The Star Formation Rate-Dense Gas Relation as Measured by HCN (J=3-2) Emission


We present observations made with the 10 m Heinrich Hertz Submillimeter Telescope of HCN(3–2) emission from a sample of 30 nearby galaxies ranging in infrared luminosity from 10 to 10 and HCN(3–2) luminosity L, from 10 to 10 K km s 1 pc. We examine the correlation between the infrared luminosity and HCN(3–2) luminosity and find that the best-fit linear regression has a slope (in log-log space) of . Including 0.74 0.12 recently published data from Graciá-Carpio et al. tightens the constraints on the best-fit slope to . 0.79 0.09 This slope below unity suggests that the HCN(3–2) molecular line luminosity is not linearly tracing the amount of dense gas. Our results are consistent with predictions from recent theoretical models that find slopes below unity when the line luminosity depends on the average gas density with a power-law index greater than a KennicuttSchmidt index of 1.5. Subject headings: galaxies: evolution — galaxies: ISM — submillimeter Online material: color figures

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@inproceedings{Bussman2017TheSF, title={The Star Formation Rate-Dense Gas Relation as Measured by HCN (J=3-2) Emission}, author={R. S. Bussman and Desika Narayanan and R. Shane Bussmann and Y. L. Shirley and Steve Juneau and Jingwen Wu and Philip M. Solomon and Paul A. Vanden Bout and John Moustakas and Christopher Walker}, year={2017} }