845 citations · 3.4k across the 97 of their papers we have counts for
74 papers · 1 filter
Accretion spin-up and a strong magnetic field in the slow-spinning Be X-ray binary MAXI J0655-013
Sean N. Pike, Mutsumi Sugizaki, Jakob van den Eijnden +8
We present MAXI and NuSTAR observations of the Be X-ray binary, MAXI J0655-013, in outburst. NuSTAR observed the source once early in the outburst, when spectral analysis yields a…
GRB 221009A: Discovery of an Exceptionally Rare Nearby and Energetic Gamma-Ray Burst
Maia A. Williams, Jamie A. Kennea, S. Dichiara +53
We report the discovery of the unusually bright long-duration gamma-ray burst (GRB), GRB 221009A, as observed by the Neil Gehrels Swift Observatory (Swift), Monitor of All-sky X-ra…
Monitoring observations of SMC X-1's excursions (MOOSE)-II: A new excursion accompanies spin-up acceleration
Chin-Ping Hu, Kristen C. Dage, William I. Clarkson +11
SMC X-1 is a high-mass X-ray binary showing superorbital modulation with an unstable period. Previous monitoring shows three excursion events in 1996--1998, 2005--2007, and 2014--2…
Discovery of a new supergiant fast X-ray transient MAXI J0709-159 associated with the Be star LY CMa
Mutsumi Sugizaki, Tatehiro Mihara, Kohei Kobayashi +10
We report on the discovery of a new supergiant fast X-ray transient (SFXT), MAXI J0709159, and its identification with LY CMa (also known as HD 54786). On 2022 January 25, a new…
Decades' long-term variations in NS-LMXBs observed with MAXI/GSC, RXTE/ASM and Ginga/ASM
Kazumi Asai, Tatehiro Mihara, Masaru Matsuoka
We investigated the decades' long-term X-ray variations in bright low-mass X-ray binaries containing a neutron star (NS-LMXB). The light curves of MAXI/GSC and RXTE/ASM covers $\si…
MAXI and NuSTAR observations of the faint X-ray transient MAXI J1848-015 in the GLIMPSE-C01 Cluster
Sean N. Pike, Hitoshi Negoro, John A. Tomsick +14
We present the results of MAXI monitoring and two NuSTAR observations of the recently discovered faint X-ray transient MAXI J1848-015. Analysis of the MAXI light-curve shows that t…
Discovery and Long-term Broadband X-ray monitoring of Galactic Black Hole Candidate MAXI J1803-298
Megumi Shidatsu, Kohei Kobayashi, Hitoshi Negoro +11
We report the results from the broad-band X-ray monitoring of the new Galactic black hole candidate MAXI J1803298 with the MAXI/GSC and Swift/BAT during its outburst. After the…
Discovery of a strong 6.6 keV emission feature from EXO 1745248 after the superburst in 2011 October
Wataru B. Iwakiri, Motoko Serino, Tatehiro Mihara +4
We discover an unidentified strong emission feature in the X-ray spectrum of EXO 1745248 obtained by RXTE at 40 hr after the peak of a superburst. The structure was centered at…
The RS CVn type star GT Mus shows most energetic X-ray flares throughout the 2010s
Ryo Sasaki, Yohko Tsuboi, Wataru Iwakiri +14
We report that the RS CVn-type star GT Mus (HR 4492, HD 101379 + HD 101380) was the most active star in the X-ray sky in the last decade in terms of the scale of recurrent energeti…
The Peculiar X-ray Transient Swift J0840.7-3516: an Unusual Low Mass X-ray Binary or a Tidal Disruption Event?
Megumi Shidatsu, Wataru Iwakiri, Hitoshi Negoro +9
We report on the X-ray properties of the new transient Swift J0840.73516, discovered with Swift/BAT in 2020 February, using extensive data of Swift, MAXI, NICER, and NuSTAR. The…
A Comprehensive X-ray Report on AT2019wey
Yuhan Yao, S. R. Kulkarni, K. C. Gendreau +25
Here, we present MAXI, SWIFT, NICER, NuSTAR and Chandra observations of the X-ray transient AT2019wey (SRGA J043520.9+552226, SRGE J043523.3+552234). From spectral and timing analy…
X-ray emission evolution of the Galactic ultra-luminous X-ray pulsar Swift J0243.6+6124 during the 2017-2018 outburst observed by the MAXI GSC
Mutsumi Sugizaki, Motoki Oeda, Nobuyuki Kawai +3
This paper reports on the X-ray emission evolution of the ultra-luminous Galactic X-ray pulsar, Swift J0243.6+6124, during the 2017-2018 giant outburst observed by the MAXI GSC. Th…
Insight-HXMT insight into switch of the accretion mode: the case of the X-ray pulsar 4U 1901+03
Y. L. Tuo, L. Ji, S. S. Tsygankov +116
We use the In data collected during the 2019 outburst from X-ray pulsar 4U 1901+03 to complement the orbital parameters reported by Fermi/GBM. Using the Insight-HXMT, we examine th…
Monitoring the Superorbital Period Variation and the Spin Period Evolution of SMC X-1
Chin-Ping Hu, Tatehiro Mihara, Mutsumi Sugizaki +2
The X-ray pulsar SMC X-1 shows a superorbital modulation with an unstable cycle length in the X-ray band. We present its timing behaviors, including the spin, orbital, and superorb…
X-ray and Optical Observations of the Black Hole Candidate MAXI J1828-249
Sonoe Oda, Megumi Shidatsu, Satoshi Nakahira +8
We report results from X-ray and optical observations of the Galactic black hole candidate MAXI J1828-249, performed with Suzaku and the Kanata telescope around the X-ray flux peak…
The 2018 X-ray and Radio Outburst of Magnetar XTE J1810-197
E. V. Gotthelf, J. P. Halpern, J. A. J. Alford +11
We present the earliest X-ray observations of the 2018 outburst of XTE J1810-197, the first outburst since its 2003 discovery as the prototypical transient and radio-emitting anoma…
An application of the Ghosh & Lamb model to the accretion powered X-ray pulsar X Persei
Fumiaki Yatabe, Kazuo Makishima, Tatehiro Mihara +5
The accretion-induced pulse-period changes of the Be/X-ray binary pulsar X Persei were investigated over a period of 1996 January to 2017 September. This study utilized the monitor…
The 7-year MAXI/GSC X-ray Source Catalog in the High Galactic-Latitude Sky (3MAXI)
Taiki Kawamuro, Yoshihiro Ueda, Megumi Shidatsu +28
We present the third MAXI/GSC catalog in the high Galactic-latitude sky () based on the 7-year data from 2009 August 13 to 2016 July 31, complementary to that in th…
MAXI upper limits of the electromagnetic counterpart of GW170817
Satoshi Sugita, Nobuyuki Kawai, Satoshi Nakahira +5
We report the MAXI observation of the gravitational-wave (GW) event GW170817 and the electromagnetic counterpart of GW170817. GW170817 is a binary neutron star coalescence candidat…
Discovery and state transitions of the new Galactic black hole candidate MAXI J1535-571
Satoshi Nakahira, Megumi Shidatsu, Kazuo Makishima +7
We report on the detection and subsequent X-ray monitoring of the new Galactic black hole candidate MAXI J1535-571 with the MAXI/GSC. Afterthe discovery on 2017 September 2 made in…
Correlation between the luminosity and spin-period changes during outbursts of 12 Be binary pulsars observed by the MAXI/GSC and the Fermi/GBM
Mutsumi Sugizaki, Tatehiro Mihara, Motoki Nakajima +1
To observationally study spin-period changes of accreting pulsars caused by the accretion torque, the present work analyzes X-ray light curves of 12 Be binary pulsars obtained by t…
X-ray upper limits of GW150914 with MAXI
Nobuyuki Kawai, Hitoshi Negoro, Motoko Serino +4
We searched for X-ray candidates of the gravitational wave (GW) event GW150914 with Monitor of All-sky X-ray Image (MAXI). MAXI observed the error region of the GW event GW150914 f…
X-ray upper limits of GW151226 with MAXI
Motoko Serino, Nobuyuki Kawai, Hitoshi Negoro +3
The error region of the the gravitational-wave (GW) event GW151226 was observed with Monitor of All-sky X-ray Image (MAXI). MAXI was operated at the time of GW151226, and continuou…
Orbital modulations of X-ray light curves of Cyg X-1 in its low/hard and high/soft states
Juri Sugimoto, Shunji Kitamoto, Tatehiro Mihara +1
The black hole binary Cygnus X-1 has a 5.6 day orbital period. We first detected a clear intensity modulation with the orbital period in its high/soft state with 6 year MAXI data,…