http://arxiv.org/abs/1509.07512
We present new IRAM 30m spectroscopic observations of the $\sim88$ GHz band, including emission from the CCH (n=1-0) multiplet, HCN (1-0), HCO+ (1-0), and HNC (1-0), for a sample of 58 local luminous and ultraluminous infrared galaxies from the Great Observatories All-sky LIRG Survey (GOALS). By combining our new IRAM data with literature data and Spitzer/IRS spectroscopy, we study the correspondence between these putative tracers of dense gas and the relative contribution of active galactic nuclei (AGN) and star formation to the mid-infrared luminosity of each system. We find the HCN (1-0) emission to be enhanced in AGN-dominated systems ($\langle$L’$_{HCN (1-0)}$/L’$_{HCO^+ (1-0)}\rangle=1.84$), compared to composite and starburst-dominated systems ($\langle$L’$_{HCN (1-0)}$/L’$_{HCO^+ (1-0)}\rangle=1.14$, and 0.88, respectively). However, some composite and starburst systems have L’$_{HCN (1-0)}$/L’$_{HCO^+ (1-0)}$ ratios comparable to those of AGN, indicating that enhanced HCN emission is not uniquely associated with energetically dominant AGN. After removing AGN-dominated systems from the sample, we find a linear relationship (within the uncertainties) between $\log_{10}$(L’$_{HCN (1-0)}$) and $\log_{10}$(L$_{IR}$), consistent with most previous findings. L’$_{HCN (1-0)}$/L$_{IR}$, typically interpreted as the dense gas depletion time, appears to have no systematic trend with L$_{IR}$ for our sample of luminous and ultraluminous infrared galaxies, and has significant scatter. The galaxy-integrated HCN (1-0) and HCO+ (1-0) emission do not appear to have a simple interpretation, in terms of the AGN dominance or the star formation rate, and are likely determined by multiple processes, including density and radiative effects.
G. Privon, R. Herrero-Illana, A. Evans, et. al.
Mon, 28 Sep 15
17/67
Comments: 18 pages, 7 figures, 3 tables. accepted for publication in ApJ
You must be logged in to post a comment.