MAXI 15 Year Workshop for the Time Domain Astronomy

Session

11-1

Pulsar

11 Dec 2024, 09:00

CST Hall (in Bld. A in the map) (Nihon university)

Description

Chair: M. Sugizaki (Kanazawa U.)

67. INTEGRAL contributions to time domain astronomy

Erik Kuulkers (ESA)

11/12/2024, 09:00

30m

This presentation will review the main, unique, contributions of the INTErnational Gamma-Ray Astrophysics Laboratory, INTEGRAL, to time domain astronomy.

68. Orbital phase resolved and Intensity resolved spectroscopy of HMXBs with MAXI

Biswajit Paul (Raman Research Institute)

11/12/2024, 09:30

20m

Orbital phase-resolved spectroscopy of High Mass X-ray Binaries (HMXBs) allow detailed probe of the X-ray reprocessing environment and line of sight absorption of the X-rays by the stellar wind through different lines of sights in the binary. Same study, when carried out at different intensity levels of a given binary system allows probes of the changes in the reprocessing/absorption agents...

81. A new mechanism for state transition in Be X-ray binaries

Atsuo Okazaki (Hokkai-Gakuen University)

11/12/2024, 09:50

15m

Be X-ray binaries (BeXRBs) consist of a Be star (a massive star with a circumstellar disk) and a neutron star. They constitute a prominent subclass within the category of high-mass X-ray binaries, characterized by their transient nature. These binaries intermittently exhibit X-ray outbursts, whereas the rest of the time they remain quiescent. On the transition between these two X-ray activity...

82. Novel Paradigms of Magnetars Opened by Advanced Timing Studies

Kazuo Makishima (The University of Tokyo and RIKEN)

11/12/2024, 10:05

15m

Advanced timing studies of archival data from ASCA, Suzaku, NuSTAR, and XMM-Newton are opening several novel aspects of magnetars. (1a) Representative 7 magnetars were found to be axially deformed to 10^{-4}, and performs free precession. (1b) The deformation is due to internal magnetic pressure, with the internal (toroidal) magnetic fields reaching 10^{16} G (Makishima+24a, 24b). (2a) The...

177. Possible anti-correlations between pulsations and the disk growth of giant-outbursting Be X-ray binaries

Masafumi Niwano (Tokyo Tech)

poster

The mechanism of X-ray outbursts in Be X-ray binaries remains a mystery, and understanding their circumstellar disks is crucial for a solution of the mass-transfer problem. In particular, it is important to identify the Be star activities (e.g., pulsations) that cause mass ejection and, hence, disk formation. Therefore, we investigated the relationship between optical flux oscillations and the...

166. Supergiant Fast X-ray Transient from the Slowest X-ray Pulsar AX J1910.7+0917 with XRISM/Xtend

Marina Yoshimoto (Osaka University)

poster

XRISM/Xtend has a large Field of View (FOV; 38′×38′) and can detect serendipitous transient X-ray phenomena in the FOV. XRISM/Xtend detected a supergiant fast X-ray transient from AX J1910.7+0917 during observation of PV target W49B. The AX J1910.7+0917 is the slowest X-ray pulsar with a rotation period of ~ 10 hours. In the spectral analysis, the time average spectrum is reproduced with an...