902 citations · 6.4k across the 108 of their papers we have counts for
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The origin of MeV gamma-ray diffuse emission from the inner Galactic region
Naomi Tsuji, Yoshiyuki Inoue, Hiroki Yoneda +2
The origin of the inner Galactic emission, measured by COMPTEL with a flux of MeV cm s sr in the 1-30 MeV range, has remained unsettled since…
Gamma-Ray Emission in the Seyfert Galaxy NGC 4151: Investigating the Role of Jet and Coronal Activities
Yoshiyuki Inoue, Dmitry Khangulyan
NGC 4151, a nearby Seyfert galaxy, has recently been reported to emit gamma rays in the GeV range, posing an intriguing astrophysical mystery. The star formation rate of NGC 4151 i…
On the Zeeman Effect in Magnetically-Arrested Disks
Yoshiyuki Inoue
Magnetically arrested disk (MAD) has been argued as the key accretion phase to realize the formation of relativistic jets. However, due to the lack of magnetic field measurements o…
MeV Gamma-Ray Source Contribution to the Inner Galactic Diffuse Emission
Naomi Tsuji, Yoshiyuki Inoue, Hiroki Yoneda +2
The origin of the inner Galactic emission, measured by COMPTEL with a flux of in the 1-30 MeV energy range from the…
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…
High energy emission component, population, and contribution to the extragalactic gamma-ray background of gamma-ray emitting radio galaxies
Yasushi Fukazawa, Hiroto Matake, Taishu Kayanoki +2
In this study, we systematically studied the X-ray to GeV gamma-ray spectra of 61 {\it Fermi} Large Area Telescope (LAT) detected radio galaxies. We found an anticorrelation betwee…
Impacts of Jets and Winds From Primordial Black Holes
Volodymyr Takhistov, Philip Lu, Kohta Murase +2
Primordial black holes (PBHs) formed in the early Universe constitute an attractive candidate for dark matter. Within the gaseous environment of the interstellar medium, PBHs with…
A Fundamental Plane in X-ray Binary Activity of External Galaxies
Yoshiyuki Inoue, Kiyoto Yabe, Yoshihiro Ueda
We construct a new catalog of extragalactic X-ray binaries (XRBs) by matching the latest Chandra source catalog with local galaxy catalogs. Our XRB catalog contains 4430 XRBs hoste…
Cross-match between the latest Swift-BAT and Fermi-LAT catalogs
Naomi Tsuji, Hiroki Yoneda, Yoshiyuki Inoue +4
We report the results of a cross-match study between the hard X-ray and GeV gamma-ray catalogs, by making use of the latest 105-month Swift-BAT and 10-yr Fermi-LAT catalogs, respec…
Gamma-ray and Neutrino Signals from Accretion Disk Coronae of Active Galactic Nuclei
Yoshiyuki Inoue, Dmitry Khangulyan, Akihiro Doi
To explain X-ray spectra of active galactic nuclei (AGN), non-thermal activity in AGN coronae such as pair cascade models has been extensively discussed in the past literature. Alt…
Origin of Galactic Spurs: New Insight from Radio/X-ray All-sky Maps
Jun Kataoka, Marino Yamamoto, Yuki Nakamura +5
In this study, we analyze giant Galactic spurs seen in both radio and X-ray all-sky maps to reveal their origins. We discuss two types of giant spurs: one is the brightest diffuse…
Follow-up Observations for IceCube-170922A: Detection of Rapid Near-Infrared Variability and Intensive Monitoring of TXS 0506+056
Tomoki Morokuma, Yousuke Utsumi, Kouji Ohta +35
We present our follow-up observations to search for an electromagnetic counterpart of the IceCube high-energy neutrino, IceCube-170922A. Monitoring observations of a likely counter…
Snowmass 2021 Letter of Interest: The GRAMS Project: MeV Gamma-Ray Observations and Antimatter-Based Dark Matter Searches
Tsuguo Aramaki, Jonathan Asaadi, Yuto Ichinohe +10
The Gamma-Ray and AntiMatter Survey (GRAMS) project is a proposed next-generation balloon/satellite mission targeting both MeV gamma-ray observations and antimatter-based dark matt…
Blazar Radio and Optical Survey (BROS): A catalog of blazar candidates showing flat radio spectrum and their optical identification in Pan-STARRS1 Surveys
Ryosuke Itoh, Yousuke Utsumi, Yoshiyuki Inoue +5
Utilizing the latest and the most sensitive radio and optical catalogs, we completed a new blazar candidate catalog, Blazar Radio and Optical Survey (BROS), which includes 88,211 s…
Physical Conditions and Particle Acceleration in the Kiloparsec Jet of Centaurus A
Takahiro Sudoh, Dmitry Khangulyan, Yoshiyuki Inoue
The non-thermal emission from the kiloparsec-scale jet of Centaurus A exhibits two notable features, bright diffuse emission and many compact knots, which have been intensively stu…
Cosmological Evolution of Flat-Spectrum Radio Quasars based on the {\it Swift}/BAT 105-month Catalog and Their Contribution to the Cosmic MeV Gamma-ray Background Radiation
Koyo Toda, Yasushi Fukazawa, Yoshiyuki Inoue
We present a new X-ray luminosity function of flat-spectrum radio quasars (FSRQs) utilizing the latest {\it Swift}/BAT 105-month X-ray source catalog. Contrary to previous studies…
Multi-wavelength Emission from Galactic Jets: the Case of the Microquasar SS433
Takahiro Sudoh, Yoshiyuki Inoue, Dmitry Khangulyan
SS433 is a Galactic microquasar with powerful jets, where very-high-energy particles are produced. We study particle acceleration in the jets of SS433 in the light of the recent mu…
On the Origin of High Energy Neutrinos from NGC 1068: The Role of Non-Thermal Coronal Activity
Yoshiyuki Inoue, Dmitry Khangulyan, Akihiro Doi
NGC 1068, a nearby type-2 Seyfert galaxy, is reported as the hottest neutrino spot in the 10-year survey data of IceCube. Although there are several different possibilities for the…
Inverse Compton scattering of starlight in the kiloparsec-scale jet in Centaurus A: The origin of excess TeV -ray emission
Kazuhisa Tanada, Jun Kataoka, Yoshiyuki Inoue
Centaurus A (Cen~A) is the nearest active radio galaxy, which has kiloparsec (kpc) scale jets and {giant lobes detected by various instruments in radio and X-ray frequency ranges}.…
On high-energy particles in accretion disk coronae of supermassive black holes: implications for MeV gamma rays and high-energy neutrinos from AGN cores
Yoshiyuki Inoue, Dmitry Khangulyan, Susumu Inoue +1
Recent observations with ALMA have revealed evidence for non-thermal synchrotron emission from the core regions of two nearby Seyfert galaxies. This suggests that the coronae of ac…
Detection of Coronal Magnetic Activity in Nearby Active Supermassive Black Holes
Yoshiyuki Inoue, Akihiro Doi
Central supermassive black holes of active galactic nuclei host hot plasma with a temperature of K, namely coronae. Like the Sun, black hole coronae are theoretically believ…
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…
High-energy neutrino flare from cloud-jet interaction in the blazar PKS 0502+049
Hao-Ning He, Yoshiyuki Inoue, Susumu Inoue +1
Following the detection of a 300 TeV neutrino potentially associated with the flaring blazar TXS 0506+056, an excess of neutrinos around its position in 2014-2015 was reveale…
X-ray and Gamma-ray Observations of the Fermi Bubbles and NPS/Loop I Structures
Jun Kataoka, Yoshiaki Sofue, Yoshiyuki Inoue +3
The Fermi bubbles were possibly created by large injections of energy into the Galactic Center (GC), either by an active galactic nucleus (AGN) or by nuclear starburst more than ~1…