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A Search for Dense Molecular Gas in High Redshift Infrared-Luminous Galaxies | | C. L. Carilli
; P. Solomon
; P. Vanden Bout
; F. Walter
; Alexandre Beelen
; Pierre Cox
; F. Bertoldi
; K. M. Menten
; Kate G. Isaak
; C.J. Chandler
; A. Omont
; | | Date: |
2 Sep 2004 | | Journal: | Astrophys.J. 618 (2005) 586-591 | | Subject: | astro-ph | | Affiliation: | NRAO), P. Solomon (SUNY - Stoney Brook), P. Vanden Bout (NRAO), F. Walter (NRAO), Alexandre Beelen, Pierre Cox (Paris-Sud), F. Bertoldi, K. M. Menten (MPIfR), Kate G. Isaak (Cardiff), C.J. Chandler (NRAO), A. Omont (IAP | | Abstract: | We present a search for HCN emission from four high redshift far infrared (IR) luminous galaxies. Current data and models suggest that these high $z$ IR luminous galaxies represent a major starburst phase in the formation of spheroidal galaxies, although many of the sources also host luminous active galactic nuclei (AGN), such that a contribution to the dust heating by the AGN cannot be precluded. HCN emission is a star formation indicator, tracing dense molecular hydrogen gas within star-forming molecular clouds (n(H$_2$) $sim 10^5$ cm$^{-3}$). HCN luminosity is linearly correlated with IR luminosity for low redshift galaxies, unlike CO emission which can also trace gas at much lower density. We report a marginal detection of HCN (1-0) emission from the $z=2.5832$ QSO J1409+5628, with a velocity integrated line luminosity of $L_{
m HCN}’=6.7pm2.2 imes10^{9}$ K km s$^{-1}$ pc$^2$, while we obtain 3$sigma$ upper limits to the HCN luminosity of the $z=3.200$ QSO J0751+2716 of $L_{
m HCN}’=1.0 imes10^{9}$ K km s$^{-1}$ pc$^2$, $L_{
m HCN}’=1.6 imes10^{9}$ K km s$^{-1}$ pc$^2$ for the $z= 2.565$ starburst galaxy J1401+0252, and $L_{
m HCN}’=1.0 imes10^{10}$ K km s$^{-1}$ pc$^2$ for the $z = 6.42$ QSO J1148+5251. We compare the HCN data on these sources, plus three other high-$z$ IR luminous galaxies, to observations of lower redshift star-forming galaxies. The values of the HCN/far-IR luminosity ratios (or limits) for all the high $z$ sources are within the scatter of the relationship between HCN and far-IR emission for low $z$ star-forming galaxies (truncated). | | Source: | arXiv, astro-ph/0409054 | | Services: | Forum | Review | PDF | Favorites | |
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