Is there LFIR-LHCN correlation for low LFIR isolated galaxies?
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AuthorOcaña Flaquer, Breezy; Leon, S.; Espada, D.; Lisenfeld, Ute; Martín Ruiz, Sergio; Sabater, J.; Verdes-Montenegro, L.; Verley, S.
GalaxiesIsolatedMolecular gasStar formationPóster
Ocaña Flaquer, B.; et al. Is there LFIR-LHCN correlation for low LFIR isolated galaxies? [póster]. In: Conference "Galaxies in Isolation: exploring nature us nurture", Granada, may 12-15, 2009. [http://hdl.handle.net/10481/28424]
We observed HCN(1-0) in 15 well isolated galaxies where 9 galaxies were clearly detected. The aim of these observations is to confirm the relationship between the (dense) molecular gas and star formation (SF) activity through the correlation found by  between the FIR and HCN luminosity. We find that the detected galaxies in HCN(1-9) have a lower HCN luminosity than the expected from the FIR-HCN correlation. This departure from the correlation may be due to an extended emission of the HCN(1-0) line in the galaxies. To prove this we mapped 4 galaxies that were clearly detected in HCN(1-0) at the center of the galaxy to measure their spatial extension and to get a more precise measurement of the total HCN (1-0) luminosity. The HCN(1-0) luminosity was compared to the CO(1-0) luminosity finding a ratio that implies that de galaxies in the sample have a low level of activity.