spectrometer (SWS) (Giveon et al. [3]). The goal is to compare the emission measure weighted filling factors deduced from each element (H, Ar, Ne and S) in order to test for consistency and improve the diagnostic value of these lines.

Item Type:Book Section
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Additional Information:© 2008 Springer Science+Business Media B.V. First Online: 30 April 2008.
Subject Keywords:Structure Line; Oxygen Abundance; Lower Ionization Potential; Heavy Element Abundance; Photoionization Model
Series Name:Astrophysics and Space Science Proceedings
Record Number:CaltechAUTHORS:20191127-131654077
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100109
Deposited By: Tony Diaz
Deposited On:28 Nov 2019 01:50
Last Modified:16 Nov 2021 17:51

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