| DOI | Trouver le DOI : https://doi.org/10.3847/1538-4365/abf4d4 |
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| Auteur | Rechercher : Wenger, Trey V.1Identifiant ORCID : https://orcid.org/0000-0003-0640-7787; Rechercher : Dawson, J. R.Identifiant ORCID : https://orcid.org/0000-0003-0235-3347; Rechercher : Dickey, John M.1Identifiant ORCID : https://orcid.org/0000-0002-6300-7459; Rechercher : Jordan, C. H.Identifiant ORCID : https://orcid.org/0000-0002-1220-2940; Rechercher : McClure–Griffiths, N. M.Identifiant ORCID : https://orcid.org/0000-0003-2730-957X; Rechercher : Anderson, L. D.Identifiant ORCID : https://orcid.org/0000-0001-8800-1793; Rechercher : Armentrout, W. P.Identifiant ORCID : https://orcid.org/0000-0002-7045-9277; Rechercher : Balser, Dana S.Identifiant ORCID : https://orcid.org/0000-0002-2465-7803; Rechercher : Bania, T. M.Identifiant ORCID : https://orcid.org/0000-0003-4866-460X |
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| Affiliation | - Conseil national de recherches du Canada. Herzberg en astronomie et en astrophysique
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| Bailleur de fonds | Rechercher : National Science Foundation; Rechercher : National Science Foundation; Rechercher : Australian Research Council |
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| Format | Texte, Article |
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| Sujet | H II regions; surveys; radio spectroscopy; radio continuum emission; galaxy structure; Milky Way dynamics; Milky Way galaxy; interstellar medium |
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| Résumé | The Southern H ii Region Discovery Survey (SHRDS) is a 900 hr Australia Telescope Compact Array 4–10 GHz radio continuum and radio recombination line (RRL) survey of Galactic H ii regions and infrared-identified H ii region candidates in the southern sky. For this data release, we reprocess all previously published SHRDS data and include an additional ∼450 hr of observations. The search for new H ii regions is now complete over the range 259° < ℓ < 346°, ∣b∣ < 4° for H ii region candidates with predicted 6 GHz continuum peak brightnesses ≳30 mJy beam⁻¹. We detect radio continuum emission toward 730 targets altogether including previously known nebulae and H ii region candidates. By averaging ∼18 RRL transitions, we detect RRL emission toward 206 previously known H ii regions and 436 H ii region candidates. Including the northern sky surveys, over the last decade the H ii Region Discovery Surveys have more than doubled the number of known Galactic H ii regions. The census of H ii regions in the Wide-field Infrared Survey Explorer (WISE) Catalog of Galactic H ii Regions is now complete for nebulae with 9 GHz continuum flux densities ≳250 mJy. We compare the RRL properties of the newly discovered SHRDS nebulae with those of all previously known H ii regions. The median RRL FWHM line width of the entire WISE Catalog H ii region population is 23.9 km s⁻¹ and is consistent between Galactic quadrants. The observed Galactic longitude–velocity asymmetry in the population of H ii regions probably reflects underlying spiral structure in the Milky Way. |
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| Date de publication | 2021-06-07 |
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| Maison d’édition | IOP |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | d628ca32-48e4-41c8-8c07-1d9171e2f578 |
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| Enregistrement créé | 2023-05-11 |
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| Enregistrement modifié | 2023-05-11 |
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