A large CO and HCN line survey of Luminous Infrared Galaxies

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dc.creatorPapadopoulos, Padelis P.
dc.creatorGreve, Thomas R.
dc.creatorvan der Werf, Paul
dc.creatorMüehle, Stefanie
dc.creatorIsaak, Kate
dc.creatorGao, Yu
dc.date2007-01-29
dc.date.accessioned2026-07-07T07:43:25Z
dc.date.available2026-07-07T07:43:25Z
dc.descriptionA large CO, HCN multi-transition survey of 30 Luminous Infrared Galaxies ($\rm L_{IR}>10^{11} L_{\odot}$) is nearing completion with the James Clerk Maxwell Telescope (JCMT) on Mauna Kea (Hawaii), and the IRAM 30-meter telescope at Pico Veleta (Spain). The CO J=1--0, 2--1, 3--2, 4--3,6--5, $ ^{13}$CO J=2--1, HCN J=1--0, 3--2, 4--3 observations, resulting from $\sim 250$ hours of JCMT, $\sim 100$ hours of 30-m observing time and data from the literature constitute {\it the largest extragalactic molecular line survey to date}, and can be used to address a wide range of issues and eventually allow the construction of reliable Spectral Line Energy Distributions (SLEDs) for the molecular gas in local starbursts. First results suggest that: a) HCN and HCO$^+$ J=1--0 line luminosities can be poor mass estimators of dense molecular gas ($\rm n\geq 10^4 cm^{-3}$) unless their excitation is accounted for, b) CO cooling of such gas in ULIRGs may be comparable to that of the CII line at $\rm 158 μm$, and c) low excitation of the {\it global} molecular gas reservoir remains possible in such systems. In such cases the expected low CO $\rm J+1\to J$ line luminosities for $\rm J+1\geq 4$ can lead to a strong bias against their detection from ULIRGs at high redshifts.
dc.description4 pages, to appear in Astrophysics and Space Science (special issue for 2006 conference "Science with ALMA: a new era for Astrophysics")
dc.identifierhttps://arxiv.org/abs/astro-ph/0701829
dc.identifierhttp://arxiv.org/abs/astro-ph/0701829
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/122818
dc.subjectAstrophysics
dc.titleA large CO and HCN line survey of Luminous Infrared Galaxies
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