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http://hdl.handle.net/20.500.12386/24671
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Thuan, T. X. | en_US |
dc.contributor.author | Goehring, K. M. | en_US |
dc.contributor.author | Hibbard, J. E. | en_US |
dc.contributor.author | Izotov, Y. I. | en_US |
dc.contributor.author | HUNT, Leslie Kipp | en_US |
dc.date.accessioned | 2020-05-08T16:05:47Z | - |
dc.date.available | 2020-05-08T16:05:47Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/24671 | - |
dc.description.abstract | We have obtained new H I observations with the 100 m Green Bank Telescope (GBT) for a sample of 29 extremely metal-deficient star-forming blue compact dwarf (BCD) galaxies, selected from the Sloan Digital Sky Survey (SDSS) spectral data base to be extremely metal-deficient (12 + log O/H ≤ 7.6). Neutral hydrogen was detected in 28 galaxies, a 97 per cent detection rate. Combining the H I data with SDSS optical spectra for the BCD sample and adding complementary galaxy samples from the literature to extend the metallicity and mass ranges, we have studied how the H I content of a galaxy varies with various global galaxian properties. There is a clear trend of increasing gas mass fraction with decreasing metallicity, mass and luminosity. We obtain the relation M(H I)/L<SUB>g</SUB>∝ L_g^{-0.3}, in agreement with previous studies based on samples with a smaller luminosity range. The median gas mass fraction f<SUB>gas</SUB> for the GBT sample is equal to 0.94 while the mean gas mass fraction is 0.90±0.15, with a lower limit of ∼0.65. The H I depletion time is independent of metallicity, with a large scatter around the median value of 3.4 Gyr. The ratio of the baryonic mass to the dynamical mass of the metal-deficient BCDs varies from 0.05 to 0.80, with a median value of ∼0.2. About 65 per cent of the BCDs in our sample have an effective yield larger than the true yield, implying that the neutral gas envelope in BCDs is more metal-deficient by a factor of 1.5-20, as compared to the ionized gas. | en_US |
dc.language.iso | eng | en_US |
dc.title | The H I content of extremely metal-deficient blue compact dwarf galaxies | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stw2259 | en_US |
dc.identifier.scopus | 2-s2.0-85019766424 | en_US |
dc.identifier.isi | 000393568200058 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/463/4/4268/2646502 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 463 | en_US |
dc.relation.issue | 4 | en_US |
dc.relation.firstpage | 4268 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 5 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | USA | 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 | 2016MNRAS.463.4268T | 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.grantfulltext | open | - |
item.cerifentitytype | Publications | - |
item.openairetype | Article | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.languageiso639-1 | en | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.orcid | 0000-0001-9162-2371 | - |
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2016MNRAS.463.4268Thuan.pdf | PDF editoriale | 2.7 MB | Adobe PDF | Visualizza/apri |
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