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The ALMaQUEST Survey XII: Dense Molecular Gas as traced by HCN and HCO$^{+}$ in Green Valley Galaxies by Lin, Lihwai; Pan, Hsi-An; Ellison, Sara L.; Harada, Nanase; Jimenez-Donaire, Maria J.; French, K. Decker; Baker, William M.; Hsieh, Bau-Ching; Koyama, Yusei; Lopez-Coba, Carlos; Michiyama, Tomonari; Rowlands, Kate; Sanchez, Sebastian F.; Thorp, Mallory is a scholarly article available to read on EtoBox.

What is The ALMaQUEST Survey XII: Dense Molecular Gas as traced by HCN and HCO$^{+}$ in Green Valley Galaxies about?

We present ALMA observations of two dense gas tracers, HCN(1-0) and HCO$^{+}$(1-0), for three galaxies in the green valley and two galaxies on the star-forming main sequence with comparable molecular gas fractions as traced by the CO(1-0) emissions, selected from the ALMaQUEST survey. We investigate whether the deficit of molecular gas star formation efficiency (SFE$_{\rm mol}$) that leads to the low specific star formation rate in these green valley galaxies is due to a lack of dense gas (characterized by the dense gas fraction $f_{\rm dense}$) or the low star formation efficiency of dense gas (SFE$_{\rm dense}$). We find that SFE$_{\rm mol}$ as traced by the CO emissions, when considering both star-forming and retired spaxels together, is tightly correlated with SFE$_{\rm dense}$ and depends only weakly on $f_{\rm dense}$. The specific star formation rate (sSFR) on kpc scales is primarily driven by SFE$_{\rm mol}$ and SFE$_{\rm dense}$, followed by the dependence on $f_{\rm mol}$, and is least correlated with $f_{\rm dense}$ or the dense-to-stellar mass ratio ($R_{\rm dense}$). When compared with other works in the literature, we find that our green valley sample shows lower glob

Author

Lin, Lihwai; Pan, Hsi-An; Ellison, Sara L.; Harada, Nanase; Jimenez-Donaire, Maria J.; French, K. Decker; Baker, William M.; Hsieh, Bau-Ching; Koyama, Yusei; Lopez-Coba, Carlos; Michiyama, Tomonari; Rowlands, Kate; Sanchez, Sebastian F.; Thorp, Mallory

Published

2024

Language

EN