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The bulk motion of gas in the core of the Centaurus galaxy cluster
XRISM collaboration
Galaxy clusters, the largest gravitationally bound structures in the Universe, contain vast amounts of dark matter, galaxies, and hot ionised gas known as the intracluster medium (…
The XRISM/Resolve view of the Fe K region of Cyg X-3
XRISM Collaboration
The X-ray binary system Cygnus X-3 (4U 2030+40, V1521 Cyg) is luminous but enigmatic owing to the high intervening absorption. High-resolution X-ray spectroscopy uniquely probes th…
A broadband X-ray imaging spectroscopy in the 2030s: the FORCE mission
Koji Mori, Takeshi G. Tsuru, Kazuhiro Nakazawa +49
In this multi-messenger astronomy era, all the observational probes are improving their sensitivities and overall performance. The Focusing on Relativistic universe and Cosmic Evol…
Discovery of Year-Scale Time Variability from Thermal X-ray Emission in Tycho's Supernova Remnant
Masamune Matsuda, Hiroyuki Uchida, Takaaki Tanaka +2
Mechanisms of particle heating are crucial to understanding the shock physics in supernova remnants (SNRs). However, there has been little information on time variabilities of ther…
An Expanding Shell of Neutral Hydrogen Associated with SN 1006: Hints for the Single-Degenerate Origin and Faint Hadronic Gamma-Rays
H. Sano, H. Yamaguchi, M. Aruga +4
We report new HI observations of the Type Ia supernova remnant SN 1006 using the Australia Telescope Compact Array with an angular resolution of (2 pc at t…
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…
Discovery of the Highly-Neutronized Ejecta Clump with Enhanced Abundances of Titanium and Chromium in the Type Ia Supernova Remnant 3C 397
Yuken Ohshiro, Hiroya Yamaguchi, Shing-Chi Leung +7
The supernova remnant (SNR) 3C 397 is thought to originate from a Type Ia supernova (SN Ia) explosion of a near-Chandrasekhar-mass () progenitor, based on the enhanced…
Discovery of Double-Ring Structure in the Supernova Remnant N103B: Evidence for Bipolar Winds from a Type Ia Supernova Progenitor
Hiroya Yamaguchi, Fabio Acero, Chuan-Jui Li +1
The geometric structure of supernova remnants (SNR) provides a clue to unveiling the pre-explosion evolution of their progenitors. Here we present an X-ray study of N103B (0509-68.…
Rapid Deceleration of Blast Waves Witnessed in Tycho's Supernova Remnant
Takaaki Tanaka, Tomoyuki Okuno, Hiroyuki Uchida +4
In spite of their importance as standard candles in cosmology and as major major sites of nucleosynthesis in the Universe, what kinds of progenitor systems lead to type Ia supernov…
Plasma Diagnostics of the Supernova Remnant N132D Using Deep XMM-Newton Observations with the Reflection Grating Spectrometer
Hitomi Suzuki, Hiroya Yamaguchi, Manabu Ishida +4
We present XMM-Newton observations of N132D, the X-ray brightest supernova remnant (SNR) in the Large Magellanic Cloud (LMC), using the Reflection Grating Spectrometer (RGS) that e…
Element Stratification in the Middle-Aged Type Ia Supernova Remnant G344.7-0.1
Kotaro Fukushima, Hiroya Yamaguchi, Patrick O. Slane +7
Despite their importance, a detailed understanding of Type Ia supernovae (SNe Ia) remains elusive. X-ray measurements of the element distributions in supernova remnants (SNRs) offe…
Uniform distribution of the extremely overionized plasma associated with the supernova remnant G359.1-0.5
Hiromasa Suzuki, Aya Bamba, Rei Enokiya +3
We report on the results of our detailed analyses on the peculiar recombining plasma of the supernova remnant (SNR) G359.10.5, and the interacting CO clouds. Combining {\it Chan…
A Nucleosynthetic Origin for the Southwestern Fe-rich Structure in Kepler's Supernova Remnant
Toshiki Sato, Eduardo Bravo, Carles Badenes +3
{\it Chandra} X-ray observations of Kepler's supernova remnant indicate the existence of a high speed Fe-rich ejecta structure in the southwestern region. We report strong K-shell…
Deep XMM-Newton Observations Reveal the Origin of Recombining Plasma in the Supernova Remnant W44
Hiromichi Okon, Takaaki Tanaka, Hiroyuki Uchida +8
Recent X-ray studies revealed over-ionized recombining plasmas (RPs) in a dozen mixed-morphology (MM) supernova remnants (SNRs). However, the physical process of the over-ionizatio…
Probe for Type Ia supernova progenitor in decihertz gravitational wave astronomy
Tomoya Kinugawa, Hiroki Takeda, Ataru Tanikawa +1
It is generally believed that Type Ia supernovae are thermonuclear explosions of carbon-oxygen white dwarfs (WDs). However, there is currently no consensus regarding the events lea…
Astro2020 Science White Paper: Future X-ray Studies of Supernova Remnants
Brian J. Williams, Katie Auchettl, Carles Badenes +13
This is a white paper submitted in response to the call from the Astro2020 Decadal Survey Committee. We outline the scientific progress that will be made in the next few decades in…
The Advanced X-ray Imaging Satellite
Richard F. Mushotzky, James Aird, Amy J. Barger +41
Much of the baryonic matter in the Universe, including the most active and luminous sources, are best studied in the X-ray band. Key advances in X-ray optics and detectors have pav…
Evidence for Rapid Adiabatic Cooling as an Origin of the Recombining Plasma in the Supernova Remnant W49B Revealed by NuSTAR Observations
Hiroya Yamaguchi, Takaaki Tanaka, Daniel R. Wik +8
X-ray observations of supernova remnants (SNRs) in the last decade have shown that the presence of recombining plasmas is somewhat common in a certain type of object. The SNR W49B…
X-ray spectroscopy of galaxy clusters: beyond the CIE modeling
Liyi Gu, Irina Zhuravleva, Eugene Churazov +3
X-ray spectra of galaxy clusters are dominated by the thermal emission from the hot intracluster medium. In some cases, besides the thermal component, spectral models require addit…
NuSTAR Detection of Nonthermal Bremsstrahlung from the Supernova Remnant W49B
Takaaki Tanaka, Hiroya Yamaguchi, Daniel R. Wik +10
We report on NuSTAR observations of the mixed morphology supernova remnant (SNR) W49B, focusing on its nonthermal emission. Whereas radio observations as well as recent gamma-ray o…
Detection of polarized gamma-ray emission from the Crab nebula with Hitomi Soft Gamma-ray Detector
Hitomi Collaboration, Felix Aharonian, Hiroki Akamatsu +191
We present the results from the Hitomi Soft Gamma-ray Detector (SGD) observation of the Crab nebula. The main part of SGD is a Compton camera, which in addition to being a spectrom…
Asymmetric Expansion of the Fe ejecta in Kepler's Supernova Remnant
Tomoaki Kasuga, Toshiki Sato, Koji Mori +2
The ejecta kinematics of supernova remnants (SNRs) is one of crucial clues to understand the explosion mechanism of type Ia supernovae (SNe). In particular, the kinematic asymmetry…
Chandrasekhar and sub-Chandrasekhar models for the X-ray emission of Type Ia supernova remnants (I): Bulk properties
Héctor Martínez-Rodríguez, Carles Badenes, Shiu-Hang Lee +9
Type Ia supernovae originate from the explosion of carbon-oxygen white dwarfs in binary systems, but the exact nature of their progenitors remains elusive. The bulk properties of T…
The Transition from Young to Middle-aged Supernova Remnants: Thermal and Nonthermal Aspects of SNR N132D
Aya Bamba, Yutaka Ohira, Ryo Yamazaki +8
Supernova remnants (SNRs) are the primary candidate of Galactic cosmic-ray accelerators. It is still an open issue when and how young SNRs, which typically exhibit strong synchrotr…