Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/29765
DC Field | Value | Language |
---|---|---|
dc.contributor.author | BERNARDINI, Federico | en_US |
dc.contributor.author | Russell, D. M. | en_US |
dc.contributor.author | Kolojonen, K. I. I. | en_US |
dc.contributor.author | STELLA, Luigi | en_US |
dc.contributor.author | Hynes, R. I. | en_US |
dc.contributor.author | Corbel, S. | en_US |
dc.date.accessioned | 2021-01-14T10:40:26Z | - |
dc.date.available | 2021-01-14T10:40:26Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/29765 | - |
dc.description.abstract | Low-mass X-ray binaries (LMXBs) show evidence of a global correlation of debated origin between X-ray and optical luminosity. We study for the first time this correlation in two transient LMXBs, the black hole (BH) V404 Cyg and the neutron star Cen X-4, over six orders of magnitude in X-ray luminosity, from outburst to quiescence. After subtracting the contribution from the companion star, the Cen X-4 data can be described by a single power-law correlation of the form {L}{opt}\propto {L}{{X}}0.44, consistent with disk reprocessing. We find a similar correlation slope for V404 Cyg in quiescence (0.46) and a steeper one (0.56) in the outburst hard state of 1989. However, V404 Cyg is about 160-280 times optically brighter, at a given 3-9 keV X-ray luminosity, compared to Cen X-4. This ratio is a factor of 10 smaller in quiescence, where the normalization of the V404 Cyg correlation also changes. Once the bolometric X-ray emission is considered and the known main differences between V404 Cyg and Cen X-4 are taken into account (a larger compact object mass, accretion disk size, and the presence of a strong jet contribution in the hard state for the BH system), the two systems lie on the same correlation. In V404 Cyg, the jet dominates spectrally at optical-infrared frequencies during the hard state but makes a negligible contribution in quiescence, which may account for the change in its correlation slope and normalization. These results provide a benchmark to compare with data from the 2015 outburst of V404 Cyg and, potentially, other transient LMXBs as well. | en_US |
dc.language.iso | eng | en_US |
dc.title | ON THE OPTICAL–X-RAY CORRELATION FROM OUTBURST TO QUIESCENCE IN LOW-MASS X-RAY BINARIES: THE REPRESENTATIVE CASES OF V404 CYG AND CEN X-4 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/0004-637X/826/2/149 | en_US |
dc.identifier.scopus | 2-s2.0-84982272545 | en_US |
dc.identifier.isi | 000381977900049 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/0004-637X/826/2/149 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 826 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 149 | en_US |
dc.relation.lastpage | 160 | en_US |
dc.relation.numberofpages | 12 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | 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 | 2016ApJ...826..149B | 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.cerifentitytype | Publications | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
crisitem.author.dept | O.A. Roma | - |
crisitem.author.orcid | 0000-0001-5326-2010 | - |
crisitem.author.orcid | 0000-0002-0018-1687 | - |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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Bernardini_2016_ApJ_826_149.pdf | pdf editoriale | 969.23 kB | Adobe PDF | View/Open |
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