INTEGRAL and RXTE observations of accreting millisecond pulsar IGR J00291+5934 in outburst

Autor: P. Goldoni, E. W. Bonning, L. Kuiper, S. E. Shaw, Juri Poutanen, Luigi Stella, Maurizio Falanga, W. Hermsen, T. Di Salvo, Andrea Goldwurm
Přispěvatelé: FALANGA, M, KUIPER, L, POUTANEN, J, BONNING, EW, HERMSEN, W, DI SALVO, T, GOLDONI, P, GOLDWURM, P, SE SHAW, STELLA, L, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), INTEGRAL, High Energy Astrophys. & Astropart. Phys (API, FNWI), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2005
Předmět:
Spectral shape analysis
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
Hot spot (veterinary medicine)
Astrophysics
accretion
accretion discs
binaries: close
stars: individual: IGR J00291+5934
stars: neutron
X-rays: binaries
01 natural sciences
7. Clean energy
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]
symbols.namesake
stars: neutron
Pulsar
accretion
Millisecond pulsar
0103 physical sciences
Optical depth (astrophysics)
010306 general physics
010303 astronomy & astrophysics
Physics
Millisecond
binaries: close
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
Astrophysics (astro-ph)
Astronomy and Astrophysics
accretion discs
pulsars: individual (IGR J00291+5934)
13. Climate action
Space and Planetary Science
symbols
Electron temperature
Doppler effect
X-ray: binaries
Zdroj: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2005, 444, pp.15-24. ⟨10.1051/0004-6361:20053472⟩
Astronomy & Astrophysics, 444(1), 15-24. EDP Sciences
Astronomy and Astrophysics-A&A, 2005, 444, pp.15-24. ⟨10.1051/0004-6361:20053472⟩
ISSN: 0004-6361
DOI: 10.1051/0004-6361:20053472⟩
Popis: Simultaneous observations of the accretion-powered millisecond pulsar IGR J00291+5934 by International Gamma-Ray Astrophysics Laboratory and Rossi X-ray Timing Explorer during the 2004 December outburst are analysed. The average spectrum is well described by thermal Comptonization with an electron temperature of 50 keV and Thomson optical depth tau_T ~ 1 in a slab geometry. The spectral shape is almost constant during the outburst. We detect a spin-up of the pulsar with nudot=8.4x10E-13 Hz/s. The ISGRI data reveal the pulsation of X-rays at a period of 1.67 milliseconds up to ~150 keV. The pulsed fraction is shown to increase from 6 per cent at 6 keV to 12--20 per cent at 100 keV. This is naturally explained by the action of the Doppler effect the exponentially cutoff Comptonization spectrum from the hot spot. The nearly sinusoidal pulses show soft lags with complex energy dependence, increasing up to 7 keV, then decreasing to 15 keV, and seemingly saturating at higher energies.
11 pages, 8 figures, 3 tables, accepted for publication on A&A
Databáze: OpenAIRE
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