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Spatially resolved dust-to-gas mass ratios in nearby galaxies

Published online by Cambridge University Press:  10 June 2020

Basilio Solís-Castillo  and
Marcus Albrecht
Basilio Solís-Castillo
Affiliation:
Argelander Institute for Astronomy, University of Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany email: [email protected] Max-Planck Institute for Radio Astronomy, Auf dem Hügel 69, D-53121 Bonn, Germany
Marcus Albrecht
Affiliation:
Argelander Institute for Astronomy, University of Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany email: [email protected]
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Abstract

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We analyse the dust-to-gas mass ratio (DGR) in nearby galaxies on kiloparsec scales. We focus on their dependence on metallicity and the CO-to-H2 conversion factor, αco. We use a sample of 25 nearby galaxies from SINGS and combine our data with CO (2-1) and H I observations from the HERACLES and THINGS surveys. We implement a Hierarchical Bayesian method to derive the dust mass via fitting the infrared data from 100 to 500 μm with a single modified blackbody. We find that the DGR-metallicity relation follows a power law and we study its strong dependency on the conversion factor αco. Our results indicate a strong connection between interstellar dust and gas. The resolved DGR-metallicity relation cannot be represented with a single power law. The scatter in this relation shows the strong impact of several processes that take place in every galaxy.

Keywords

evolution - dustextinction - galaxies: ISM - infrared: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S341: Challenges in Panchromatic Modelling with Next Generation Facilities , November 2019 , pp. 78 - 82
Copyright
© International Astronomical Union 2020

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