Discovery of absorption features of the accretion disc corona and systematic acceleration of the X-ray burst rate in XB 1323-619

2005
journal article
article
20
cris.lastimport.wos2024-04-10T00:47:18Z
dc.abstract.enWe present results from analysis of the observation of the dipping, quasi-periodic bursting low mass X-ray binary XB 1323-619 made with XMM—Newton in 2003 January. In spectral analysis of the non-dip, non-burst EPIC PN spectrum, a number of absorption lines were discovered, notably at 6.70 and 6.98 keV, which we identify with scattering by high ionization state ions Fe XXV and Fe XXVI. Such features have been seen in other dipping sources, but their origin was not understood. Curve of growth analysis provided a consistent solution in which the line ratio was reproduced assuming collisional ionization with kT = 31 keV, close to the electron temperature we previously determined for the accretion disc corona (ADC) in this source. We thus propose that the absorption lines in the dipping low mass X-ray binaries (LMXB) are produced in the ADC. Spectral evolution in dipping was well described by the progressive covering model, which we have previously shown to give very good explanations of many dipping sources. We discuss the proposal of Boirin et al. (2004b), based on analysis of the present observation, that spectral evolution in all of the dipping LMXB may be explained by subjecting the continuum to a highly ionized absorber. This would require a decrease in X-ray intensity by a factor of ∼3 in dipping at energies where photoelectric absorption is not effective (40–100 keV), which previous BeppoSAX analysis of several sources firmly rules out. In XB 1323-619, any decrease was less than 10 ± 10 per cent and so the ionized absorber proposal can be ruled out. We find a remarkable linear increase in the rate of X-ray bursts with time over the 14-yr period since 1989 and a systematic non-linear increase in source luminosity (L). The linear variation of burst rate with L shows that the burst rate is proportional to mass accretion rate and if continued implies that the gap between bursts will become zero on 2008 January 11. In reality, we expect the source to undergo a transition from X-ray bursting to X-ray flaring, which would confirm the suggestion we previously made that flaring is unstable nuclear burning effectively consisting of a superposition of X-ray bursts.pl
dc.affiliationWydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomicznepl
dc.contributor.authorChurch, Michael J.pl
dc.contributor.authorReed, D.pl
dc.contributor.authorDotani, T.pl
dc.contributor.authorBałucińska-Church, Monikapl
dc.contributor.authorSmale, A. P.pl
dc.date.accessioned2020-10-12T09:38:43Z
dc.date.available2020-10-12T09:38:43Z
dc.date.issued2005pl
dc.date.openaccess0
dc.description.accesstimepo opublikowaniu
dc.description.number4pl
dc.description.physical1336-1344pl
dc.description.versionostateczna wersja wydawcy
dc.description.volume359pl
dc.identifier.doi10.1111/j.1365-2966.2005.08728.xpl
dc.identifier.eissn1365-2966pl
dc.identifier.issn0035-8711pl
dc.identifier.projectROD UJ / Opl
dc.identifier.urihttps://ruj.uj.edu.pl/xmlui/handle/item/247711
dc.languageengpl
dc.language.containerengpl
dc.rightsDodaję tylko opis bibliograficzny*
dc.rights.licenceOTHER
dc.rights.uri*
dc.share.typeotwarte czasopismo
dc.subject.enaccretionpl
dc.subject.enaccretion discspl
dc.subject.enbinaries: closepl
dc.subject.enstars: neutronpl
dc.subject.enX-rays: binariespl
dc.subject.enX-rays: individual: XB 1323-619pl
dc.subtypeArticlepl
dc.titleDiscovery of absorption features of the accretion disc corona and systematic acceleration of the X-ray burst rate in XB 1323-619pl
dc.title.journalMonthly Notices of the Royal Astronomical Societypl
dc.typeJournalArticlepl
dspace.entity.typePublication
cris.lastimport.wos
2024-04-10T00:47:18Z
dc.abstract.enpl
We present results from analysis of the observation of the dipping, quasi-periodic bursting low mass X-ray binary XB 1323-619 made with XMM—Newton in 2003 January. In spectral analysis of the non-dip, non-burst EPIC PN spectrum, a number of absorption lines were discovered, notably at 6.70 and 6.98 keV, which we identify with scattering by high ionization state ions Fe XXV and Fe XXVI. Such features have been seen in other dipping sources, but their origin was not understood. Curve of growth analysis provided a consistent solution in which the line ratio was reproduced assuming collisional ionization with kT = 31 keV, close to the electron temperature we previously determined for the accretion disc corona (ADC) in this source. We thus propose that the absorption lines in the dipping low mass X-ray binaries (LMXB) are produced in the ADC. Spectral evolution in dipping was well described by the progressive covering model, which we have previously shown to give very good explanations of many dipping sources. We discuss the proposal of Boirin et al. (2004b), based on analysis of the present observation, that spectral evolution in all of the dipping LMXB may be explained by subjecting the continuum to a highly ionized absorber. This would require a decrease in X-ray intensity by a factor of ∼3 in dipping at energies where photoelectric absorption is not effective (40–100 keV), which previous BeppoSAX analysis of several sources firmly rules out. In XB 1323-619, any decrease was less than 10 ± 10 per cent and so the ionized absorber proposal can be ruled out. We find a remarkable linear increase in the rate of X-ray bursts with time over the 14-yr period since 1989 and a systematic non-linear increase in source luminosity (L). The linear variation of burst rate with L shows that the burst rate is proportional to mass accretion rate and if continued implies that the gap between bursts will become zero on 2008 January 11. In reality, we expect the source to undergo a transition from X-ray bursting to X-ray flaring, which would confirm the suggestion we previously made that flaring is unstable nuclear burning effectively consisting of a superposition of X-ray bursts.
dc.affiliationpl
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne
dc.contributor.authorpl
Church, Michael J.
dc.contributor.authorpl
Reed, D.
dc.contributor.authorpl
Dotani, T.
dc.contributor.authorpl
Bałucińska-Church, Monika
dc.contributor.authorpl
Smale, A. P.
dc.date.accessioned
2020-10-12T09:38:43Z
dc.date.available
2020-10-12T09:38:43Z
dc.date.issuedpl
2005
dc.date.openaccess
0
dc.description.accesstime
po opublikowaniu
dc.description.numberpl
4
dc.description.physicalpl
1336-1344
dc.description.version
ostateczna wersja wydawcy
dc.description.volumepl
359
dc.identifier.doipl
10.1111/j.1365-2966.2005.08728.x
dc.identifier.eissnpl
1365-2966
dc.identifier.issnpl
0035-8711
dc.identifier.projectpl
ROD UJ / O
dc.identifier.uri
https://ruj.uj.edu.pl/xmlui/handle/item/247711
dc.languagepl
eng
dc.language.containerpl
eng
dc.rights*
Dodaję tylko opis bibliograficzny
dc.rights.licence
OTHER
dc.rights.uri*
dc.share.type
otwarte czasopismo
dc.subject.enpl
accretion
dc.subject.enpl
accretion discs
dc.subject.enpl
binaries: close
dc.subject.enpl
stars: neutron
dc.subject.enpl
X-rays: binaries
dc.subject.enpl
X-rays: individual: XB 1323-619
dc.subtypepl
Article
dc.titlepl
Discovery of absorption features of the accretion disc corona and systematic acceleration of the X-ray burst rate in XB 1323-619
dc.title.journalpl
Monthly Notices of the Royal Astronomical Society
dc.typepl
JournalArticle
dspace.entity.type
Publication
Affiliations

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