AustralieFrV1, Main, Exploration, bibRecord, 005B72

INVESTIGATING SLIM DISK SOLUTIONS FOR HLX-1 IN ESO 243-49

Identifieur interne : 005B72 ( Main/Exploration ); précédent : 005B71; suivant : 005B73

INVESTIGATING SLIM DISK SOLUTIONS FOR HLX-1 IN ESO 243-49

Auteurs : O. Godet [France] ; B. Plazolles [France] ; T. Kawaguchi [Japon] ; J.-P. Lasota [France, Pologne] ; D. Barret [France] ; S. A. Farrell [Royaume-Uni, Australie] ; V. Braito [Royaume-Uni] ; M. Servillat [États-Unis] ; N. Webb [France] ; N. Gehrels [États-Unis]

Source :

The Astrophysical journal [ 0004-637X ] ; 2012.

RBID : Pascal:12-0355540

Descripteurs français

Pascal (Inist)
- Galaxies, Trou noir, Luminosité, Modèle, Taux accrétion, Accrétion, Constante vitesse, Transfert masse, Disque accrétion, Analyse donnée, Cosmologie.
Wicri :
- topic : Cosmologie.

English descriptors

KwdEn :
- Accretion, Accretion disks, Accretion rate, Black holes, Cosmology, Data analysis, Galaxies, Luminosity, Mass transfer, Models, Rate constant.

Abstract

The hyperluminous X-ray source HLX-1 in the galaxy ESO 243-49, currently the best intermediate-mass black hole (BH) candidate, displays spectral transitions similar to those observed in Galactic BH binaries, but with a luminosity 100-1000 times higher. We investigated the X-ray properties of this unique source by fitting multi-epoch data collected by Swift, XMM-Newton, and Chandra with a disk model computing spectra for a wide range of sub- and super-Eddington accretion rates assuming a non-spinning BH and a face-on disk (i = 0°), Under these assumptions we find that the BH in HLX-1 is in the intermediate-mass range (∼2 x 10⁴ M_◦.) and the accretion flow is in the sub-Eddington regime. The disk radiation efficiency is η = 0.11 ± 0.03. We also show that the source does follow the L_X T⁴ relation for our mass estimate. At the outburst peaks, the source radiates near the Eddington limit. The accretion rate then stays constant around 4 x 10^-4 M_◦. yr^-1 for several days and then decreases exponentially. Such "plateaus" in the accretion rate could be evidence that enhanced mass-transfer rate is the driving outburst mechanism in HLX-1. We also report on the new outburst observed in 2011 August by the Swift X-Ray Telescope. The time of this new outburst further strengthens the ∼1 year recurrence timescale.

Affiliations:

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Le document en format XML

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<sZ>2 aut.</sZ>
<sZ>5 aut.</sZ>
<sZ>9 aut.</sZ>
</inist:fA14>
<country>France</country>
<wicri:noRegion>31028 Toulouse</wicri:noRegion>
<placeName><settlement type="city">Toulouse</settlement>
<region type="region" nuts="2">Occitanie (région administrative)</region>
<region type="old region" nuts="2">Midi-Pyrénées</region>
</placeName>
</affiliation>
</author>
<author><name sortKey="Gehrels, N" sort="Gehrels, N" uniqKey="Gehrels N" first="N." last="Gehrels">N. Gehrels</name>
<affiliation wicri:level="1"><inist:fA14 i1="09"><s1>NASA/Goddard Space Flight Center</s1>
<s2>Greenbelt, MD 20771</s2>
<s3>USA</s3>
<sZ>10 aut.</sZ>
</inist:fA14>
<country>États-Unis</country>
<wicri:noRegion>NASA/Goddard Space Flight Center</wicri:noRegion>
</affiliation>
</author>
</analytic>
<series><title level="j" type="main">The Astrophysical journal</title>
<title level="j" type="abbreviated">Astrophys. j.</title>
<idno type="ISSN">0004-637X</idno>
<imprint><date when="2012">2012</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
<seriesStmt><title level="j" type="main">The Astrophysical journal</title>
<title level="j" type="abbreviated">Astrophys. j.</title>
<idno type="ISSN">0004-637X</idno>
</seriesStmt>
</fileDesc>
<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Accretion</term>
<term>Accretion disks</term>
<term>Accretion rate</term>
<term>Black holes</term>
<term>Cosmology</term>
<term>Data analysis</term>
<term>Galaxies</term>
<term>Luminosity</term>
<term>Mass transfer</term>
<term>Models</term>
<term>Rate constant</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Galaxies</term>
<term>Trou noir</term>
<term>Luminosité</term>
<term>Modèle</term>
<term>Taux accrétion</term>
<term>Accrétion</term>
<term>Constante vitesse</term>
<term>Transfert masse</term>
<term>Disque accrétion</term>
<term>Analyse donnée</term>
<term>Cosmologie</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Cosmologie</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">The hyperluminous X-ray source HLX-1 in the galaxy ESO 243-49, currently the best intermediate-mass black hole (BH) candidate, displays spectral transitions similar to those observed in Galactic BH binaries, but with a luminosity 100-1000 times higher. We investigated the X-ray properties of this unique source by fitting multi-epoch data collected by Swift, XMM-Newton, and Chandra with a disk model computing spectra for a wide range of sub- and super-Eddington accretion rates assuming a non-spinning BH and a face-on disk (i = 0°), Under these assumptions we find that the BH in HLX-1 is in the intermediate-mass range (∼2 x 10<sup>4</sup>
 M<sub>◦.</sub>
) and the accretion flow is in the sub-Eddington regime. The disk radiation efficiency is η = 0.11 ± 0.03. We also show that the source does follow the L<sub>X</sub>
  T<sup>4</sup>
 relation for our mass estimate. At the outburst peaks, the source radiates near the Eddington limit. The accretion rate then stays constant around 4 x 10<sup>-4</sup>
 M<sub>◦.</sub>
 yr<sup>-1</sup>
 for several days and then decreases exponentially. Such "plateaus" in the accretion rate could be evidence that enhanced mass-transfer rate is the driving outburst mechanism in HLX-1. We also report on the new outburst observed in 2011 August by the Swift X-Ray Telescope. The time of this new outburst further strengthens the ∼1 year recurrence timescale.</div>
</front>
</TEI>
<affiliations><list><country><li>Australie</li>
<li>France</li>
<li>Japon</li>
<li>Pologne</li>
<li>Royaume-Uni</li>
<li>États-Unis</li>
</country>
<region><li>Midi-Pyrénées</li>
<li>Nouvelle-Galles du Sud</li>
<li>Occitanie (région administrative)</li>
<li>Île-de-France</li>
</region>
<settlement><li>Paris</li>
<li>Sydney</li>
<li>Toulouse</li>
</settlement>
<orgName><li>Université de Sydney</li>
</orgName>
</list>
<tree><country name="France"><region name="Occitanie (région administrative)"><name sortKey="Godet, O" sort="Godet, O" uniqKey="Godet O" first="O." last="Godet">O. Godet</name>
</region>
<name sortKey="Barret, D" sort="Barret, D" uniqKey="Barret D" first="D." last="Barret">D. Barret</name>
<name sortKey="Barret, D" sort="Barret, D" uniqKey="Barret D" first="D." last="Barret">D. Barret</name>
<name sortKey="Godet, O" sort="Godet, O" uniqKey="Godet O" first="O." last="Godet">O. Godet</name>
<name sortKey="Lasota, J P" sort="Lasota, J P" uniqKey="Lasota J" first="J.-P." last="Lasota">J.-P. Lasota</name>
<name sortKey="Plazolles, B" sort="Plazolles, B" uniqKey="Plazolles B" first="B." last="Plazolles">B. Plazolles</name>
<name sortKey="Plazolles, B" sort="Plazolles, B" uniqKey="Plazolles B" first="B." last="Plazolles">B. Plazolles</name>
<name sortKey="Webb, N" sort="Webb, N" uniqKey="Webb N" first="N." last="Webb">N. Webb</name>
<name sortKey="Webb, N" sort="Webb, N" uniqKey="Webb N" first="N." last="Webb">N. Webb</name>
</country>
<country name="Japon"><noRegion><name sortKey="Kawaguchi, T" sort="Kawaguchi, T" uniqKey="Kawaguchi T" first="T." last="Kawaguchi">T. Kawaguchi</name>
</noRegion>
</country>
<country name="Pologne"><noRegion><name sortKey="Lasota, J P" sort="Lasota, J P" uniqKey="Lasota J" first="J.-P." last="Lasota">J.-P. Lasota</name>
</noRegion>
</country>
<country name="Royaume-Uni"><noRegion><name sortKey="Farrell, S A" sort="Farrell, S A" uniqKey="Farrell S" first="S. A." last="Farrell">S. A. Farrell</name>
</noRegion>
<name sortKey="Braito, V" sort="Braito, V" uniqKey="Braito V" first="V." last="Braito">V. Braito</name>
</country>
<country name="Australie"><region name="Nouvelle-Galles du Sud"><name sortKey="Farrell, S A" sort="Farrell, S A" uniqKey="Farrell S" first="S. A." last="Farrell">S. A. Farrell</name>
</region>
</country>
<country name="États-Unis"><noRegion><name sortKey="Servillat, M" sort="Servillat, M" uniqKey="Servillat M" first="M." last="Servillat">M. Servillat</name>
</noRegion>
<name sortKey="Gehrels, N" sort="Gehrels, N" uniqKey="Gehrels N" first="N." last="Gehrels">N. Gehrels</name>
</country>
</tree>
</affiliations>
</record>

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INVESTIGATING SLIM DISK SOLUTIONS FOR HLX-1 IN ESO 243-49

INVESTIGATING SLIM DISK SOLUTIONS FOR HLX-1 IN ESO 243-49

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