AustralieFrV1, Main, Exploration, bibRecord, 00A727

Characterizing a new class of variability in GRS 1915+105 with simultaneous INTEGRAL/RXTE observations

Identifieur interne : 00A727 ( Main/Exploration ); précédent : 00A726; suivant : 00A728

Characterizing a new class of variability in GRS 1915+105 with simultaneous INTEGRAL/RXTE observations

Auteurs : D. C. Hannikainen [Finlande] ; J. Rodriguez [France, Suisse] ; O. Vilhu [Finlande] ; L. Hjalmarsdotter [Finlande] ; A. A. Zdziarski [Pologne] ; T. Belloni [Italie] ; J. Poutanen [Finlande] ; K. Wu [Royaume-Uni] ; S. E. Shaw [Suisse, Royaume-Uni] ; V. Beckmann [États-Unis] ; R. W. Hunstead [Australie] ; G. G. Pooley [Royaume-Uni] ; N. J. Westergaard [Danemark] ; I. F. Mirabel [Chili] ; P. Hakala [Finlande] ; A. Castro-Tirado [Espagne] ; Ph. Durouchoux [France]

Source :

Astronomy and astrophysics : (Berlin. Print) [ 0004-6361 ] ; 2005.

RBID : Pascal:05-0272474

Descripteurs français

Pascal (Inist)
- Variabilité, Observation simultanée, Précurseur, Courbe lumière, Forme impulsion, Position, Diagramme 2 couleurs, Modèle, Electron thermique, Binaire RX, Source RX binaire, Rayonnement gamma, Trou noir, Source RX cosmique, Cosmologie.
Wicri :
- topic : Cosmologie.

English descriptors

KwdEn :
- Binary X ray source, Black holes, Cosmic x-ray sources, Cosmology, Gamma radiation, Light curves, Models, Positions, Precursor, Pulse shape, Simultaneous observation, Thermal electron, Two color diagram, Variability, X-ray binary stars.

Abstract

We report on the analysis of 100 ks INTEGRAL observations of the Galactic microquasar GRS 1915+105. We focus on INTEGRAL Revolution number 48 when the source was found to exhibit a new type of variability as preliminarily reported in Hannikainen (2003, A&A, 411, L415). The variability pattern, which we name ξ, is characterized by a pulsing behaviour, consisting of a main pulse and a shorter, softer, and smaller amplitude precursor pulse, on a timescale of 5 min in the JEM-X 3-35 keV lightcurve. We also present simultaneous RXTE data. From a study of the individual RXTE/PCA pulse profiles we find that the rising phase is shorter and harder than the declining phase, which is opposite to what has been observed in other otherwise similar variability classes in this source. The position in the colour-colour diagram throughout the revolution corresponds to Stale A (Belloni et al. 2000, A&A, 355, 271) but not to any previously known variability class. We separated the INTEGRAL data into two subsets covering the maxima and minima of the pulses and fitted the resulting two broadband spectra with a hybrid thermal-non-thermal Comptonization model. The fits show the source to be in a soft state characterized by a strong disc component below ∼6 keV and Comptonization by both thermal and non-thermal electrons at higher energies.

Affiliations:

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Le document en format XML

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<author><name sortKey="Beckmann, V" sort="Beckmann, V" uniqKey="Beckmann V" first="V." last="Beckmann">V. Beckmann</name>
<affiliation wicri:level="1"><inist:fA14 i1="09"><s1>NASA Goddard Space Flight Center, Code 661</s1>
<s2>Greenhelt, MD 20771</s2>
<s3>USA</s3>
<sZ>10 aut.</sZ>
</inist:fA14>
<country>États-Unis</country>
<wicri:noRegion>Greenhelt, MD 20771</wicri:noRegion>
</affiliation>
<affiliation wicri:level="4"><inist:fA14 i1="10"><s1>Joint Center for Astrophysics, Department of Physics, University of Maryland, Baltimore County</s1>
<s2>Baltimore, MD 21250</s2>
<s3>USA</s3>
<sZ>10 aut.</sZ>
</inist:fA14>
<country>États-Unis</country>
<wicri:noRegion>Baltimore, MD 21250</wicri:noRegion>
<orgName type="university">Université du Maryland</orgName>
<placeName><settlement type="city">College Park (Maryland)</settlement>
<region type="state">Maryland</region>
</placeName>
</affiliation>
</author>
<author><name sortKey="Hunstead, R W" sort="Hunstead, R W" uniqKey="Hunstead R" first="R. W." last="Hunstead">R. W. Hunstead</name>
<affiliation wicri:level="4"><inist:fA14 i1="11"><s1>School of Physics, University of Sydney</s1>
<s2>Sydney NSW 2006</s2>
<s3>AUS</s3>
<sZ>11 aut.</sZ>
</inist:fA14>
<country>Australie</country>
<placeName><settlement type="city">Sydney</settlement>
<region type="état">Nouvelle-Galles du Sud</region>
</placeName>
<orgName type="university">Université de Sydney</orgName>
</affiliation>
</author>
<author><name sortKey="Pooley, G G" sort="Pooley, G G" uniqKey="Pooley G" first="G. G." last="Pooley">G. G. Pooley</name>
<affiliation wicri:level="4"><inist:fA14 i1="12"><s1>Astrophysics Group, Cavendish Laboratory, University of Cambridge, Madingley Road</s1>
<s2>Cambridge CB3 0HE</s2>
<s3>GBR</s3>
<sZ>12 aut.</sZ>
</inist:fA14>
<country>Royaume-Uni</country>
<wicri:noRegion>Cambridge CB3 0HE</wicri:noRegion>
<orgName type="university">Université de Cambridge</orgName>
<placeName><settlement type="city">Cambridge</settlement>
<region type="country">Angleterre</region>
<region type="région" nuts="1">Angleterre de l'Est</region>
</placeName>
</affiliation>
</author>
<author><name sortKey="Westergaard, N J" sort="Westergaard, N J" uniqKey="Westergaard N" first="N. J." last="Westergaard">N. J. Westergaard</name>
<affiliation wicri:level="1"><inist:fA14 i1="13"><s1>Danish Space Research Institute, Juliane Maries Vej 30</s1>
<s2>2100 Copenhagen</s2>
<s3>DNK</s3>
<sZ>13 aut.</sZ>
</inist:fA14>
<country>Danemark</country>
<placeName><settlement type="city">Copenhague</settlement>
<region type="région" nuts="2">Hovedstaden</region>
</placeName>
</affiliation>
</author>
<author><name sortKey="Mirabel, I F" sort="Mirabel, I F" uniqKey="Mirabel I" first="I. F." last="Mirabel">I. F. Mirabel</name>
<affiliation wicri:level="1"><inist:fA14 i1="14"><s1>European Southern Observatory</s1>
<s2>Santiago</s2>
<s3>CHL</s3>
<sZ>14 aut.</sZ>
</inist:fA14>
<country>Chili</country>
<wicri:noRegion>European Southern Observatory</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Hakala, P" sort="Hakala, P" uniqKey="Hakala P" first="P." last="Hakala">P. Hakala</name>
<affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Observatory, PO Box 14, 00014 University of Helsinki</s1>
<s3>FIN</s3>
<sZ>1 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>15 aut.</sZ>
</inist:fA14>
<country>Finlande</country>
<placeName><settlement type="city">Helsinki</settlement>
<region type="région" nuts="2">Uusimaa</region>
</placeName>
<orgName type="university">Université d'Helsinki</orgName>
</affiliation>
</author>
<author><name sortKey="Castro Tirado, A" sort="Castro Tirado, A" uniqKey="Castro Tirado A" first="A." last="Castro-Tirado">A. Castro-Tirado</name>
<affiliation wicri:level="2"><inist:fA14 i1="15"><s1>Instituto de Astrofisica de Andalucía (IAA-CSIC), PO Box 03004</s1>
<s2>18080 Granada</s2>
<s3>ESP</s3>
<sZ>16 aut.</sZ>
</inist:fA14>
<country>Espagne</country>
<placeName><region nuts="2" type="communauté">Andalousie</region>
</placeName>
</affiliation>
</author>
<author><name sortKey="Durouchoux, Ph" sort="Durouchoux, Ph" uniqKey="Durouchoux P" first="Ph." last="Durouchoux">Ph. Durouchoux</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Centre d'Études de Saclay. DAPNIA/Service d'Astrophysique (CNRS FRE 2591), Bât. 709, Orme des Merisiers</s1>
<s2>91191 Gif-sur-Yvette</s2>
<s3>FRA</s3>
<sZ>2 aut.</sZ>
<sZ>17 aut.</sZ>
</inist:fA14>
<country>France</country>
<wicri:noRegion>91191 Gif-sur-Yvette</wicri:noRegion>
<wicri:noRegion>Orme des Merisiers</wicri:noRegion>
<wicri:noRegion>91191 Gif-sur-Yvette</wicri:noRegion>
</affiliation>
</author>
</analytic>
<series><title level="j" type="main">Astronomy and astrophysics : (Berlin. Print)</title>
<title level="j" type="abbreviated">Astron. astrophys. : (Berl., Print)</title>
<idno type="ISSN">0004-6361</idno>
<imprint><date when="2005">2005</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
<seriesStmt><title level="j" type="main">Astronomy and astrophysics : (Berlin. Print)</title>
<title level="j" type="abbreviated">Astron. astrophys. : (Berl., Print)</title>
<idno type="ISSN">0004-6361</idno>
</seriesStmt>
</fileDesc>
<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Binary X ray source</term>
<term>Black holes</term>
<term>Cosmic x-ray sources</term>
<term>Cosmology</term>
<term>Gamma radiation</term>
<term>Light curves</term>
<term>Models</term>
<term>Positions</term>
<term>Precursor</term>
<term>Pulse shape</term>
<term>Simultaneous observation</term>
<term>Thermal electron</term>
<term>Two color diagram</term>
<term>Variability</term>
<term>X-ray binary stars</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Variabilité</term>
<term>Observation simultanée</term>
<term>Précurseur</term>
<term>Courbe lumière</term>
<term>Forme impulsion</term>
<term>Position</term>
<term>Diagramme 2 couleurs</term>
<term>Modèle</term>
<term>Electron thermique</term>
<term>Binaire RX</term>
<term>Source RX binaire</term>
<term>Rayonnement gamma</term>
<term>Trou noir</term>
<term>Source RX cosmique</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">We report on the analysis of 100 ks INTEGRAL observations of the Galactic microquasar GRS 1915+105. We focus on INTEGRAL Revolution number 48 when the source was found to exhibit a new type of variability as preliminarily reported in Hannikainen (2003, A&A, 411, L415). The variability pattern, which we name ξ, is characterized by a pulsing behaviour, consisting of a main pulse and a shorter, softer, and smaller amplitude precursor pulse, on a timescale of 5 min in the JEM-X 3-35 keV lightcurve. We also present simultaneous RXTE data. From a study of the individual RXTE/PCA pulse profiles we find that the rising phase is shorter and harder than the declining phase, which is opposite to what has been observed in other otherwise similar variability classes in this source. The position in the colour-colour diagram throughout the revolution corresponds to Stale A (Belloni et al. 2000, A&A, 355, 271) but not to any previously known variability class. We separated the INTEGRAL data into two subsets covering the maxima and minima of the pulses and fitted the resulting two broadband spectra with a hybrid thermal-non-thermal Comptonization model. The fits show the source to be in a soft state characterized by a strong disc component below ∼6 keV and Comptonization by both thermal and non-thermal electrons at higher energies.</div>
</front>
</TEI>
<affiliations><list><country><li>Australie</li>
<li>Chili</li>
<li>Danemark</li>
<li>Espagne</li>
<li>Finlande</li>
<li>France</li>
<li>Italie</li>
<li>Pologne</li>
<li>Royaume-Uni</li>
<li>Suisse</li>
<li>États-Unis</li>
</country>
<region><li>Andalousie</li>
<li>Angleterre</li>
<li>Angleterre de l'Est</li>
<li>Grand Londres</li>
<li>Hovedstaden</li>
<li>Maryland</li>
<li>Nouvelle-Galles du Sud</li>
<li>Uusimaa</li>
<li>Île-de-France</li>
</region>
<settlement><li>Cambridge</li>
<li>College Park (Maryland)</li>
<li>Copenhague</li>
<li>Gif-sur-Yvette</li>
<li>Helsinki</li>
<li>Londres</li>
<li>Sydney</li>
</settlement>
<orgName><li>University College de Londres</li>
<li>Université d'Helsinki</li>
<li>Université de Cambridge</li>
<li>Université de Sydney</li>
<li>Université du Maryland</li>
</orgName>
</list>
<tree><country name="Finlande"><region name="Uusimaa"><name sortKey="Hannikainen, D C" sort="Hannikainen, D C" uniqKey="Hannikainen D" first="D. C." last="Hannikainen">D. C. Hannikainen</name>
</region>
<name sortKey="Hakala, P" sort="Hakala, P" uniqKey="Hakala P" first="P." last="Hakala">P. Hakala</name>
<name sortKey="Hjalmarsdotter, L" sort="Hjalmarsdotter, L" uniqKey="Hjalmarsdotter L" first="L." last="Hjalmarsdotter">L. Hjalmarsdotter</name>
<name sortKey="Poutanen, J" sort="Poutanen, J" uniqKey="Poutanen J" first="J." last="Poutanen">J. Poutanen</name>
<name sortKey="Vilhu, O" sort="Vilhu, O" uniqKey="Vilhu O" first="O." last="Vilhu">O. Vilhu</name>
</country>
<country name="France"><region name="Île-de-France"><name sortKey="Rodriguez, J" sort="Rodriguez, J" uniqKey="Rodriguez J" first="J." last="Rodriguez">J. Rodriguez</name>
</region>
<name sortKey="Durouchoux, Ph" sort="Durouchoux, Ph" uniqKey="Durouchoux P" first="Ph." last="Durouchoux">Ph. Durouchoux</name>
</country>
<country name="Suisse"><noRegion><name sortKey="Rodriguez, J" sort="Rodriguez, J" uniqKey="Rodriguez J" first="J." last="Rodriguez">J. Rodriguez</name>
</noRegion>
<name sortKey="Shaw, S E" sort="Shaw, S E" uniqKey="Shaw S" first="S. E." last="Shaw">S. E. Shaw</name>
</country>
<country name="Pologne"><noRegion><name sortKey="Zdziarski, A A" sort="Zdziarski, A A" uniqKey="Zdziarski A" first="A. A." last="Zdziarski">A. A. Zdziarski</name>
</noRegion>
</country>
<country name="Italie"><noRegion><name sortKey="Belloni, T" sort="Belloni, T" uniqKey="Belloni T" first="T." last="Belloni">T. Belloni</name>
</noRegion>
</country>
<country name="Royaume-Uni"><region name="Angleterre"><name sortKey="Wu, K" sort="Wu, K" uniqKey="Wu K" first="K." last="Wu">K. Wu</name>
</region>
<name sortKey="Pooley, G G" sort="Pooley, G G" uniqKey="Pooley G" first="G. G." last="Pooley">G. G. Pooley</name>
<name sortKey="Shaw, S E" sort="Shaw, S E" uniqKey="Shaw S" first="S. E." last="Shaw">S. E. Shaw</name>
</country>
<country name="États-Unis"><noRegion><name sortKey="Beckmann, V" sort="Beckmann, V" uniqKey="Beckmann V" first="V." last="Beckmann">V. Beckmann</name>
</noRegion>
<name sortKey="Beckmann, V" sort="Beckmann, V" uniqKey="Beckmann V" first="V." last="Beckmann">V. Beckmann</name>
</country>
<country name="Australie"><region name="Nouvelle-Galles du Sud"><name sortKey="Hunstead, R W" sort="Hunstead, R W" uniqKey="Hunstead R" first="R. W." last="Hunstead">R. W. Hunstead</name>
</region>
</country>
<country name="Danemark"><region name="Hovedstaden"><name sortKey="Westergaard, N J" sort="Westergaard, N J" uniqKey="Westergaard N" first="N. J." last="Westergaard">N. J. Westergaard</name>
</region>
</country>
<country name="Chili"><noRegion><name sortKey="Mirabel, I F" sort="Mirabel, I F" uniqKey="Mirabel I" first="I. F." last="Mirabel">I. F. Mirabel</name>
</noRegion>
</country>
<country name="Espagne"><region name="Andalousie"><name sortKey="Castro Tirado, A" sort="Castro Tirado, A" uniqKey="Castro Tirado A" first="A." last="Castro-Tirado">A. Castro-Tirado</name>
</region>
</country>
</tree>
</affiliations>
</record>

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Characterizing a new class of variability in GRS 1915+105 with simultaneous INTEGRAL/RXTE observations

Characterizing a new class of variability in GRS 1915+105 with simultaneous INTEGRAL/RXTE observations

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