Spectral and timing properties of the accreting X-ray millisecond pulsar IGR J17511-3057
Identifieur interne : 004413 ( PascalFrancis/Curation ); précédent : 004412; suivant : 004414Spectral and timing properties of the accreting X-ray millisecond pulsar IGR J17511-3057
Auteurs : M. Falanga [Suisse] ; L. Kuiper [Pays-Bas] ; J. Poutanen [Finlande] ; D. K. Galloway [Australie] ; E. W. Bonning [États-Unis] ; E. Bozzo [Suisse] ; A. Goldwurm [France] ; W. Hermsen [Pays-Bas] ; L. Stella [Italie]Source :
- Astronomy and astrophysics : (Berlin. Print) [ 0004-6361 ] ; 2011.
Descripteurs français
- Pascal (Inist)
- Propriété spectrale, Timing, Pulsar RX, Source RX transitoire, Pulsar milliseconde, Sursaut RX, Domaine énergie keV, Courbe lumière, Forme impulsion, Température électron, Epaisseur optique, Plasma, Température photon, Diffusion optique, Modèle, Instabilité, Pulsation RX, Métallicité, Etoile neutron, Binaire RX, Source RX binaire, Source RX cosmique.
English descriptors
- KwdEn :
- Binary X ray source, Cosmic x-ray sources, Electron temperature, Instability, Light curves, Metallicity, Millisecond pulsar, Models, Neutron stars, Optical scattering, Optical thickness, Photon temperature, Plasma, Pulse shape, Spectral properties, Timing, Transient X ray source, X ray burst, X ray pulsar, X ray pulsation, X-ray binary stars, keV range.
Abstract
Context. IGR J17511-3057 is the second X-ray transient accreting millisecond pulsar discovered by INTEGRAL. It was in outburst for about a month beginning on September 13, 2009. Aims. We analyze the spectral and timing properties of the object and the characteristics of X-ray bursts with the aim to constrain the physical processes responsible for the X-ray production in this class of sources. Methods. We studied the broad-band spectrum of the persistent emission in the 0.8-300 keV energy band using simultaneous INTEGRAL, RXTE and Swift data obtained in September 2009. We also describe the timing properties in the 2-120 keV energy range such as the outburst light curve, pulse profile, pulsed fraction, pulsed emission, and time lags, and moreover study the properties of X-ray bursts discovered by RXTE and INTEGRAL and the recurrence time. Results. The broad-band average spectrum is well described by thermal Comptonization with an electron temperature of kTe ∼ 25 keV, soft seed photons of kTbb ∼ 0.6 keV, and Thomson optical depth τT ∼ 2 in a slab geometry. During the outburst the spectrum stays remarkably stable with plasma and soft seed photon temperatures and scattering optical depth being constant within errors. We fitted the outburst profile with the exponential model, and using the disk instability model we inferred the outer disk radius to be (4.8-5.4) x 1010 cm. The INTEGRAL and RXTE data reveal the X-ray pulsation at a period of 4.08 milliseconds up to ∼120 keV. The pulsed fraction is shown to decrease from ∼22% at 3 keV to a constant pulsed fraction of ∼17-18% between 7-30 keV, and then to decrease again to ∼13% at 60 keV. The nearly sinusoidal pulses show soft lags that monotonically increase with energy to about 0.2 ms at 10-20 keV similar to those observed in other accreting pulsars. The short burst profiles indicate hydrogen-poor material at ignition, which suggests either that the accreted material is hydrogen-deficient, or that the CNO metallicity is up to a factor of 2 times solar. However, the variation of the burst recurrence time as a function of m (inferred from the X-ray flux) is much smaller than predicted by helium-ignition models.
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<term>Light curves</term>
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<term>Millisecond pulsar</term>
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<term>Neutron stars</term>
<term>Optical scattering</term>
<term>Optical thickness</term>
<term>Photon temperature</term>
<term>Plasma</term>
<term>Pulse shape</term>
<term>Spectral properties</term>
<term>Timing</term>
<term>Transient X ray source</term>
<term>X ray burst</term>
<term>X ray pulsar</term>
<term>X ray pulsation</term>
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<term>keV range</term>
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<term>Timing</term>
<term>Pulsar RX</term>
<term>Source RX transitoire</term>
<term>Pulsar milliseconde</term>
<term>Sursaut RX</term>
<term>Domaine énergie keV</term>
<term>Courbe lumière</term>
<term>Forme impulsion</term>
<term>Température électron</term>
<term>Epaisseur optique</term>
<term>Plasma</term>
<term>Température photon</term>
<term>Diffusion optique</term>
<term>Modèle</term>
<term>Instabilité</term>
<term>Pulsation RX</term>
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<front><div type="abstract" xml:lang="en">Context. IGR J17511-3057 is the second X-ray transient accreting millisecond pulsar discovered by INTEGRAL. It was in outburst for about a month beginning on September 13, 2009. Aims. We analyze the spectral and timing properties of the object and the characteristics of X-ray bursts with the aim to constrain the physical processes responsible for the X-ray production in this class of sources. Methods. We studied the broad-band spectrum of the persistent emission in the 0.8-300 keV energy band using simultaneous INTEGRAL, RXTE and Swift data obtained in September 2009. We also describe the timing properties in the 2-120 keV energy range such as the outburst light curve, pulse profile, pulsed fraction, pulsed emission, and time lags, and moreover study the properties of X-ray bursts discovered by RXTE and INTEGRAL and the recurrence time. Results. The broad-band average spectrum is well described by thermal Comptonization with an electron temperature of kT<sub>e</sub>
∼ 25 keV, soft seed photons of kT<sub>bb</sub>
∼ 0.6 keV, and Thomson optical depth τ<sub>T</sub>
∼ 2 in a slab geometry. During the outburst the spectrum stays remarkably stable with plasma and soft seed photon temperatures and scattering optical depth being constant within errors. We fitted the outburst profile with the exponential model, and using the disk instability model we inferred the outer disk radius to be (4.8-5.4) x 10<sup>10</sup>
cm. The INTEGRAL and RXTE data reveal the X-ray pulsation at a period of 4.08 milliseconds up to ∼120 keV. The pulsed fraction is shown to decrease from ∼22% at 3 keV to a constant pulsed fraction of ∼17-18% between 7-30 keV, and then to decrease again to ∼13% at 60 keV. The nearly sinusoidal pulses show soft lags that monotonically increase with energy to about 0.2 ms at 10-20 keV similar to those observed in other accreting pulsars. The short burst profiles indicate hydrogen-poor material at ignition, which suggests either that the accreted material is hydrogen-deficient, or that the CNO metallicity is up to a factor of 2 times solar. However, the variation of the burst recurrence time as a function of m (inferred from the X-ray flux) is much smaller than predicted by helium-ignition models.</div>
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<fA66 i1="01"><s0>FRA</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>Context. IGR J17511-3057 is the second X-ray transient accreting millisecond pulsar discovered by INTEGRAL. It was in outburst for about a month beginning on September 13, 2009. Aims. We analyze the spectral and timing properties of the object and the characteristics of X-ray bursts with the aim to constrain the physical processes responsible for the X-ray production in this class of sources. Methods. We studied the broad-band spectrum of the persistent emission in the 0.8-300 keV energy band using simultaneous INTEGRAL, RXTE and Swift data obtained in September 2009. We also describe the timing properties in the 2-120 keV energy range such as the outburst light curve, pulse profile, pulsed fraction, pulsed emission, and time lags, and moreover study the properties of X-ray bursts discovered by RXTE and INTEGRAL and the recurrence time. Results. The broad-band average spectrum is well described by thermal Comptonization with an electron temperature of kT<sub>e</sub>
∼ 25 keV, soft seed photons of kT<sub>bb</sub>
∼ 0.6 keV, and Thomson optical depth τ<sub>T</sub>
∼ 2 in a slab geometry. During the outburst the spectrum stays remarkably stable with plasma and soft seed photon temperatures and scattering optical depth being constant within errors. We fitted the outburst profile with the exponential model, and using the disk instability model we inferred the outer disk radius to be (4.8-5.4) x 10<sup>10</sup>
cm. The INTEGRAL and RXTE data reveal the X-ray pulsation at a period of 4.08 milliseconds up to ∼120 keV. The pulsed fraction is shown to decrease from ∼22% at 3 keV to a constant pulsed fraction of ∼17-18% between 7-30 keV, and then to decrease again to ∼13% at 60 keV. The nearly sinusoidal pulses show soft lags that monotonically increase with energy to about 0.2 ms at 10-20 keV similar to those observed in other accreting pulsars. The short burst profiles indicate hydrogen-poor material at ignition, which suggests either that the accreted material is hydrogen-deficient, or that the CNO metallicity is up to a factor of 2 times solar. However, the variation of the burst recurrence time as a function of m (inferred from the X-ray flux) is much smaller than predicted by helium-ignition models.</s0>
</fC01>
<fC02 i1="01" i2="3"><s0>001E03</s0>
</fC02>
<fC03 i1="01" i2="X" l="FRE"><s0>Propriété spectrale</s0>
<s5>26</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG"><s0>Spectral properties</s0>
<s5>26</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA"><s0>Propiedad espectral</s0>
<s5>26</s5>
</fC03>
<fC03 i1="02" i2="3" l="FRE"><s0>Timing</s0>
<s5>27</s5>
</fC03>
<fC03 i1="02" i2="3" l="ENG"><s0>Timing</s0>
<s5>27</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE"><s0>Pulsar RX</s0>
<s5>28</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG"><s0>X ray pulsar</s0>
<s5>28</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA"><s0>Pulsar RX</s0>
<s5>28</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE"><s0>Source RX transitoire</s0>
<s5>29</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG"><s0>Transient X ray source</s0>
<s5>29</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA"><s0>Fuente RX transitoria</s0>
<s5>29</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE"><s0>Pulsar milliseconde</s0>
<s5>30</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG"><s0>Millisecond pulsar</s0>
<s5>30</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA"><s0>Pulsar milisegundo</s0>
<s5>30</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE"><s0>Sursaut RX</s0>
<s5>31</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG"><s0>X ray burst</s0>
<s5>31</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA"><s0>Arrebato RX</s0>
<s5>31</s5>
</fC03>
<fC03 i1="07" i2="3" l="FRE"><s0>Domaine énergie keV</s0>
<s5>32</s5>
</fC03>
<fC03 i1="07" i2="3" l="ENG"><s0>keV range</s0>
<s5>32</s5>
</fC03>
<fC03 i1="08" i2="3" l="FRE"><s0>Courbe lumière</s0>
<s5>33</s5>
</fC03>
<fC03 i1="08" i2="3" l="ENG"><s0>Light curves</s0>
<s5>33</s5>
</fC03>
<fC03 i1="09" i2="X" l="FRE"><s0>Forme impulsion</s0>
<s5>34</s5>
</fC03>
<fC03 i1="09" i2="X" l="ENG"><s0>Pulse shape</s0>
<s5>34</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA"><s0>Forma impulsión</s0>
<s5>34</s5>
</fC03>
<fC03 i1="10" i2="3" l="FRE"><s0>Température électron</s0>
<s5>35</s5>
</fC03>
<fC03 i1="10" i2="3" l="ENG"><s0>Electron temperature</s0>
<s5>35</s5>
</fC03>
<fC03 i1="11" i2="X" l="FRE"><s0>Epaisseur optique</s0>
<s5>36</s5>
</fC03>
<fC03 i1="11" i2="X" l="ENG"><s0>Optical thickness</s0>
<s5>36</s5>
</fC03>
<fC03 i1="11" i2="X" l="SPA"><s0>Espesor óptico</s0>
<s5>36</s5>
</fC03>
<fC03 i1="12" i2="3" l="FRE"><s0>Plasma</s0>
<s5>37</s5>
</fC03>
<fC03 i1="12" i2="3" l="ENG"><s0>Plasma</s0>
<s5>37</s5>
</fC03>
<fC03 i1="13" i2="3" l="FRE"><s0>Température photon</s0>
<s5>38</s5>
</fC03>
<fC03 i1="13" i2="3" l="ENG"><s0>Photon temperature</s0>
<s5>38</s5>
</fC03>
<fC03 i1="14" i2="X" l="FRE"><s0>Diffusion optique</s0>
<s5>39</s5>
</fC03>
<fC03 i1="14" i2="X" l="ENG"><s0>Optical scattering</s0>
<s5>39</s5>
</fC03>
<fC03 i1="14" i2="X" l="SPA"><s0>Difusión óptica</s0>
<s5>39</s5>
</fC03>
<fC03 i1="15" i2="X" l="FRE"><s0>Modèle</s0>
<s5>40</s5>
</fC03>
<fC03 i1="15" i2="X" l="ENG"><s0>Models</s0>
<s5>40</s5>
</fC03>
<fC03 i1="15" i2="X" l="SPA"><s0>Modelo</s0>
<s5>40</s5>
</fC03>
<fC03 i1="16" i2="3" l="FRE"><s0>Instabilité</s0>
<s5>41</s5>
</fC03>
<fC03 i1="16" i2="3" l="ENG"><s0>Instability</s0>
<s5>41</s5>
</fC03>
<fC03 i1="17" i2="X" l="FRE"><s0>Pulsation RX</s0>
<s5>42</s5>
</fC03>
<fC03 i1="17" i2="X" l="ENG"><s0>X ray pulsation</s0>
<s5>42</s5>
</fC03>
<fC03 i1="17" i2="X" l="SPA"><s0>Pulsación rayos X</s0>
<s5>42</s5>
</fC03>
<fC03 i1="18" i2="X" l="FRE"><s0>Métallicité</s0>
<s5>43</s5>
</fC03>
<fC03 i1="18" i2="X" l="ENG"><s0>Metallicity</s0>
<s5>43</s5>
</fC03>
<fC03 i1="18" i2="X" l="SPA"><s0>Metalicidad</s0>
<s5>43</s5>
</fC03>
<fC03 i1="19" i2="3" l="FRE"><s0>Etoile neutron</s0>
<s5>44</s5>
</fC03>
<fC03 i1="19" i2="3" l="ENG"><s0>Neutron stars</s0>
<s5>44</s5>
</fC03>
<fC03 i1="20" i2="3" l="FRE"><s0>Binaire RX</s0>
<s5>45</s5>
</fC03>
<fC03 i1="20" i2="3" l="ENG"><s0>X-ray binary stars</s0>
<s5>45</s5>
</fC03>
<fC03 i1="21" i2="X" l="FRE"><s0>Source RX binaire</s0>
<s5>46</s5>
</fC03>
<fC03 i1="21" i2="X" l="ENG"><s0>Binary X ray source</s0>
<s5>46</s5>
</fC03>
<fC03 i1="21" i2="X" l="SPA"><s0>Fuente RX binaria</s0>
<s5>46</s5>
</fC03>
<fC03 i1="22" i2="3" l="FRE"><s0>Source RX cosmique</s0>
<s5>47</s5>
</fC03>
<fC03 i1="22" i2="3" l="ENG"><s0>Cosmic x-ray sources</s0>
<s5>47</s5>
</fC03>
<fN21><s1>213</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
</fN82>
</pA>
</standard>
</inist>
</record>
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