6.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Academia SinicaTW1.4k papers
- National Astronomical Observatory of JapanJP910 papers
- The University of TokyoJP744 papers
- Center for Astrophysics Harvard & SmithsonianUS671 papers
- Centre National de la Recherche ScientifiqueFR668 papers
- European Southern ObservatoryCL490 papers
- California Institute of TechnologyUS470 papers
- The Graduate University for Advanced Studies, SOKENDAIJP427 papers
- Kavli Institute for the Physics and Mathematics of the UniverseJP425 papers
- Jet Propulsion LaboratoryUS360 papers
- Max Planck Institute for AstronomyDE342 papers
- Leiden UniversityNL340 papers
27 papers · 2 filters
Faraday rotation in the jet of M87 inside the Bondi radius: indication of winds from hot accretion flows confining the relativistic jet
Jongho Park, Kazuhiro Hada, Motoki Kino +3
We study Faraday rotation in the jet of M87 inside the Bondi radius using eight Very Long Baseline Array data sets, one at 8 GHz, four at 5 GHz, and three at 2 GHz. We obtain Farad…
Line-of-sight gas sloshing in the cool core of Abell 907
Shutaro Ueda, Yuto Ichinohe, Tetsu Kitayama +1
We present line-of-sight gas sloshing first found in a cool core in a galaxy cluster. The galaxy cluster Abell 907 is identified as a relaxed cluster owing to its global X-ray surf…
FRB 121102 Bursts Show Complex Time-Frequency Structure
J. W. T. Hessels, L. G. Spitler, A. D. Seymour +23
FRB 121102 is the only known repeating fast radio burst source. Here we analyze a wide-frequency-range (1-8 GHz) sample of high-signal-to-noise, coherently dedispersed bursts detec…
Very High-Energy Emission from the Direct Vicinity of Rapidly Rotating Black Holes
Kouichi Hirotani
When a black hole accretes plasmas at very low accretion rate, an advection-dominated accretion flow (ADAF) is formed. In an ADAF, relativistic electrons emit soft gamma-rays via B…
Parabolic Jets from the Spinning Black Hole in M87
Masanori Nakamura, Keiichi Asada, Kazuhiro Hada +18
The M87 jet is extensively examined by utilizing general relativistic magnetohydrodynamic (GRMHD) simulations as well as the steady axisymmetric force-free electrodynamic (FFE) sol…
ALMA Polarimetry of Sgr A*: Probing the Accretion Flow from the Event Horizon to the Bondi Radius
Geoffrey C. Bower, Avery Broderick, Jason Dexter +10
Millimeter polarimetry of Sgr A* probes the linearly polarized emission region on a scale of Schwarzschild radii () as well as the dense, magnetized accretion flow o…
Science with an ngVLA: Tidal disruption events
Sjoert van Velzen, Geoffrey C. Bower, Brian D. Metzger
The tidal disruption and subsequent accretion of a star by a supermassive black hole can be used as a laboratory to study the physics of relativistic jets. The ngVLA is the only pl…
Galactic Center Pulsars with the ngVLA
Geoffrey C. Bower, Shami Chatterjee, Jim Cordes +9
Pulsars in the Galactic Center (GC) are important probes of General Relativity, star formation, stellar dynamics, stellar evolution, and the interstellar medium. Despite years of s…
High-energy and very-high-energy emission from stellar-mass black holes moving in gaseous clouds
Kouichi Hirotani, Hung-Yi Pu, Sabrina Outmani +5
We investigate the electron-positron pair cascade taking place in the magnetosphere of a rapidly rotating black hole. Because of the spacetime frame dragging, the Goldreich-Julian…
A Detailed Study of the Most Relaxed SPT-Selected Galaxy Clusters: Cool Core and Central Galaxy Properties
M. McDonald, S. W. Allen, J. Hlavacek-Larrondo +14
We present a multi-wavelength analysis of the four most relaxed clusters in the South Pole Telescope 2500 deg^2 survey, which lie at 0.55 < z < 0.75. This study, which utilizes new…
Magnetic field estimates from the X-ray synchrotron emitting rims of the 30 Dor C superbubble and the implications for the nature of 30 Dor C's TeV emission
Patrick J. Kavanagh, Jacco Vink, Manami Sasaki +6
The 30 Dor C superbubble is unique for its synchrotron X-ray shell, as well as being the first superbubble to be detected in TeV -rays, though the dominant TeV emission mechanis…
Cool core disturbed: Observational evidence for coexistence of sub-sonic sloshing gas and stripped shock-heated gas around the core of RX J1347.5-1145
Shutaro Ueda, Tetsu Kitayama, Masamune Oguri +13
RXJ1347.5-1145 (z = 0.451) is one of the most luminous X-ray galaxy clusters, which hosts a prominent cool core and exhibits a signature of a major merger. We present the first dir…
Lightning black holes as unidentified TeV sources
Kouichi Hirotani, Hung-Yi Pu, Satoki Matsushita
Imaging Atmospheric Cherenkov Telescopes have revealed more than 100 TeV sources along the Galactic Plane, around 45% of them remain unidentified. However, radio observations revea…
Detection of Bursts from FRB 121102 with the Effelsberg 100-m Radio Telescope at 5 GHz and the Role of Scintillation
Laura G Spitler, W Herrmann, Geoffrey C Bower +8
FRB 121102, the only repeating fast radio burst (FRB) known to date, was discovered at 1.4 GHz and shortly after the discovery of its repeating nature, detected up to 2.4 GHz. Here…
Fingerprints of heavy element nucleosynthesis in the late-time lightcurves of kilonovae
Meng-Ru Wu, Jennifer Barnes, Gabriel Martinez-Pinedo +1
The kilonova emission observed following the binary neutron star merger event GW170817 provided the first direct evidence for the synthesis of heavy nuclei through the r-process. T…
Probing the innermost accretion flow geometry of Sgr A* with Event Horizon Telescope
Hung-Yi Pu, Avery E. Broderick
Upcoming Event Horizon Telescope (EHT) observations will provide a unique opportunity to reveal the innermost region of the radiative inefficient accretion flow (RIAF) around the G…
Constraints on the Chemical Enrichment History of the Perseus Cluster of Galaxies from High-Resolution X-ray Spectroscopy
A. Simionescu, S. Nakashima, H. Yamaguchi +32
High-resolution spectroscopy of the core of the Perseus Cluster of galaxies, using the satellite above 2 keV and the - Reflection Grating Spectrometer at lowe…
Collimation, Acceleration and Recollimation Shock in the Jet of Gamma-Ray-emitting Radio-Loud Narrow-Line Seyfert 1 Galaxy 1H 0323+342
Kazuhiro Hada, Akihiro Doi, Kiyoaki Wajima +6
We investigated the detailed radio structure of the jet of 1H 0323+342 using high-resolution multi-frequency Very Long Baseline Array observations. This source is known as the near…
The 1.4 mm core of Centaurus A: First VLBI results with the South Pole Telescope
Junhan Kim, Daniel P. Marrone, Alan L. Roy +27
Centaurus A (Cen A) is a bright radio source associated with the nearby galaxy NGC 5128 where high-resolution radio observations can probe the jet at scales of less than a light-da…
The growth of stellar mass black hole binaries trapped in an accretion disk of active galactic nuclei
Shu-Xu Yi, K. S. Cheng, Ronald E. Taam
Among the four black hole binary merger events detected by LIGO, six progenitor black holes have masses greater than 20\,. The existence of such massive BHs calls for extr…
A Model for Spectral States and Their Transition in Cyg X-1
Ronald E. Taam, Erlin Qiao, B. F. Liu +1
A new accretion picture based on a small disk surrounding a black hole is developed for the wind-fed source Cyg X-1. The hard and soft spectral states of Cyg X-1 are interpreted in…
A Model for Anisotropic Interstellar Scattering and its Application to Sgr A*
Dimitrios Psaltis, Michael Johnson, Ramesh Narayan +3
Scattering in the ionized interstellar medium is commonly observed to be anisotropic, with theories of magnetohydrodynamic (MHD) turbulence explaining the anisotropy through a pref…
Highest-frequency detection of FRB 121102 at 4-8 GHz using the Breakthrough Listen Digital Backend at the Green Bank Telescope
V. Gajjar, A. P. V. Siemion, D. C. Price +28
We report the first detections of the repeating fast radio burst source FRB 121102 above 5.2 GHz. Observations were performed using the 48 GHz receiver of the Robert C. Byrd Gre…
A Search for Molecular Gas in the Host Galaxy of FRB 121102
Geoffrey C. Bower, Ramprasad Rao, Melanie Krips +9
We present SMA and NOEMA observations of the host galaxy of FRB 121102 in the CO 3-2 and 1-0 transitions, respectively. We do not detect emission from either transition. We set $3σ…