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http://hdl.handle.net/20.500.12386/29935
Campo DC | Valore | Lingua |
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dc.contributor.author | SANNA, ALBERTO | en_US |
dc.contributor.author | PAPITTO, ALESSANDRO | en_US |
dc.contributor.author | Burderi, L. | en_US |
dc.contributor.author | Bozzo, E. | en_US |
dc.contributor.author | Riggio, A. | en_US |
dc.contributor.author | Di Salvo, T. | en_US |
dc.contributor.author | Ferrigno, C. | en_US |
dc.contributor.author | Rea, N. | en_US |
dc.contributor.author | Iaria, R. | en_US |
dc.date.accessioned | 2021-01-21T19:07:29Z | - |
dc.date.available | 2021-01-21T19:07:29Z | - |
dc.date.issued | 2017 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/29935 | - |
dc.description.abstract | We report on the discovery of coherent pulsations at a period of 2.9 ms from the X-ray transient MAXI J0911-655 in the globular cluster NGC 2808. We observed X-ray pulsations at a frequency of 339.97 Hz in three different observations of the source performed with XMM-Newton and NuSTAR during the source outburst. This newly discovered accreting millisecond pulsar is part of an ultra-compact binary system characterised by an orbital period of 44.3 min and a projected semi-major axis of 17.6 lt-ms. Based on the mass function, we estimate a minimum companion mass of 0.024 M<SUB>☉</SUB>, which assumes a neutron star mass of 1.4 M<SUB>☉</SUB> and a maximum inclination angle of 75° (derived from the lack of eclipses and dips in the light-curve of the source). We find that the Roche-lobe of the companion star could either be filled by a hot (5 × 10<SUP>6</SUP> K) pure helium white dwarf with a 0.028 M<SUB>☉</SUB> mass (implying I ≃ 58°) or an old (>5 Gyr) brown dwarf with metallicity abundances between solar/sub-solar and mass ranging in the interval 0.065 to 0.085 (16 < I < 21). During the outburst, the broad-band energy spectra are well described by a superposition of a weak black-body component (kT 0.5 keV) and a hard cut-off power-law with photon index Γ 1.7 and cut-off at a temperature kT<SUB>e</SUB> 130 keV. Up until the latest Swift-XRT observation performed on 19th July, 2016, the source had been observed in outburst for almost 150 days, which makes MAXI J0911-655 the second accreting millisecond X-ray pulsar with outburst duration longer than 100 days. | en_US |
dc.language.iso | eng | en_US |
dc.title | Discovery of a new accreting millisecond X-ray pulsar in the globular cluster NGC 2808 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201629406 | en_US |
dc.identifier.scopus | 2-s2.0-85011105076 | en_US |
dc.identifier.isi | 000394465000034 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/abs/2017/02/aa29406-16/aa29406-16.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 598 | en_US |
dc.relation.firstpage | A34 | 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 | ASTRONOMY & ASTROPHYSICS | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2017A&A...598A..34S | en_US |
dc.relation.fund | H2020 | en_US |
dc.relation.project | TMSP (Mass accretion and ejection in transitional millisecond pulsars) | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::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.orcid | 0000-0001-6289-7413 | - |
crisitem.project.grantno | 660657 | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
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