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http://hdl.handle.net/20.500.12386/29748
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Coogan, R. T. | en_US |
dc.contributor.author | Sargent, M. T. | en_US |
dc.contributor.author | Daddi, E. | en_US |
dc.contributor.author | Valentino, F. | en_US |
dc.contributor.author | STRAZZULLO, VERONICA | en_US |
dc.contributor.author | Béthermin, M. | en_US |
dc.contributor.author | Gobat, R. | en_US |
dc.contributor.author | Liu, D. | en_US |
dc.contributor.author | Magdis, G. | en_US |
dc.date.accessioned | 2021-01-13T15:16:27Z | - |
dc.date.available | 2021-01-13T15:16:27Z | - |
dc.date.issued | 2019 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/29748 | - |
dc.description.abstract | We study a population of significantly sub-solar enrichment galaxies at z = 1.99, to investigate how molecular gas, dust, and star formation relate in low-metallicity galaxies at the peak epoch of star formation. We target our sample with several deep Atacama Large Millimeter/submillimeter Array and Very Large Array datasets, and find no individual detections of CO[4-3], CO[1-0], or dust, in stark contrast to the >60 per cent detection rate expected for solar-enrichment galaxies with these MS H α star formation rates (SFRs). We find that both low- and high-density molecular gas (traced by CO[1-0] and CO[4-3], respectively) are affected by the low enrichment, showing sample average (stacked) luminosity deficits >0.5-0.7 dex below expectations. This is particularly pertinent for the use of high-J CO emission as a proxy of instantaneous SFR. Our individual galaxy data and stacked constraints point to a strong inverse dependence ∝ Z<SUP>γ</SUP> of gas-to-dust ratios (G/D) and CO-to-H<SUB>2</SUB> conversion factors (α<SUB>CO</SUB>) on metallicity at z ∼ 2, with γ<SUB>G/D</SUB> <-2.2 and γ _{α _CO}< -0.8, respectively. We quantify the importance of comparing G/D and α<SUB>CO</SUB> versus metallicity trends from the literature on a common, suitably normalized metallicity scale. When accounting for systematic offsets between different metallicity scales, our z ∼ 2 constraints on these scaling relations are consistent with the corresponding relations for local galaxies. However, among those local relations, we favour those with a steep/double power-law dependence of G/D on metallicity. Finally, we discuss the implications of these findings for (a) gas mass measurements for sub-M* galaxies, and (b) efforts to identify the characteristic galaxy mass scale contributing most to the comoving molecular gas density at z = 2. | en_US |
dc.language.iso | eng | en_US |
dc.title | Suppressed CO emission and high G/D ratios in z = 2 galaxies with sub-solar gas-phase metallicity | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stz409 | en_US |
dc.identifier.scopus | 2-s2.0-85067027911 | en_US |
dc.identifier.isi | 000474886200044 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/485/2/2092/5315777 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 485 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 2092 | en_US |
dc.type.referee | REF_1 | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2019MNRAS.485.2092C | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_6 Stars and stellar systems | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Trieste | - |
crisitem.author.orcid | 0000-0001-7975-2894 | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
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stz409.pdf | PDF editoriale | 1.4 MB | Adobe PDF | Visualizza/apri |
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