An ALMA Spectral Scan of the Obscured Luminous Infrared Galaxy NGC 4418
Paper i proceeding, 2015

Until recently, the study of the molecular interstellar medium of galaxies has been mostly focused on a few, relatively abundant, molecular species. Recent attempts at modeling the molecular emission of active galaxies have shown that standard high-density tracers do not provide univocal results and are not able to discriminate between different relevant environments (e.g., star-formation vs AGN). Spectral lines surveys allow us to explore the richness of the molecular spectrum of galaxies, provide tighter constrains to astrochemical models, and find new more sensitive tracers of specific gas properties. What started as a time-consuming pioneering work has become now routinely accessible with the advent of ALMA. Here we report the results of the first ALMA spectral scan of an obscured luminous infrared galaxy (LIRG), NGC 4418. The galaxy has a very compact IR core and narrow emission lines that make it the perfect target for the study of vibrationally excited molecules. More than 300 emission lines from 45 molecular species were identified and modeled via an LTE and NLTE analysis. The molecular excitation and abundances derived offer a unique insight into the chemistry of obscured LIRGs.

Författare

Francesco Costagliola

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

K. Sakamoto

Susanne Aalto

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

Sebastien Muller

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

S. Martin

4th ALMA Science Conference on Revolution in Astronomy with ALMA: The Third Year, Tokyo, Japan, 8-11 December

Vol. 499 95-98
978-1-58381-883-1 (ISBN)

Ämneskategorier

Astronomi, astrofysik och kosmologi

Infrastruktur

Onsala rymdobservatorium

ISBN

978-1-58381-883-1

Mer information

Skapat

2017-10-07