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Joint H.E.S.S. and Fermi-LAT analysis of the region around PSR J1813-1749
T. Wach, A. M. W. Mitchell, V. Joshi +1
HESS J1813-178 is one of the brightest sources detected during the first HESS Galactic Plane survey. The compact source, also detected by MAGIC, is believed to be a pulsar wind neb…
H.E.S.S. realtime follow-ups of IceCube high-energy neutrino alerts
Federica Bradascio, Halim Ashkar, Jowita Borowska +5
The evidence for multi-messenger photon and neutrino emission from the blazar TXS 0506+056 has demonstrated the importance of realtime follow-up of neutrino events by various groun…
Modelling of highly extended Gamma-ray emission around the Geminga Pulsar as detected with H.E.S.S
A. M. W. Mitchell, S. Caroff
Geminga is an enigmatic radio-quiet gamma-ray pulsar located at a mere 250 pc distance from Earth. Extended very-high-energy gamma-ray emission around the pulsar has been detected…
Progenitor constraint with circumstellar material for the magnetar-hosting supernova remnant RCW 103
Takuto Narita, Hiroyuki Uchida, Takashi Yoshida +2
Stellar winds blown out from massive stars () contain precious information on the progenitor itself, and in this context, the most important elements are carbo…
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…
Particle acceleration controlled by ambient density in the southwestern rim of RCW 86
Hiromasa Suzuki, Satoru Katsuda, Takaaki Tanaka +3
Particle acceleration physics at supernova remnant (SNR) shocks is one of the most intriguing problems in astrophysics. SNR RCW~86 provides a suitable environment for understanding…
Spatially resolved study of the SS 433/W50 west region with Chandra: X-ray structure and spectral variation of non-thermal emission
Kazuho Kayama, Takaaki Tanaka, Hiroyuki Uchida +6
The X-ray binary SS 433, embedded in the W50 nebula (or supernova remnant W50), shows bipolar jets that are ejected with mildly relativistic velocities, and extend toward the east…
Charge Exchange X-ray Emission Detected in Multiple Shells of Supernova Remnant G296.1-0.5
Yukiko Tanaka, Hiroyuki Uchida, Takaaki Tanaka +5
Recent high-resolution X-ray spectroscopy revealed possible presence of charge exchange (CX) X-ray emission in supernova remnants (SNRs). Although CX is expected to take place at o…
High resolution X-ray study of supernova remnant J0453.66829 with unusually high forbidden-to-resonance ratio
Yosuke Koshiba, Hiroyuki Uchida, Takaaki Tanaka +3
Recent high-resolution X-ray spectroscopy has revealed that several supernova remnants (SNRs) in the Large Magellanic Cloud (LMC) show unusually high forbidden-to-resonance ()…
Investigation of the Physical Origin of Overionized Recombining Plasma in the Supernova Remnant IC 443 with XMM-Newton
Hiromichi Okon, Takaaki Tanaka, Hiroyuki Uchida +4
The physical origin of the overionized recombining plasmas (RPs) in supernova remnants (SNRs) has been attracting attention because its understanding provides new insight into SNR…
The young massive stellar cluster Westerlund 1 in rays as seen with H.E.S.S
Lars Mohrmann, Andreas Specovius, Romed Rauth +2
Massive stellar clusters have recently been hypothesised as candidates for the acceleration of hadronic cosmic rays up to PeV energies. Previously, the H.E.S.S. Collaboration has r…
Detection of extended TeV emission around the Geminga pulsar with H.E.S.S
A. M. W. Mitchell, S. Caroff, J. Hinton +1
Highly extended gamma-ray emission around the Geminga pulsar was discovered by Milagro and verified by HAWC. Despite many observations with Imaging Atmospheric Cherenkov Telescopes…
Detection of new Extreme BL Lac objects with H.E.S.S. and Swift XRT
Mathieu de Bony de Lavergne, Tomas Bylund, Manuel Meyer +2
Extreme high synchrotron peaked blazars (EHBLs) are amongst the most powerful accelerators found in nature. Usually the synchrotron peak frequency of an EHBL is above Hz…
Evidence of 100 TeV -ray emission from HESS J1702-420: A new PeVatron candidate
H. Abdalla, F. Aharonian, F. Ait Benkhali +232
The identification of PeVatrons, hadronic particle accelerators reaching the knee of the cosmic ray spectrum (few eV), is crucial to understand the origin of cosmic rays…
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…
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…
Shock-Cloud Interaction in the Southwestern Rim of RX J1713.73946 Evidenced by Chandra X-ray Observations
Takaaki Tanaka, Hiroyuki Uchida, Hidetoshi Sano +1
We report on results of Chandra X-ray observations of the southwestern part of the supernova remnant (SNR) RX J1713.73946. We measure proper motions of two X-ray bright blobs, n…
Temporal and Spatial Variation of Synchrotron X-ray Stripes in Tycho's Supernova Remnant
Masamune Matsuda, Takaaki Tanaka, Hiroyuki Uchida +2
The synchrotron X-ray "stripes" discovered in Tycho's supernova remnant (SNR) have been attracting attention since they may be evidence for proton acceleration up to PeV. We analyz…
Probing Cosmic Rays with Fe K Line Structures Generated by Multiple Ionization Process
Hiromichi Okon, Makoto Imai, Takaaki Tanaka +2
Supernova remnants (SNRs) have been regarded as major acceleration sites of Galactic cosmic rays. Recent X-ray studies revealed neutral Fe K line emission from dense gas in the…
Evidence for Resonance Scattering in the X-ray Grating Spectrum of the Supernova Remnant N49
Yuki Amano, Hiroyuki Uchida, Takaaki Tanaka +2
Resonance scattering (RS) is an important process in astronomical objects, because it affects measurements of elemental abundances and distorts surface brightness of the object. It…
Time Variability of Nonthermal X-ray Stripes in Tycho's Supernova Remnant with Chandra
Tomoyuki Okuno, Takaaki Tanaka, Hiroyuki Uchida +4
Analyzing Chandra data of Tycho's supernova remnant (SNR) taken in 2000, 2003, 2007, 2009, and 2015, we search for time variable features of synchrotron X-rays in the southwestern…
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…
Combined Dark Matter searches towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, HESS, MAGIC and VERITAS
Louise Oakes, Celine Armand, Eric Charles +13
The search for Dark Matter (DM) has great potential to reveal physics beyond the Standard Model. As such, searches for evidence of DM particles are being carried out using a wide r…