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http://hdl.handle.net/20.500.12386/24823
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Dall'Osso, Simone | en_US |
dc.contributor.author | Perna, Rosalba | en_US |
dc.contributor.author | PAPITTO, ALESSANDRO | en_US |
dc.contributor.author | Bozzo, Enrico | en_US |
dc.contributor.author | STELLA, Luigi | en_US |
dc.date.accessioned | 2020-05-14T14:28:53Z | - |
dc.date.available | 2020-05-14T14:28:53Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/24823 | - |
dc.description.abstract | The ultraluminous accreting pulsar M82-X2 (NuSTAR J095551+6940.8) offers an unprecedented opportunity to study the disc-magnetosphere interaction in a new regime of supercritical accretion. The source X-ray emission has been highly variable during the last 15 yrs. It ranged from a maximum of ∼2 × 10<SUP>40</SUP> erg s<SUP>-1</SUP> through intermediate values ∼ a few × 10<SUP>39</SUP> erg s<SUP>-1</SUP>, and down to a minimum below 2 × 10<SUP>38</SUP> erg s<SUP>-1</SUP> that we have determined here, by analysing archival Chandra HRC observations of the source at an epoch at which it was undetected. We interpret the source variability via a magnetically threaded disc model: when at peak luminosity, the neutron star (NS) is close to spin equilibrium, its inner disc edge r<SUB>m</SUB> ∼ 10<SUP>8</SUP> cm is approximately half the corotation radius r<SUB>co</SUB>, and radiation pressure dominates the disc out to r<SUB>tr</SUB> ≲ 10<SUP>9</SUP> cm. In the radiation-pressure-dominated regime, r<SUB>m</SUB> grows very slowly as the mass inflow rate drops: as a result, r<SUB>m</SUB> < r<SUB>co</SUB> remains valid until dot{M} ≳dot{M}_E, the Eddington accretion rate, allowing a wide range of accretion luminosities to the NS. Once dot{M} < dot{M}_E accretion on to the NS is inhibited because r<SUB>m</SUB> > r<SUB>co</SUB>, and the source luminosity is expected to drop by a large factor. We conclude that a magnetically threaded accretion disc surrounding a highly magnetized NS (B ≲ 10<SUP>13</SUP> G), and transitioning between the radiation-pressure and gas-pressure dominated regimes, offers the best interpretation for all the currently observed properties of NuSTAR J095551+6940.8. | en_US |
dc.language.iso | eng | en_US |
dc.title | The accretion regimes of a highly magnetized NS: the unique case of NuSTAR J095551+6940.8 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stw110 | en_US |
dc.identifier.scopus | 2-s2.0-84976892782 | en_US |
dc.identifier.isi | 000373583900060 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/457/3/3076/2588907 | en_US |
dc.identifier.url | https://arxiv.org/abs/1512.01532 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 457 | en_US |
dc.relation.issue | 3 | en_US |
dc.relation.firstpage | 3076 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 5 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | 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.457.3076D | en_US |
dc.relation.ercsector | Scienze Fisiche Settori ERC (ERC) di riferimento::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_10 High energy and particle astronomy – X-rays, cosmic rays, gamma rays, neutrinos | 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. Roma | - |
crisitem.author.dept | O.A. Roma | - |
crisitem.author.orcid | 0000-0001-6289-7413 | - |
crisitem.author.orcid | 0000-0002-0018-1687 | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
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