2018
DOI: 10.3847/2041-8213/aac6be
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NOEMA Observations of a Molecular Cloud in the Low-metallicity Galaxy Kiso 5639

Abstract: A giant star-forming region in a metal-poor dwarf galaxy has been observed in optical lines with the 10-m Gran Telescopio Canarias and in the emission line of CO(1-0) with the NOEMA mm-wave interferometer. The metallicity was determined to be 12 + log(O/H) = 7.83 ± 0.09, from which we estimate a conversion factor of α CO ∼ 100 M pc −2 K km s −1 −1 and a molecular cloud mass of ∼ 2.9 × 10 7 M . This is an enormous concentration of molecular mass at one end of a small galaxy, suggesting a recent accretion. The m… Show more

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Cited by 7 publications
(6 citation statements)
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References 39 publications
(45 reference statements)
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“…A key assumption here is that molecular clouds like Orion are the densest parts of a self-gravitating interstellar medium, i.e., with Toomre Q close to 1, and that the surrounding dark and atomic gas continues to be stratified up to the disk thickness because this lower-density gas is also part of the total interstellar gravity (Elmegreen & Elmegreen 1987;Grabelsky et al 1987;Elmegreen et al 2018). This juxtaposition of CO clouds inside larger HI clouds has been observed in nearby galaxies (Lada et al 1988;Corbelli et al 2018).…”
Section: Conversion From Cloud Core Pressure To Galaxy Gas Surface Dementioning
confidence: 99%
See 1 more Smart Citation
“…A key assumption here is that molecular clouds like Orion are the densest parts of a self-gravitating interstellar medium, i.e., with Toomre Q close to 1, and that the surrounding dark and atomic gas continues to be stratified up to the disk thickness because this lower-density gas is also part of the total interstellar gravity (Elmegreen & Elmegreen 1987;Grabelsky et al 1987;Elmegreen et al 2018). This juxtaposition of CO clouds inside larger HI clouds has been observed in nearby galaxies (Lada et al 1988;Corbelli et al 2018).…”
Section: Conversion From Cloud Core Pressure To Galaxy Gas Surface Dementioning
confidence: 99%
“…Most local starburst dwarfs have lopsided HI (Lelli et al 2014). A major gas impact is suspected also in the dwarf "tadpole" galaxy Kiso 5639, which has a molecular cloud at one end with a gas mass comparable to the total stellar mass in the whole disk, and is currently forming 14 young star clusters more massive than 10 4 M ⊙ (Elmegreen et al 2016(Elmegreen et al , 2018. Mrk 930 is another starburst dwarf with a high formation efficiency for clusters (Adamo et al 2011) and NGC 1705 has a YMC with no evidence for an impact or merger.…”
Section: Introductionmentioning
confidence: 99%
“…Atomic gas concentrations away from the galaxy centres towards GRB/SN positions suggest an external origin of the gas (Micha lowski et al , 2016(Micha lowski et al , 2018a, and a potential deficiency in molecular gas (Hatsukade et al 2014;Stanway et al 2015;Micha lowski et al 2016Micha lowski et al , 2018b. Studying gas inflows in such a direct way is important because they are required to fuel star formation in all galaxies, as implied from observations (Sancisi et al 2008;Sánchez Almeida et al 2014;Spring & Micha lowski 2017;Elmegreen et al 2018;Combes 2018) and simulations (Schaye et al 2010;van de Voort et al 2012;Narayanan et al 2015). Recently Thöne et al (2019) also suggested that in GRB hosts gas outflows are very common.…”
Section: Introductionmentioning
confidence: 99%
“…Therefore it is still unclear whether it is feasible to use [C ii] to trace H 2 gas. Substantial efforts have been made to search for the molecular gas in metal-poor galaxies (Rubio et al 2015;Oey et al 2017;Schruba et al 2017;Elmegreen et al 2018); nevertheless, among the galaxies below 10% Z , only Sextans B (7% Z ) has a robust CO detection (Shi et al 2016(Shi et al , 2020. The impact of low metal abundance on star formation requires further exploration of the most metal-poor galaxies.…”
Section: Introductionmentioning
confidence: 99%