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Mixed H/He bursts i...
Mixed H/He bursts in SAX J1748.9-2021 during the spectral change of its 2015 outburst
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- Li, Z. (författare)
- Xiangtan Univ, Dept Phys, Xiangtan 411105, Peoples R China.;ISSI, Hallerstr 6, CH-3012 Bern, Switzerland.;Univ Bern, Albert Einstein Ctr Fundamental Phys, Inst Theoret Phys, Lab High Energy Phys, Bern, Switzerland.
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- De Falco, V. (författare)
- ISSI, Hallerstr 6, CH-3012 Bern, Switzerland.;Univ Basel, Dept Phys, Klingelbergstr 82, CH-4056 Basel, Switzerland.
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- Falanga, M. (författare)
- ISSI, Hallerstr 6, CH-3012 Bern, Switzerland.;Int Space Sci Inst Beijing, 1 Nanertiao, Beijing 100190, Peoples R China.
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- Bozzo, E. (författare)
- Univ Geneva, Dept Astron, Chemin Ecogia 16, CH-1290 Versoix, Switzerland.
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- Kuiper, L. (författare)
- SRON, Netherlands Inst Space Res, Sorbonnelaan 2, NL-3584 CA Utrecht, Netherlands.
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- Poutanen, Juri (författare)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Univ Turku, Dept Phys & Astron, Tuorla Observ, Turku 20014, Finland.;Russian Acad Sci, Space Res Inst, Profsoyuznaya Str 84-32, Moscow 117997, Russia,Nordiska institutet för teoretisk fysik (Nordita),University of Turku, Finland; Space Research Institute of the Russian Academy of Sciences, Russia
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- Cumming, A. (författare)
- McGill Univ, Dept Phys, 3600 Rue Univ, Montreal, PQ H3A 2T8, Canada.;McGill Univ, McGill Space Inst, 3600 Rue Univ, Montreal, PQ H3A 2T8, Canada.
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- Galloway, D. K. (författare)
- Monash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia.;Monash Univ, Monash Ctr Astrophys, Clayton, Vic 3800, Australia.
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- Zhang, S. (författare)
- Inst High Energy Phys, Lab Particle Astrophys, Beijing 100049, Peoples R China.
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Xiangtan Univ, Dept Phys, Xiangtan 411105, Peoples R China;ISSI, Hallerstr 6, CH-3012 Bern, Switzerland.;Univ Bern, Albert Einstein Ctr Fundamental Phys, Inst Theoret Phys, Lab High Energy Phys, Bern, Switzerland. ISSI, Hallerstr 6, CH-3012 Bern, Switzerland.;Univ Basel, Dept Phys, Klingelbergstr 82, CH-4056 Basel, Switzerland. (creator_code:org_t)
- 2018-12-06
- 2018
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 620
- Relaterad länk:
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https://www.aanda.or...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- SAX J1748.9-2021 is a transiently accreting X-ray millisecond pulsar. It is also known as an X-ray burster source discovered by Beppo-SAX. We analyzed the persistent emission and type-I X-ray burst properties during its 2015 outburst. The source changed from hard to soft state within half day. We modeled the broadband spectra of the persistent emission in the (1-250) keV energy band for both spectral states using the quasi-simultaneous INTEGRAL and Swift data. The broadband spectra are well fitted by an absorbed thermal Componization model, COMPPS, in a slab geometry. The best-fits for the two states indicate significantly different plasma temperature of 18 and 5 keV and the Thomson optical depths of three and four, respectively. In total, 56 type-I X-ray bursts were observed during the 2015 outburst, of which 26 detected by INTEGRAL in the hard state, 25 by XMM-Newton in the soft state, and five by Swift in both states. As the object transited from the hard to the soft state, the recurrence time for X-ray bursts decreased from approximate to 2 to approximate to 1 h. The relation between the recurrence time, Delta t(rec )and the local mass accretion rate per unit area onto the compact object, in, is fitted by a power-law model, and yielded as best fit at Delta t(rec )similar to <(m) over dot >(-1)(.0)(2 +/-)(0.)(03) using all X-ray bursts. In both cases, the observed recurrence times are consistent with the mixed hydrogen and helium bursts. We also discuss the effects of type-I X-ray bursts prior to the hard to soft transition.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- X-rays: binaries
- X-rays: bursts
- stars: neutron
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