DUST-TO-GAS RATIO IN THE EXTREMELY METAL-POOR GALAXY I Zw 18

Rodrigo Herrera-Camus; David B. Fisher; Alberto D. Bolatto; Adam K. Leroy; Fabian Walter; Karl. D. Gordon; Julia Roman-Duval; Jessica Donaldson; Marcio Melendez; John M. Cannon

doi:10.1088/0004-637X/752/2/112

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DUST-TO-GAS RATIO IN THE EXTREMELY METAL-POOR GALAXY I Zw 18

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DUST-TO-GAS RATIO IN THE EXTREMELY METAL-POOR GALAXY I Zw 18

Rodrigo Herrera-Camus, David B. Fisher, Alberto D. Bolatto, Adam K. Leroy, Fabian Walter, Karl. D. Gordon, Julia Roman-Duval, Jessica Donaldson, Marcio Melendez and John M. Cannon

The Astrophysical journal, Vol.752(2), pp.1-8

06/20/2012

DOI: 10.1088/0004-637X/752/2/112

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Abstract

The blue compact dwarf galaxy I Zw 18 is one of the most metal-poor systems known in the local universe (12+log(O/H) = 7.17). In this work we study I Zw 18 using data from Spitzer, Herschel Space Telescope, and IRAM Plateau de Bure Interferometer. Our data set includes the most sensitive maps of I Zw 18, to date, in both the far-infrared and the CO J = 1 -> 0 transition. We use dust emission models to derive a dust mass upper limit of only M-dust <= 1.1 x 10(4) M-circle dot (3 sigma limit). This upper limit is driven by the non-detection at 160 mu m, and it is a factor of 4-10 times smaller than previous estimates (depending on the model used). We also estimate an upper limit to the total dust-to-gas mass ratio of M-Dust/M-gas <= 5.0 x 10(-5). If a linear correlation between the dust-to-gas mass ratio and metallicity (measured as O/H) were to hold, we would expect a ratio of 3.9 x 10(-4). We also show that the infrared spectral energy distribution is similar to that of starbursting systems.

Astronomy & Astrophysics

Physical Sciences

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Details

Title: Subtitle: DUST-TO-GAS RATIO IN THE EXTREMELY METAL-POOR GALAXY I Zw 18
Creators: Rodrigo Herrera-Camus - University of Maryland, College Park
David B. Fisher - University of Maryland, College Park
Alberto D. Bolatto - University of Maryland, College Park
Adam K. Leroy - National Radio Astronomy Observatory
Fabian Walter - Max Planck Institute for Astronomy
Karl. D. Gordon - Space Telescope Science Institute
Julia Roman-Duval - Space Telescope Science Institute
Jessica Donaldson - University of Maryland, College Park
Marcio Melendez - University of Maryland, College Park
John M. Cannon - Macalester College
Resource Type: Journal article
Publication Details: The Astrophysical journal, Vol.752(2), pp.1-8
DOI: 10.1088/0004-637X/752/2/112
ISSN: 0004-637X
eISSN: 1538-4357
Publisher: Iop Publishing Ltd
Number of pages: 8
Grant note: IGN (Spain) AST-0838178; AST-0955836 / NSF; National Science Foundation (NSF) MPG (Germany); Max Planck Society JPL-1314022 / NASA; National Aeronautics & Space Administration (NASA) INSU/CNRS (France); Centre National de la Recherche Scientifique (CNRS) Cottrell Scholar award from the RCSA
Language: English
Date published: 06/20/2012
Academic Unit: Physics and Astronomy
Record Identifier: 9984627299402771

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