Cs Absorption At 140 Nm In Spectra Acquired With The Hubble Space Telescope

Federman, Steven

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https://hdl.handle.net/2142/116681 Copy

Description

Title

Cs Absorption At 140 Nm In Spectra Acquired With The Hubble Space Telescope

Author(s)

Federman, Steven

Contributor(s)

• Jackson, William M.
• Xu, Zhongxing
• Crabtree, Kyle N.
• Ritchey, Adam

Issue Date

2022-06-23

Keyword(s)

Astronomy

Abstract

We reexamine the abundance of CS in diffuse molecular clouds from lines in the $C$--$X$ (0,~0) band by including additional sight lines not available in previous work and by extracting information on molecular structure. The analysis incorporates results from our recent large-scale calculations on CS photodissociation and adopts the approach taken in our study of the $F$--$X$ (0,~0) and (1,~0) bands in C$_2$. Syntheses of the high-resolution spectra with the best signal to noise yielded wavelengths for the R(0), R(1), and P(1) lines and their widths. Significant line broadening is seen, yielding a predissociation width of $23.7\pm0.7$ m\AA; this value is within a factor of 2 of the predictions from the calculations. The computations also revealed similar rotational constants for the $X$ and $C$ states. The differences in transition frequencies among the three lines then suggest that the P(1) line is shifted by 2.27 cm$^{-1}$. We also found evidence that the strengths for the R(1) and P(1) lines were affected by the perturbation. The fits to the data for the other directions in the sample adopted these refined line parameters to determine column densities. A comparison of the CS column densities with results for CH, CN, CO, and H$_2$ helped inform us of the chemical pathways leading to CS in diffuse molecular gas.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116681

DOI

https://doi.org/10.15278/isms.2022.RN10

Copyright and License Information

Copyright 2022 held by the authors

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