%0 Generic %1 herreracamus2012dusttogas %A Herrera-Camus, Rodrigo %A Fisher, David B. %A Bolatto, Alberto D. %A Leroy, Adam K. %A Walter, Fabian %A Gordon, Karl. D. %A Roman-Duval, Julia %A Donaldson, Jessica %A Meléndez, Marcio %A Cannon, John M. %D 2012 %K dust gas metal poor ratio %T Dust-to-Gas Ratio in the Extremely Metal Poor Galaxy I ZW 18 %U http://arxiv.org/abs/1204.4745 %X 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 $J=1\rightarrow0$ transition. We use dust emission models to derive a dust mass upper limit of only M$_dustłeq1.1\times10^4$ M$_ødot$ ($3\sigma$ 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 upon the model used). We also estimate an upper limit to the total dust-to-gas mass ratio of M$_Dust$/M$_gasłeq5.0\times10^-5$. If a linear correlation between the dust-to-gas mass ratio and metallicity (measure as O/H) were to hold, we would expect a ratio of 3.9$\times10^-4$. We also show that the infrared SED is similar to that of starbursting systems.

@misc{herreracamus2012dusttogas, 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 {\it Spitzer}, {\it 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 $J=1\rightarrow0$ transition. We use dust emission models to derive a dust mass upper limit of only M$_{dust}\leq1.1\times10^4$ M$_{\odot}$ ($3\sigma$ 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 upon the model used). We also estimate an upper limit to the total dust-to-gas mass ratio of M$_{Dust}$/M$_{gas}\leq5.0\times10^{-5}$. If a linear correlation between the dust-to-gas mass ratio and metallicity (measure as O/H) were to hold, we would expect a ratio of 3.9$\times10^{-4}$. We also show that the infrared SED is similar to that of starbursting systems.}, added-at = {2012-04-24T04:38:15.000+0200}, author = {Herrera-Camus, Rodrigo and Fisher, David B. and Bolatto, Alberto D. and Leroy, Adam K. and Walter, Fabian and Gordon, Karl. D. and Roman-Duval, Julia and Donaldson, Jessica and Meléndez, Marcio and Cannon, John M.}, biburl = {https://www.bibsonomy.org/bibtex/293fe9babfd0e3620f0d0ceeeebe29a13/miki}, description = {[1204.4745] Dust-to-Gas Ratio in the Extremely Metal Poor Galaxy I ZW 18}, interhash = {1e34bdef3d0fb1964d62838544d1f4e4}, intrahash = {93fe9babfd0e3620f0d0ceeeebe29a13}, keywords = {dust gas metal poor ratio}, note = {cite arxiv:1204.4745Comment: Accepted for publication in ApJ: 8 pages, 4 figures, 1 table}, timestamp = {2012-04-24T04:38:15.000+0200}, title = {Dust-to-Gas Ratio in the Extremely Metal Poor Galaxy I ZW 18}, url = {http://arxiv.org/abs/1204.4745}, year = 2012 }