Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/27438
Titolo: | New ATCA, ALMA and VISIR observations of the candidate LBV SK -67 266 (S61): the nebular mass from modelling 3D density distributions | Autori: | Agliozzo, C. Nikutta, R. Pignata, G. Phillips, N. M. INGALLINERA, Adriano BUEMI, CARLA SIMONA UMANA, Grazia Maria Gloria LETO, PAOLO TRIGILIO, CORRADO Noriega-Crespo, A. Paladini, R. Cavallaro, Francesco Cavallaro, F. |
Data pubblicazione: | 2017 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 466 | Fascicolo: | 1 | Da pagina:: | 213 | Abstract: | We present new observations of the nebula around the Magellanic candidate Luminous Blue Variable S61. These comprise high-resolution data acquired with the Australia Telescope Compact Array (ATCA), the Atacama Large Millimetre/Submillimetre Array (ALMA), and the VLT Imager and Spectrometer for mid Infrared (VISIR) at the Very Large Telescope. The nebula was detected only in the radio, up to 17 GHz. The 17 GHz ATCA map, with 0.8 arcsec resolution, allowed a morphological comparison with the Hα Hubble Space Telescope image. The radio nebula resembles a spherical shell, as in the optical. The spectral index map indicates that the radio emission is due to free-free transitions in the ionized, optically thin gas, but there are hints of inhomogeneities. We present our new public code RHOCUBE to model 3D density distributions and determine via Bayesian inference the nebula's geometric parameters. We applied the code to model the electron density distribution in the S61 nebula. We found that different distributions fit the data, but all of them converge to the same ionized mass, ∼ 0.1 M<SUB>☉</SUB>, which is an order of magnitude smaller than previous estimates. We show how the nebula models can be used to derive the mass-loss history with high-temporal resolution. The nebula was probably formed through stellar winds, rather than eruptions. From the ALMA and VISIR non-detections, plus the derived extinction map, we deduce that the infrared emission observed by space telescopes must arise from extended, diffuse dust within the ionized region. | URI: | http://hdl.handle.net/20.500.12386/27438 | URL: | https://academic.oup.com/mnras/article/466/1/213/2544389 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw2986 | Bibcode ADS: | 2017MNRAS.466..213A | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
File in questo documento:
File | Descrizione | Dimensioni | Formato | |
---|---|---|---|---|
stw2986.pdf | Pdf editoriale | 2.89 MB | Adobe PDF | Visualizza/apri |
Page view(s)
54
controllato il 11-set-2024
Download(s)
37
controllato il 11-set-2024
Google ScholarTM
Check
Altmetric
Altmetric
Tutti i documenti in DSpace sono pubblicati ad Accesso Aperto, salvo diversa indicazione per alcuni documenti specifici.