60 research outputs found

    Chandra Observation of the Anomalous X-ray Pulsar 1E 1841-045

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    We present the results from the {\it Chandra} ACIS CC mode observation of an anomalous X-ray pulsar (AXP) 1E 1841-045. This is the first observation in which the pulsar spectrum in wide energy range is spatially discriminated from the surrounding SNR, Kes 73. Like other AXPs, the phase-integrated spectrum is fitted well with power-law plus blackbody model. The spectral parameters are Γ=2.0±0.3\Gamma = 2.0 \pm 0.3, kTBB=0.44±0.02kT_{\rm BB} = 0.44 \pm 0.02 keV, and NH=2.540.13+0.15×1022cm2N_H = 2.54^{+0.15}_{-0.13} \times 10^{22} {\rm cm}^{-2}. This photon index is significantly flatter than the other AXPs, and resemble to soft gamma-ray repeaters (SGRs) in the quiescent state. The pulse profile is double-peaked, and we found that the second peak has significantly hard spectrum. The spectra of all phases are consistent with power-law plus blackbody model with constant temperature and photon index. When fitted with two blackbody model, we obtained similarly good fit. These results can be interpreted that there are two emission regions with different energy spectra.Comment: 4 pages, 4 figures, accepted for publication in PASJ Letter

    Pulse Profile Change Possibly Associated with a Glitch in an Anomalous X-Ray Pulsar 4U 0142+61

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    We report a glitch-like pulse frequency deviation from the simple spin-down law in an anomalous X-ray pulsar (AXP) 4U 0142+61 detected by ASCA observations. We also found a significant pulse profile change after the putative glitch. The glitch parameters resemble those found in another AXP 1RXS J170849.0-400910, in the Vela pulsar, and in other radio pulsars. This suggests that the radio pulsars and AXPs have the same internal structure and glitch mechanism. It must be noted, however, that the pulse frequency anomaly can also be explained by a gradual change of the spin-down rate (P˙\dot{P}) without invoking a glitch.Comment: 14 pages, 4 figures, accepted by Ap

    機械学習の手法を用いた突発天体の選別

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    Open House, ISM in Tachikawa, 2015.6.19統計数理研究所オープンハウス(立川)、H27.6.19ポスター発

    全天X線監視装置MAXIを用いた突発天体の探索

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    Open House, ISM in Tachikawa, 2016.6.17統計数理研究所オープンハウス(立川)、H28.6.17ポスター発

    Hough変換を用いた移動天体の検出

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    Open House, ISM in National Center of Sciences Building, 2019.6.05統計数理研究所オープンハウス(学術総合センター)、R1.6.5ポスター発
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