Takeshi Go Tsuru
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View article: XRISM Constraints on Unidentified X-Ray Emission Lines, Including the 3.5 keV Line, in the Stacked Spectrum of 10 Galaxy Clusters
XRISM Constraints on Unidentified X-Ray Emission Lines, Including the 3.5 keV Line, in the Stacked Spectrum of 10 Galaxy Clusters Open
We stack 3.75 Ms of early XRISM Resolve observations of 10 galaxy clusters to search for unidentified spectral lines in the E = 2.5–15 keV band (rest frame), including the E = 3.5 keV line reported in earlier low spectral resolution studie…
View article: The First Proper Motion Measurement of the Acceleration Regions in the Large-scale Jets of SS 433 Powering the W50 Nebula
The First Proper Motion Measurement of the Acceleration Regions in the Large-scale Jets of SS 433 Powering the W50 Nebula Open
We report on new Chandra ACIS-I observations of the X-ray knots located in the western and eastern lobes of W50 associated with the parsec-scale jets of the Galactic microquasar SS 433. These knots are likely counterparts of the recently d…
View article: The first proper motion measurement of the acceleration regions in the large-scale jets of SS 433 powering the W50 nebula
The first proper motion measurement of the acceleration regions in the large-scale jets of SS 433 powering the W50 nebula Open
We report on new Chandra ACIS-I observations of the X-ray knots located in the western and eastern lobes of W50 associated with the parsec-scale jets of the Galactic microquasar SS 433. These knots are likely counterparts of the recently d…
View article: CCD driving technique to suppress anomalous charge intrusion from outside the imaging area for soft X-ray imager of Xtend onboard XRISM
CCD driving technique to suppress anomalous charge intrusion from outside the imaging area for soft X-ray imager of Xtend onboard XRISM Open
View article: In-orbit Performance of the Soft X-ray Imaging Telescope Xtend aboard XRISM
In-orbit Performance of the Soft X-ray Imaging Telescope Xtend aboard XRISM Open
We present a summary of the in-orbit performance of the soft X-ray imaging telescope Xtend onboard the XRISM mission, based on in-flight observation data, including first-light celestial objects, calibration sources, and results from the c…
View article: Soft X-ray Imager of the Xtend system on board XRISM
Soft X-ray Imager of the Xtend system on board XRISM Open
The Soft X-ray Imager (SXI) is the X-ray charge-coupled device (CCD) camera for the soft X-ray imaging telescope Xtend installed on the X-ray Imaging and Spectroscopy Mission (XRISM), which was adopted as a recovery mission for the Hitomi …
View article: Initial operations of the Soft X-ray Imager onboard XRISM
Initial operations of the Soft X-ray Imager onboard XRISM Open
View article: Soft X-ray Imager of the Xtend system onboard XRISM
Soft X-ray Imager of the Xtend system onboard XRISM Open
The Soft X-ray Imager (SXI) is the X-ray charge-coupled device (CCD) camera for the soft X-ray imaging telescope Xtend installed on the X-ray Imaging and Spectroscopy Mission (XRISM), which was adopted as a recovery mission for the Hitomi …
View article: A detailed study on spectroscopic performance of SOI pixel detector with a pinned depleted diode structure for X-ray astronomy
A detailed study on spectroscopic performance of SOI pixel detector with a pinned depleted diode structure for X-ray astronomy Open
View article: Evidence for Type Ib/c Origin of the Supernova Remnant G292.0+1.8
Evidence for Type Ib/c Origin of the Supernova Remnant G292.0+1.8 Open
Circumstellar material (CSM) produced by mass loss from massive stars (≳10 M ⊙ ) through strong stellar winds or binary stripping provides rich information for understanding progenitors of core-collapse supernova remnants. In this paper we…
View article: Evidence for Type Ib/c origin of the supernova remnant G292.0+1.8
Evidence for Type Ib/c origin of the supernova remnant G292.0+1.8 Open
Circumstellar material (CSM) produced by mass loss from massive stars ($\gtrsim10 M_{\odot}$) through strong stellar winds or binary stripping provides rich information for understanding progenitors of core-collapse supernova remnants. In …
View article: Status of Xtend telescope onboard X-Ray Imaging and Spectroscopy Mission (XRISM)
Status of Xtend telescope onboard X-Ray Imaging and Spectroscopy Mission (XRISM) Open
Xtend is one of the two telescopes onboard the X-ray imaging and spectroscopy mission (XRISM), which was launched on September 7th, 2023. Xtend comprises the Soft X-ray Imager (SXI), an X-ray CCD camera, and the X-ray Mirror Assembly (XMA)…
View article: Feasibility study of upper atmosphere density measurement on the ISS by observations of the CXB transmitted through the Earth rim
Feasibility study of upper atmosphere density measurement on the ISS by observations of the CXB transmitted through the Earth rim Open
Measurements of the upper atmosphere at ~100 km are important to investigate climate change, space weather forecasting, and the interaction between the Sun and the Earth. Atmospheric occultations of cosmic X-ray sources are an effective te…
View article: Progenitor Constraint-incorporating Shell Merger: The Case of Supernova Remnant G359.0–0.9
Progenitor Constraint-incorporating Shell Merger: The Case of Supernova Remnant G359.0–0.9 Open
It is generally hard to put robust constraints on progenitor masses of supernovae and supernova remnants (SNRs) observationally, while they offer tantalizing clues to understanding explosion mechanisms and mass distribution. Our recent stu…
View article: Status of Xtend telescope onboard X-Ray Imaging and Spectroscopy Mission (XRISM)
Status of Xtend telescope onboard X-Ray Imaging and Spectroscopy Mission (XRISM) Open
Xtend is one of the two telescopes onboard the X-ray imaging and spectroscopy mission (XRISM), which was launched on September 7th, 2023. Xtend comprises the Soft X-ray Imager (SXI), an X-ray CCD camera, and the X-ray Mirror Assembly (XMA)…
View article: Initial operations of the Soft X-ray Imager onboard XRISM
Initial operations of the Soft X-ray Imager onboard XRISM Open
XRISM (X-Ray Imaging and Spectroscopy Mission) is an astronomical satellite with the capability of high-resolution spectroscopy with the X-ray microcalorimeter, Resolve, and wide field-of-view imaging with the CCD camera, Xtend. Xtend cons…
View article: High-velocity Blue-shifted Fe xxv Heα Line during a Superflare of the RS Canum Venaticorum–type Star IM Peg
High-velocity Blue-shifted Fe xxv Heα Line during a Superflare of the RS Canum Venaticorum–type Star IM Peg Open
The Monitor of All-sky X-ray Image (MAXI) detected a superflare, releasing 5 × 10 37 erg in 2−10 keV, of the RS CVn-type star IM Peg at 10:41 UT on 2023 July 23 with its Gas Slit Camera (2−30 keV). We conducted X-ray follow-up observations…
View article: Initial operations of the Soft X-ray Imager onboard XRISM
Initial operations of the Soft X-ray Imager onboard XRISM Open
XRISM (X-Ray Imaging and Spectroscopy Mission) is an astronomical satellite with the capability of high-resolution spectroscopy with the X-ray microcalorimeter, Resolve, and wide field-of-view imaging with the CCD camera, Xtend. The Xtend …
View article: High-velocity blue-shifted Fe XXV He$α$ line during a superflare of the RS CVn-type star IM Peg
High-velocity blue-shifted Fe XXV He$α$ line during a superflare of the RS CVn-type star IM Peg Open
Monitor of All-sky X-ray Image (MAXI) detected a superflare, releasing $5\times 10^{37}$ erg in 2$-$10 keV, of the RS CVn-type star IM Peg at 10:41 UT on 2023 July 23 with its Gas Slit Camera (GSC; 2$-$30 keV). We conducted X-ray follow-up…
View article: Progenitor Constraint Incorporating Shell Merger: The Case of Supernova Remnant G359.0-0.9
Progenitor Constraint Incorporating Shell Merger: The Case of Supernova Remnant G359.0-0.9 Open
It is generally hard to put robust constraints on progenitor masses of supernovae (SNe) and remnants (SNRs) observationally, while they offer tantalizing clues to understanding explosion mechanisms and mass distribution. Our recent study s…
View article: Evaluation of the X-ray SOI pixel detector with the on-chip ADC
Evaluation of the X-ray SOI pixel detector with the on-chip ADC Open
XRPIX is the monolithic X-ray SOI (silicon-on-insulator) pixel detector, which has a time resolution better than 10 μs as well as a high detection efficiency for X-rays above 10 keV. XRPIX is planned to be installed on future X-ray satelli…
View article: Evaluation of the X-ray SOI pixel detector with the on-chip ADC
Evaluation of the X-ray SOI pixel detector with the on-chip ADC Open
XRPIX is the monolithic X-ray SOI (silicon-on-insulator) pixel detector, which has a time resolution better than 10 $\rmμ$s as well as a high detection efficiency for X-rays above 10 keV. XRPIX is planned to be installed on future X-ray sa…
View article: Multiwavelength observation of an active M-dwarf star EV Lac and its stellar flare accompanied by a delayed prominence eruption
Multiwavelength observation of an active M-dwarf star EV Lac and its stellar flare accompanied by a delayed prominence eruption Open
We conducted 4-night multiwavelength observations of an active M-dwarf star EV Lac on 2022 October 24$-$27 with simultaneous coverage of soft X-rays (NICER; 0.2$-$12 $\mathrm{keV}$, Swift XRT; 0.2$-$10 $\mathrm{keV}$), near-ultraviolet (Sw…
View article: Design study and spectroscopic performance of SOI pixel detector with a pinned depleted diode structure for X-ray astronomy
Design study and spectroscopic performance of SOI pixel detector with a pinned depleted diode structure for X-ray astronomy Open
View article: Performance Evaluation of “XRPIX” Event-Driven SOI Pixel Detector for Cosmic MeV Gamma-ray Observation
Performance Evaluation of “XRPIX” Event-Driven SOI Pixel Detector for Cosmic MeV Gamma-ray Observation Open
Cosmic MeV gamma-ray observations are important for elucidating physics in high-energy objects such as gamma-ray bursts and active galactic nuclear jet blazars, for detecting nuclear gamma-rays in supernova explosions, and for advancing mu…
View article: Development of an electron-tracking Compton camera using SOI pixel sensor for sub-MeV gamma-ray observations
Development of an electron-tracking Compton camera using SOI pixel sensor for sub-MeV gamma-ray observations Open
We have been developed an electron tracking Compton camera (ETCC) using an SOI pixel semiconductor detector for observation sub MeV gamma rays. An electron tracking Compton camera can reconstruct arrival directions of gamma rays event by e…
View article: ISAI: Investigating Solar Axion by Iron-57
ISAI: Investigating Solar Axion by Iron-57 Open
The existence of the axion is a unique solution for the strong CP problem, and the axion is one of the most promising candidates of the dark matter. Investigating Solar Axion by Iron-57 (ISAI) is being prepared as a complemented table-top …
View article: Radiation-Induced Degradation Mechanism of X-Ray SOI Pixel Sensors With Pinned Depleted Diode Structure
Radiation-Induced Degradation Mechanism of X-Ray SOI Pixel Sensors With Pinned Depleted Diode Structure Open
The X-ray Silicon-On-Insulator (SOI) pixel sensor named XRPIX has been\ndeveloped for the future X-ray astronomical satellite FORCE. XRPIX is capable\nof a wide-band X-ray imaging spectroscopy from below 1 keV to a few tens of keV\nwith a …
View article: Radiation-Induced Degradation Mechanism of X-ray SOI Pixel Sensors with Pinned Depleted Diode Structure
Radiation-Induced Degradation Mechanism of X-ray SOI Pixel Sensors with Pinned Depleted Diode Structure Open
The X-ray Silicon-On-Insulator (SOI) pixel sensor named XRPIX has been developed for the future X-ray astronomical satellite FORCE. XRPIX is capable of a wide-band X-ray imaging spectroscopy from below 1 keV to a few tens of keV with a goo…
View article: Progenitor Constraint with Circumstellar Material for the Magnetar-hosting Supernova Remnant RCW 103
Progenitor Constraint with Circumstellar Material for the Magnetar-hosting Supernova Remnant RCW 103 Open
Stellar winds blown out from massive stars (≳10 M ⊙ ) contain precious information on the progenitor itself, and in this context the most important elements are carbon (C), nitrogen (N), and oxygen (O), which are produced by the CNO cycle …