Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Leiden Observatory3.6k papers
- Centre National de la Recherche ScientifiqueFR2.4k papers
- Max Planck Institute for AstronomyDE1.4k papers
- European Southern ObservatoryCL1.4k papers
- Max Planck Institute for Extraterrestrial PhysicsDE1.3k papers
- California Institute of TechnologyUS1.1k papers
- University of GroningenNL1.1k papers
- Center for Astrophysics Harvard & SmithsonianUS1k papers
- Royal ObservatoryGB942 papers
- University of AmsterdamNL941 papers
- University College LondonGB886 papers
- University of CambridgeGB870 papers
26 papers · 2 filters
Resolved Magnetic-Field Structure and Variability Near the Event Horizon of Sagittarius A*
Michael D. Johnson, Vincent L. Fish, Sheperd S. Doeleman +45
Near a black hole, differential rotation of a magnetized accretion disk is thought to produce an instability that amplifies weak magnetic fields, driving accretion and outflow. The…
Searching for decaying dark matter in deep XMM-Newton observation of the Draco dwarf spheroidal
Oleg Ruchayskiy, Alexey Boyarsky, Dmytro Iakubovskyi +6
We present results of a search for the 3.5 keV emission line in our recent very long (~ 1.4 Ms) XMM-Newton observation of the Draco dwarf spheroidal galaxy. The astrophysical X-ray…
A novel scenario for the possible X-ray line feature at ~3.5 keV: Charge exchange with bare sulfur ions
L. Gu, J. Kaastra, A. J. J. Raassen +4
Motivated by recent claims of a compelling ~3.5 keV emission line from nearby galaxies and galaxy clusters, we investigate a novel plasma model incorporating a charge exchange comp…
Probing the photoionised outflow in the NLS1 Ark 564: An XMM-Newton view
Shourya Khanna, Jelle. S. Kaastra, Missagh Mehdipour
We present a detailed analysis of xmm X-ray observations of the Narrow line Seyfert-1 (NLS1) galaxy Ark 564 taken between 2000 and 2011. High-resolution X-ray spectroscopy is carri…
The contribution of young core-collapse supernova remnants to the X-ray emission near quiescent supermassive black holes
Alex Rimoldi, Elena Maria Rossi, Elisa Costantini +1
Appreciable star formation, and, therefore, numerous massive stars, are frequently found near supermassive black holes (SMBHs). As a result, core-collapse supernovae in these regio…
Bad prospects for the detection of giant stars' tidal disruption: effect of the ambient medium on bound debris
Clément Bonnerot, Elena M. Rossi, Giuseppe Lodato
Most massive galaxies are thought to contain a supermassive black hole in their centre surrounded by a tenuous gas environment, leading to no significant emission. In these quiesce…
Wide-Band, Low-Frequency Pulse Profiles of 100 Radio Pulsars with LOFAR
M. Pilia, J. W. T. Hessels, B. W. Stappers +84
LOFAR offers the unique capability of observing pulsars across the 10-240 MHz frequency range with a fractional bandwidth of roughly 50%. This spectral range is well-suited for stu…
Flows of X-ray gas reveal the disruption of a star by a massive black hole
Jon M. Miller, Jelle S. Kaastra, M. Coleman Miller +18
Tidal forces close to massive black holes can violently disrupt stars that make a close approach. These extreme events are discovered via bright X-ray and optical/UV flares in gala…
Coherent timing of the accreting millisecond pulsar NGC 6440 X-2
Peter Bult, Alessandro Patruno, Michiel van der Klis
We study the 205.9 Hz pulsations of the accreting millisecond X-ray pulsar NGC 6440 X-2 across all outbursts observed with the Rossi X-ray Timing Explorer over a period of 800 days…
Simulations of the tidal interaction and mass transfer of a star in an eccentric orbit around an intermediate-mass black hole: the case of HLX-1
Edwin van der Helm, Simon Portegies Zwart, Onno Pols
The X-ray source HLX-1 near the spiral galaxy ESO 243-49 is currently the best intermediate-mass black hole candidate. It has a peak bolometric luminosity of erg s…
Bright vigorous winds as signposts of supermassive black hole birth
Davide Fiacconi, Elena M. Rossi
The formation of supermassive black holes is still an outstanding question. In the quasi-star scenario, black hole seeds experience an initial super-Eddington growth, that in less…
Anatomy of the AGN in NGC 5548: V. A clear view of the X-ray narrow emission lines
M. Whewell, G. Branduardi-Raymont, J. S. Kaastra +15
Context. Our consortium performed an extensive multi-wavelength campaign of the nearby Seyfert 1 galaxy NGC 5548 in 2013-14. The source appeared unusually heavily absorbed in the s…
Optical and X-ray early follow-up of ANTARES neutrino alerts
S. Adrian-Martinez, M. Ageron, A. Albert +137
High-energy neutrinos could be produced in the interaction of charged cosmic rays with matter or radiation surrounding astrophysical sources. Even with the recent detection of extr…
X-ray study of the double radio relic galaxy cluster CIZA J2242.8+5301
H. Akamatsu, R. J. van Weeren, G. A. Ogrean +7
Content: We present the results from observations of the merging cluster of galaxies CIZA J2242.8+5301 at =0.192. Aims. To study the physics of gas heating and particle…
230 GHz VLBI observations of M87: event-horizon-scale structure at the enhanced very-high-energy -ray state in 2012
Kazunori Akiyama, Ru-Sen Lu, Vincent L. Fish +45
We report on 230 GHz (1.3 mm) VLBI observations of M87 with the Event Horizon Telescope using antennas on Mauna Kea in Hawaii, Mt. Graham in Arizona and Cedar Flat in California. F…
Line absorption of He-like triplet lines by Li-like ions. Caveats of using line ratios of triplets for plasma diagnostics
M. Mehdipour, J. S. Kaastra, A. J. J. Raassen
He-like ions produce distinctive series of triplet lines under various astrophysical conditions. However, this emission can be affected by line absorption from Li-like ions in the…
Anatomy of the AGN in NGC 5548 IV. The short-term variability of the outflows
L. Di Gesu, E. Costantini, J. Ebrero +16
During an extensive multiwavelength campaign that we performed in 2013-14 the prototypical Seyfert 1 galaxy NGC 5548 has been found in an unusual condition of heavy and persistent…
Probing Atmospheric Electric Fields in Thunderstorms through Radio Emission from Cosmic-Ray-Induced Air Showers
P. Schellart, T. N. G. Trinh, S. Buitink +71
We present measurements of radio emission from cosmic ray air showers that took place during thunderstorms. The intensity and polarization patterns of these air showers are radical…
The Reflares and Outburst Evolution in the Accreting Millisecond Pulsar SAX J1808.4-3658: a Disk Truncated Near Co-rotation?
A. Patruno, D. Maitra, P. A. Curran +5
The accreting millisecond X-ray pulsar SAX J1808.4--3658 shows peculiar low luminosity states known as "reflares" after the end of the main outburst. During this phase the X-ray lu…
A population study of type II bursts in the Rapid Burster
T. Bagnoli, J. J. M. in 't Zand, C. R. D'Angelo +1
Type II bursts are thought to arise from instabilities in the accretion flow onto a neutron star in an X-ray binary. Despite having been known for almost 40 years, no model can yet…
Another shock for the Bullet cluster, and the source of seed electrons for radio relics
Timothy W. Shimwell, Maxim Markevitch, Shea Brown +5
With Australia Telescope Compact Array observations, we detect a highly elongated Mpc-scale diffuse radio source on the eastern periphery of the Bullet cluster 1E0657-55.8, which w…
Radio-X-ray Synergy to discover and Study Jetted Tidal Disruption Events
I. Donnarumma, E. M. Rossi
Observational consequences of tidal disruption of stars (TDEs) by supermassive black holes (SMBHs) can enable us to discover quiescent SMBHs, constrain their mass function, study f…
The fate of supernova remnants near quiescent supermassive black holes
Alex Rimoldi, Elena M. Rossi, Tsvi Piran +1
There is mounting observational evidence that most galactic nuclei host both supermassive black holes (SMBHs) and young populations of stars. With an abundance of massive stars, co…
Anatomy of the AGN in NGC 5548: I. A global model for the broadband spectral energy distribution
M. Mehdipour, J. S. Kaastra, G. A. Kriss +24
An extensive multi-satellite campaign on NGC 5548 has revealed this archetypal Seyfert-1 galaxy to be in an exceptional state of persistent heavy absorption. Our observations taken…