ALMA CO(3-2) Observations of Star-forming Filaments in a Gas-poor Dwarf Spheroidal Galaxy
We report ALMA observations of 12CO(3-2) and 13CO(3-2) in the gas-poor dwarf galaxy NGC 5253. These 0 3(5.5 pc) resolution images reveal small, dense molecular gas clouds that are located in kinematically distinct extended filaments. Some of the filaments appear to be falling into the galaxy and may...
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| Veröffentlicht in: | The Astrophysical journal 2017-11, Vol.850 (1), p.54 |
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| creator | Consiglio, S. Michelle Turner, Jean L. Beck, Sara Meier, David S. Silich, Sergiy Zhao, Jun-Hui |
| description | We report ALMA observations of 12CO(3-2) and 13CO(3-2) in the gas-poor dwarf galaxy NGC 5253. These 0 3(5.5 pc) resolution images reveal small, dense molecular gas clouds that are located in kinematically distinct extended filaments. Some of the filaments appear to be falling into the galaxy and may be fueling its current star formation. The most intense CO(3-2) emission comes from the central ∼100 pc region centered on the luminous radio-infrared H ii region known as the supernebula. The CO(3-2) clumps within the starburst region are anti-correlated with H on ∼5 pc scales, but are well-correlated with radio free-free emission. Cloud D1, which enshrouds the supernebula, has a high 12CO/13CO ratio, as does another cloud within the central 100 pc starburst region, possibly because the clouds are hot. CO(3-2) emission alone does not allow determination of cloud masses as molecular gas temperature and column density are degenerate at the observed brightness, unless combined with other lines such as 13CO. |
| doi_str_mv | 10.3847/1538-4357/aa93dc |
| format | Article |
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Michelle ; Turner, Jean L. ; Beck, Sara ; Meier, David S. ; Silich, Sergiy ; Zhao, Jun-Hui</creator><creatorcontrib>Consiglio, S. Michelle ; Turner, Jean L. ; Beck, Sara ; Meier, David S. ; Silich, Sergiy ; Zhao, Jun-Hui</creatorcontrib><description>We report ALMA observations of 12CO(3-2) and 13CO(3-2) in the gas-poor dwarf galaxy NGC 5253. These 0 3(5.5 pc) resolution images reveal small, dense molecular gas clouds that are located in kinematically distinct extended filaments. Some of the filaments appear to be falling into the galaxy and may be fueling its current star formation. The most intense CO(3-2) emission comes from the central ∼100 pc region centered on the luminous radio-infrared H ii region known as the supernebula. The CO(3-2) clumps within the starburst region are anti-correlated with H on ∼5 pc scales, but are well-correlated with radio free-free emission. Cloud D1, which enshrouds the supernebula, has a high 12CO/13CO ratio, as does another cloud within the central 100 pc starburst region, possibly because the clouds are hot. 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The CO(3-2) clumps within the starburst region are anti-correlated with H on ∼5 pc scales, but are well-correlated with radio free-free emission. Cloud D1, which enshrouds the supernebula, has a high 12CO/13CO ratio, as does another cloud within the central 100 pc starburst region, possibly because the clouds are hot. CO(3-2) emission alone does not allow determination of cloud masses as molecular gas temperature and column density are degenerate at the observed brightness, unless combined with other lines such as 13CO.</description><subject>Astrophysics</subject><subject>Clouds</subject><subject>Clumps</subject><subject>Dwarf galaxies</subject><subject>Emission</subject><subject>Filaments</subject><subject>galaxies: dwarf</subject><subject>galaxies: individual (NGC 5253)</subject><subject>galaxies: star clusters: general</subject><subject>galaxies: starburst</subject><subject>Gas temperature</subject><subject>Molecular gases</subject><subject>Spheroidal galaxies</subject><subject>Star & galaxy formation</subject><subject>Star formation</subject><subject>Stars & galaxies</subject><subject>submillimeter: galaxies</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNp1kMFLwzAUxoMoOKd3jwE9KBiXNE3THsd0U5jsoIKewmuTaMfW1KRT99_bUtGLnh7ve7_ve_AhdMzoJU9jOWKCpyTmQo4AMq6LHTT4kXbRgFIak4TLp310EMKyW6MsG6Dn8fxujCeLM06ic7zIg_Hv0JSuCthZfN-AJ9b5dVm94Gm5grWpmoDLCgOeQSC1cx5ffYBv0frVeFdqWLWXFXxuD9GehVUwR99ziB6n1w-TGzJfzG4n4zkpuMwaIjS3OuIigdxozQopI5OwTIpcg02EaEXLIprmWZFKag3LI6YN03libUFtwYfopM-tvXvbmNCopdv4qn2pIp6IVCYsjVuK9lThXQjeWFX7cg1-qxhVXYGqa0t1bam-wNZy2ltKV_9mQr1UqaCKKRGrWtsWu_gD-zf1C7F1fiI</recordid><startdate>20171120</startdate><enddate>20171120</enddate><creator>Consiglio, S. 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| subjects | Astrophysics Clouds Clumps Dwarf galaxies Emission Filaments galaxies: dwarf galaxies: individual (NGC 5253) galaxies: star clusters: general galaxies: starburst Gas temperature Molecular gases Spheroidal galaxies Star & galaxy formation Star formation Stars & galaxies submillimeter: galaxies |
| title | ALMA CO(3-2) Observations of Star-forming Filaments in a Gas-poor Dwarf Spheroidal Galaxy |
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