Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/29951
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Pintore, Fabio | en_US |
dc.contributor.author | MARELLI, MARTINO | en_US |
dc.contributor.author | SALVATERRA, Ruben | en_US |
dc.contributor.author | ISRAEL, Gian Luca | en_US |
dc.contributor.author | Castillo, G. A. Rodríguez | en_US |
dc.contributor.author | Esposito, P. | en_US |
dc.contributor.author | Belfiore, A. | en_US |
dc.contributor.author | Luca, A. De | en_US |
dc.contributor.author | WOLTER, Anna Luisa Maria | en_US |
dc.contributor.author | MEREGHETTI, Sandro | en_US |
dc.contributor.author | STELLA, Luigi | en_US |
dc.contributor.author | Rigoselli, M. | en_US |
dc.contributor.author | Earnshaw, H. P. | en_US |
dc.contributor.author | Pinto, C. | en_US |
dc.contributor.author | Roberts, T. P. | en_US |
dc.contributor.author | Walton, D. J. | en_US |
dc.contributor.author | BERNARDINI, Federico | en_US |
dc.contributor.author | Haberl, F. | en_US |
dc.contributor.author | Salvaggio, C. | en_US |
dc.contributor.author | Tiengo, A. | en_US |
dc.contributor.author | ZAMPIERI, Luca | en_US |
dc.contributor.author | BACHETTI, Matteo | en_US |
dc.contributor.author | Brightman, M. | en_US |
dc.contributor.author | CASELLA, Piergiorgio | en_US |
dc.contributor.author | D’Agostino, D. | en_US |
dc.contributor.author | Dall’Osso, S. | en_US |
dc.contributor.author | Fürst, F. | en_US |
dc.contributor.author | Harrison, F. A. | en_US |
dc.contributor.author | Mapelli, M. | en_US |
dc.contributor.author | PAPITTO, ALESSANDRO | en_US |
dc.contributor.author | Middleton, M. | en_US |
dc.date.accessioned | 2021-01-22T16:34:53Z | - |
dc.date.available | 2021-01-22T16:34:53Z | - |
dc.date.issued | 2020 | en_US |
dc.identifier.issn | 0004-637X | - |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/29951 | - |
dc.description.abstract | Ultraluminous X-ray sources (ULXs) are a class of accreting compact objects with X-ray luminosities above 1039 erg s-1. The ULX population counts several hundred objects but only a fraction are well studied. Here we present a detailed analysis of all ULXs hosted in the galaxy NGC 7456. It was observed in X-rays only once in the past (in 2005) by XMM-Newton. but the observation was short and strongly affected by high background. In 2018, we obtained a new, deeper (∼90 ks) XMM-Newton observation that allowed us to perform a detailed characterization of the ULXs hosted in the galaxy. ULX-1 and ULX-2, the two brightest objects (LX ∼ 6-10 × 1039 erg s-1), have spectra that can be described by a model with two thermal components, as often found in ULXs. ULX-1 also shows one order of magnitude in flux variability on short-term timescales (hundreds to thousands of kiloseconds). The other sources (ULX-3 and ULX-4) show flux changes of at least an order of magnitude, and these objects may be candidate transient ULXs, although longer X-ray monitoring or further studies are required to ascribe them to the ULX population. In addition, we found a previously undetected source that might be a new candidate ULX (labeled as ULX-5), with a luminosity of ∼1039 erg s-1 and hard power-law spectral shape, whose nature is still unclear and for which a background active galactic nucleus cannot be excluded. We discuss the properties of all the ULXs in NGC 7456 within the framework of super-Eddington accretion onto stellar-mass compact objects. Although no pulsations were detected, we cannot exclude that the sources host neutron stars. | - |
dc.language.iso | eng | - |
dc.title | The Ultraluminous X-Ray Sources Population of the Galaxy NGC 7456 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/1538-4357/ab6ffd | - |
dc.identifier.scopus | 2-s2.0-85081245756 | - |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/1538-4357/ab6ffd | - |
dc.relation.medium | STAMPA | - |
dc.relation.volume | 890 | - |
dc.relation.issue | 2 | - |
dc.relation.firstpage | 166 | - |
dc.type.referee | REF_1 | - |
dc.description.numberofauthors | 31 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | - |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL | - |
dc.type.miur | 262 Articolo in rivista | en_US |
dc.identifier.adsbibcode | 2020ApJ...890..166P | - |
dc.description.apc | no | - |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
item.cerifentitytype | Publications | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
crisitem.author.dept | IASF Palermo | - |
crisitem.author.dept | IASF Milano | - |
crisitem.author.dept | IASF Milano | - |
crisitem.author.dept | O.A. Roma | - |
crisitem.author.dept | O.A. Brera | - |
crisitem.author.dept | IASF Milano | - |
crisitem.author.dept | O.A. Roma | - |
crisitem.author.dept | O.A. Padova | - |
crisitem.author.dept | O.A. Cagliari | - |
crisitem.author.dept | O.A. Roma | - |
crisitem.author.dept | O.A. Roma | - |
crisitem.author.orcid | 0000-0002-3869-2925 | - |
crisitem.author.orcid | 0000-0002-8017-0338 | - |
crisitem.author.orcid | 0000-0002-9393-8078 | - |
crisitem.author.orcid | 0000-0001-5480-6438 | - |
crisitem.author.orcid | 0000-0001-5840-9835 | - |
crisitem.author.orcid | 0000-0003-3259-7801 | - |
crisitem.author.orcid | 0000-0002-0018-1687 | - |
crisitem.author.orcid | 0000-0001-5326-2010 | - |
crisitem.author.orcid | 0000-0002-6516-1329 | - |
crisitem.author.orcid | 0000-0002-4576-9337 | - |
crisitem.author.orcid | 0000-0002-0752-3301 | - |
crisitem.author.orcid | 0000-0001-6289-7413 | - |
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