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Analysis of Emission Line Widths of [CII] 158μm

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A study of [CII] 158 μm emission line profiles observed with Herschel PACS for 379 galaxies is presented. Emission line widths are compared to [CII] luminosities, to near-infrared 1.6 μm luminosities and to infrared 22 μm luminosities to decide if any luminosity relates to velocity dispersion. Archival data for [CII] fluxes and line profiles are taken from http://cassis.sirtf.com/herschel/. Line profiles are classified as Gaussian, flattened and asymmetric. H magnitudes are taken from 2MASS catalogues, and 22 μm fluxes from the WISE catalogue. These luminosities are compared to [CII] line Full Width Half Maximum. Asymmetric profiles are not primarily AGN, which indicates that asymmetries are not produced primarily by outflows from the nuclear region. [CII] line widths do not show a significant correlation with any measure of galaxy luminosity. The correlation having smallest dispersion is with the H band luminosity for which L(H) ~ FWHM0.73, which is a much flatter correlation than the L ~ FWHM4 previously found for optical emission lines or stellar velocity dispersions.

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Authors and Affiliations

  1. V. A. Ambartsumian Byurakan Astrophysical Observatory (BAO), Byurakan, Armenia

    A. L. Samsonyan

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  1. A. L. Samsonyan
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Correspondence to A. L. Samsonyan.

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Published in Astrofizika, Vol. 65, No. 2, pp. 167-177 (May 2022).

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Samsonyan, A.L. Analysis of Emission Line Widths of [CII] 158μm. Astrophysics 65, 151–160 (2022). https://doi.org/10.1007/s10511-022-09728-0

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  • DOI: https://doi.org/10.1007/s10511-022-09728-0

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