60 research outputs found
Chandra Observation of the Anomalous X-ray Pulsar 1E 1841-045
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
, keV, and . 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
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
J170849.0400910, 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 ()
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
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
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
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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