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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Makishima, K.
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Topics
Publications (13/13 displayed)
- 2012Possible Detection of an Emission Cyclotron Resonance Scattering Feature from the Accretion-powered Pulsar 4U 1626-67citations
- 2012Spectral comparison of weak short bursts to the persistent X-rays from the magnetar 1E 1547.0-5408 in its 2009 outburstcitations
- 2010Wide-band Suzaku Analysis of the Persistent Emission from SGR 0501+4516 During the 2008 Outburstcitations
- 2009Suzaku Observation of the New Soft Gamma Repeater SGR 0501+4516 in Outburstcitations
- 2008Possible Suzaku detection of non-thermal X-ray signals from a rotating magnetized white dwarfcitations
- 2008Suzaku Broad-band Results On Cygnus X-1 In The Low/hard State
- 2007The Suzaku Observation of the Nucleus of the Radio-loud Active Galaxy Centaurus A: Constraints on Abundances of the Accreting Materialcitations
- 2007Suzaku observations of cyclotron resonances in binary X-ray pulsarscitations
- 2006Possible Suzaku detection of non-thermal X-ray signals from a rotating magnetized white dwarf
- 2006Possible Suzaku detection of non-thermal X-ray signals from a rotating magnetized white dwarf
- 2006Possible Suzaku detection of non-thermal X-ray signals from a rotating magnetized white dwarf
- 2006When Do Internal Shocks End and External Shocks Begin? Early-Time Broadband Modeling of GRB 051111citations
- 2002Performance of the ASTRO-E hard X-ray detectorcitations
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article
Possible Detection of an Emission Cyclotron Resonance Scattering Feature from the Accretion-powered Pulsar 4U 1626-67
Abstract
We present analysis of 4U 1626-67, a 7.7 s pulsar in a low-mass X-ray binary system, observed with the hard X-ray detector of the Japanese X-ray satellite Suzaku in 2006 March for a net exposure of ~88 ks. The source was detected at an average 10-60 keV flux of ~4 × 10<SUP>-10</SUP> erg cm<SUP>-2</SUP> s<SUP>-1</SUP>. The phase-averaged spectrum is reproduced well by combining a negative and positive power-law times exponential cutoff (NPEX) model modified at ~37 keV by a cyclotron resonance scattering feature (CRSF). The phase-resolved analysis shows that the spectra at the bright phases are well fit by the NPEX with CRSF model. On the other hand, the spectrum in the dim phase lacks the NPEX high-energy cutoff component, and the CRSF can be reproduced by either an emission or an absorption profile. When fitting the dim phase spectrum with the NPEX plus Gaussian model, we find that the feature is better described in terms of an emission rather than an absorption profile. The statistical significance of this result, evaluated by means of an F test, is between 2.91 × 10<SUP>-3</SUP> and 1.53 × 10<SUP>-5</SUP>, taking into account the systematic errors in the background evaluation of HXD-PIN. We find that the emission profile is more feasible than the absorption one for comparing the physical parameters in other phases. Therefore, we have possibly detected an emission line at the cyclotron resonance energy in the dim phase.