A dataset provided by the European Space Agency

Name OT2_rmaiolin_1
Title Mass-metallicity relation of infrared-luminous galaxies assessed by extinction-free metallicity diagnostics
URL

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DOI 10.5270/esa-y1zigco
Author maiolino, r.
Description LIRGs and ULIRGs are found to deviate strongly from the mass-metallicity relation. More specifically, at a given stellar mass, the metallicity of LIRGs and ULIRGs, as inferred from optical spectroscopy, is much lower than the value expected from the mass-metallicity relation observed in normal star-forming galaxies. This "metallicity anomaly" of LIRGs and ULIRGs has been ascribed, by many models, to the inflow of metal poor gas, from the galaxy outskirts, induced by the tidal forces associated with these merging systems. However, an alternative possible scenario is that in these dusty systems optical spectra only probe the outer, metal poor regions, while the bulk of the gas is actually metal rich, but it is heavily absorbed by dust. We propose a definitive test of the scenarios discussed above by obtaining an independent, extinction-free measurement of the gas metallicity in a sample of LIRGs-ULIRGs, by exploiting newly developed far-IR metallicity diagnostics. In particular, we have recently shown that by measuring the relative intensities of the fine structure lines [OIII]52um, [OIII]88um, [NIII]57um and [NII]122um, it is possible to constrain the gas metallicity with high accuracy and in a wavelength range nearly unaffected by dust extinction. If these far-IR diagnostics confirm the low metallicities observed in the optical spectra, this would support models envisaging inflow of metal poor gas in interacting systems. If, instead, the far-IR diagnostics measure much higher metallicities, this would favor the scenario where the bulk of the gas is metal rich, but heavily absorbed, and it has been elusive to optical observations.
Publication
Instrument PACS_PacsLineSpec_point
Temporal Coverage 2012-05-07T21:16:32Z/2012-10-21T00:24:29Z
Version SPG v14.2.0
Mission Description Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 ┬Ám range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/herschel/
Date Published 2013-04-20T23:35:16Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-04-20T23:35:16Z, OT2_rmaiolin_1, SPG v14.2.0. https://doi.org/10.5270/esa-y1zigco