High Resolution Molecular Absorption Line Spectroscopy Of The Ultraluminous Infrared Galaxy NGC 4418

Details High Resolution Molecular Absorption Line Spectroscopy Of The Ultraluminous Infrared Galaxy NGC 4418 High Resolution Molecular Absorption Line Spectroscopy Of The Ultraluminous Infrared Galaxy NGC 4418

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21114110b&link_type=abstract

American Astronomical Society, AAS Meeting #211, #141.10; Bulletin of the American Astronomical Society, Vol. 39, p.992

Astronomy and Astrophysics

Astronomy

Scientific paper

We report high resolution (R˜75,000) observations of ν5; = 1-0 R-branch transitions of acetylene (C2H2) toward the Ultraluminous Infrared Galaxy NGC 4418 with the Texas Echelon Cross Echelle Spectrometer (TEXES) on Gemini North. We compare the results with low-resolution Spitzer observations of the Q-branch of C2H2 of Lahuis et al. (2007). We use the ratio of the R(13) and R(14) lines to estimate the optical depth and the ratio of the R(13) and R(9) lines to estimate the rotational temperature of the gas. We derive a higher column density and a lower temperature than reported by Lahuis et al. The signal-to-noise ratio of the TEXES data is insufficient to distinguish between a single absorber model and one in which an ensemble of absorbers is required to reproduce the structure of the R-branch lines. We also compare the observed widths and Doppler shifts of the lines to those from millimeter observations of Imanishi et al. (2004). We discuss the implications of the observed turbulent velocity on the region of formation of the C2H2.

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