Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/31829
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Issaoun, S. | en_US |
dc.contributor.author | Johnson, M. D. | en_US |
dc.contributor.author | Blackburn, L. | en_US |
dc.contributor.author | Broderick, A. | en_US |
dc.contributor.author | Tiede, P. | en_US |
dc.contributor.author | Wielgus, M. | en_US |
dc.contributor.author | Doeleman, S. S. | en_US |
dc.contributor.author | Falcke, H. | en_US |
dc.contributor.author | Akiyama, K. | en_US |
dc.contributor.author | Bower, G. C. | en_US |
dc.contributor.author | Brinkerink, C. D. | en_US |
dc.contributor.author | Chael, A. | en_US |
dc.contributor.author | Cho, I. | en_US |
dc.contributor.author | Gómez, J. L. | en_US |
dc.contributor.author | Hernández-Gómez, A. | en_US |
dc.contributor.author | Hughes, D. | en_US |
dc.contributor.author | Kino, M. | en_US |
dc.contributor.author | Krichbaum, T. P. | en_US |
dc.contributor.author | LIUZZO, Elisabetta Teodorina | en_US |
dc.contributor.author | Loinard, L. | en_US |
dc.contributor.author | Markoff, S. | en_US |
dc.contributor.author | Marrone, D. P. | en_US |
dc.contributor.author | Mizuno, Y. | en_US |
dc.contributor.author | Moran, J. M. | en_US |
dc.contributor.author | Pidopryhora, Y. | en_US |
dc.contributor.author | Ros, E. | en_US |
dc.contributor.author | RYGL, Kazi Lucie Jessica | en_US |
dc.contributor.author | Shen, Z. -Q. | en_US |
dc.contributor.author | Wagner, J. | en_US |
dc.date.accessioned | 2022-03-24T08:46:58Z | - |
dc.date.available | 2022-03-24T08:46:58Z | - |
dc.date.issued | 2021 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/31829 | - |
dc.description.abstract | Observations of the Galactic Center supermassive black hole Sagittarius A* (Sgr A*) with very long-baseline interferometry (VLBI) are affected by interstellar scattering along our line of sight. At long radio observing wavelengths (≲1 cm), the scattering heavily dominates image morphology. At 3.5 mm (86 GHz), the intrinsic source structure is no longer sub-dominant to scattering, and thus the intrinsic emission from Sgr A* is resolvable with the Global Millimeter VLBI Array (GMVA). Long-baseline detections to the phased Atacama Large Millimeter/submillimeter Array (ALMA) in 2017 provided new constraints on the intrinsic and scattering properties of Sgr A*, but the stochastic nature of the scattering Requires multiple observing epochs to reliably estimate its statistical properties. We present new observations with the GMVA+ALMA, taken in 2018, which confirm non-Gaussian structure in the scattered image seen in 2017. In particular, the ALMA-GBT baseline shows more flux density than expected for an anistropic Gaussian model, providing a tight constraint on the source size and an upper limit on the dissipation scale of interstellar turbulence. We find an intrinsic source extent along the minor axis of ~100 μas both via extrapolation of longer wavelength scattering constraints and direct modeling of the 3.5 mm observations. Simultaneously fitting for the scattering parameters, we find an at-most modestly asymmetrical (major-to-minor axis ratio of 1.5 ± 0.2) intrinsic source morphology for Sgr A*. | en_US |
dc.language.iso | eng | en_US |
dc.title | Persistent Non-Gaussian Structure in the Image of Sagittarius A* at 86 GHz | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/1538-4357/ac00b0 | en_US |
dc.identifier.scopus | 2-s2.0-85111100841 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/1538-4357/ac00b0 | en_US |
dc.identifier.url | https://api.elsevier.com/content/abstract/scopus_id/85111100841 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 915 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 99 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2021ApJ...915...99I | 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 | IRA Bologna | - |
crisitem.author.dept | IRA Bologna | - |
crisitem.author.orcid | 0000-0003-0995-5201 | - |
crisitem.author.orcid | 0000-0003-4146-9043 | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
2104.07610.pdf | preprint | 3.56 MB | Adobe PDF | View/Open |
Issaoun_2021_ApJ_915_99-1-7.pdf | [Administrators only] | 7.38 MB | Adobe PDF | |
Issaoun_2021_ApJ_915_99-8-14.pdf | [Administrators only] | 6.55 MB | Adobe PDF |
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