8.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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41 papers · 2 filters
First M87 Event Horizon Telescope Results. IX. Detection of Near-horizon Circular Polarization
The Event Horizon Telescope Collaboration
Event Horizon Telescope (EHT) observations have revealed a bright ring of emission around the supermassive black hole at the center of the M87 galaxy. EHT images in linear polariza…
Polarimetric Geometric Modeling for mm-VLBI Observations of Black Holes
Freek Roelofs, Michael D. Johnson, Andrew Chael +4
The Event Horizon Telescope (EHT) is a millimeter very long baseline interferometry (VLBI) array that has imaged the apparent shadows of the supermassive black holes M87* and Sagit…
First Sagittarius A* Event Horizon Telescope Results. VI: Testing the Black Hole Metric
The Event Horizon Telescope Collaboration
Astrophysical black holes are expected to be described by the Kerr metric. This is the only stationary, vacuum, axisymmetric metric, without electromagnetic charge, that satisfies…
First Sagittarius A* Event Horizon Telescope Results. III: Imaging of the Galactic Center Supermassive Black Hole
The Event Horizon Telescope Collaboration
We present the first event-horizon-scale images and spatiotemporal analysis of Sgr A* taken with the Event Horizon Telescope in 2017 April at a wavelength of 1.3 mm. Imaging of Sgr…
First Sagittarius A* Event Horizon Telescope Results. V. Testing Astrophysical Models of the Galactic Center Black Hole
The Event Horizon Telescope Collaboration
In this paper, we provide a first physical interpretation for the Event Horizon Telescope (EHT)'s 2017 observations of Sgr A*. Our main approach is to compare resolved EHT data at…
First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
The Event Horizon Telescope Collaboration
We present the first Event Horizon Telescope (EHT) observations of Sagittarius A* (Sgr A), the Galactic center source associated with a supermassive black hole. These observati…
First Sagittarius A* Event Horizon Telescope Results. IV. Variability, Morphology, and Black Hole Mass
The Event Horizon Telescope Collaboration
In this paper we quantify the temporal variability and image morphology of the horizon-scale emission from Sgr A*, as observed by the EHT in 2017 April at a wavelength of 1.3 mm. W…
First Sagittarius A* Event Horizon Telescope Results. II. EHT and Multi-wavelength Observations, Data Processing, and Calibration
The Event Horizon Telescope Collaboration
We present Event Horizon Telescope (EHT) 1.3 mm measurements of the radio source located at the position of the supermassive black hole Sagittarius A* (Sgr A*), collected during th…
Searches for neutrino counterparts of gravitational waves from the LIGO/Virgo third observing run with KM3NeT
KM3NeT Collaboration, S. Aiello, A. Albert +273
The KM3NeT neutrino telescope is currently being deployed at two different sites in the Mediterranean Sea. First searches for astrophysical neutrinos have been performed using data…
Ultraluminous X-ray sources are beamed
Jean-Pierre Lasota, Andrew King
We show that magnetar models for ULX behaviour have serious internal inconsistencies. The magnetic fields required to increase the limiting luminosity for radiation pressure above…
Searches for neutrinos in the direction of radio-bright blazars with the ANTARES telescope
ANTARES Collaboration, A. Albert, S. Alves +162
Active galaxies, especially blazars, are among the most promising neutrino source candidates. To date, ANTARES searches for these objects considered GeV-TeV -ray bright blazars.…
Time-dependent photoionization spectroscopy of the Seyfert galaxy NGC 3783
Liyi Gu, Jelle Kaastra, Daniele Rogantini +4
We present an investigation into the spectroscopic properties of non-equilibrium photoionization processes operating in a time-evolving mode. Through a quantitative comparison betw…
X-ray eruptions every 22 days from the nucleus of a nearby galaxy
Muryel Guolo, Dheeraj R. Pasham, Michal Zajaček +15
Galactic nuclei showing recurrent phases of activity and quiescence have recently been discovered, with recurrence times as short as a few hours to a day -- known as quasi-periodic…
Prospects for combined analyses of hadronic emission from -ray sources in the Milky Way with CTA and KM3NeT
T. Unbehaun, L. Mohrmann, S. Funk +271
The Cherenkov Telescope Array and the KM3NeT neutrino telescopes are major upcoming facilities in the fields of -ray and neutrino astronomy, respectively. Possible simultaneous…
Density calculations of NGC 3783 warm absorbers using a time-dependent photoionization model
Chen Li, Jelle S. Kaastra, Liyi Gu +1
Outflowing wind as one type of AGN feedback, which involves noncollimated ionized winds prevalent in Seyfert-1 AGNs, impacts their host galaxy by carrying kinetic energy outwards.…
Why are Quasiperiodic Eruptions only Found in Low-Mass Galaxies?
Andrew King
I consider the current sample of galaxy nuclei producing quasiperiodic eruptions (QPEs). If the quasiperiod results from the orbital motion of a star around the central black hole,…
A LOFAR prompt search for radio emission accompanying X-ray flares in GRB 210112A
A. Hennessy, R. L. C. Starling, A. Rowlinson +14
The composition of relativistic gamma-ray burst (GRB) jets and their emission mechanisms are still debated, and they could be matter or magnetically dominated. One way to distingui…
Fundamental scaling relationships revealed in the optical light curves of tidal disruption events
Andrew Mummery, Sjoert van Velzen, Edward Nathan +4
We present fundamental scaling relationships between properties of the optical/UV light curves of tidal disruption events (TDEs) and the mass of the black hole that disrupted the s…
Dimming of Continuum Captured in Mrk 841: New Clues on the Nature of the Soft X-ray Excess
Missagh Mehdipour, Gerard Kriss, Jelle Kaastra +2
We report on a remarkable change in the spectral energy distribution (SED) of Mrk 841, providing new insights on how the soft X-ray excess emission in active galactic nuclei (AGNs)…
Constraining the PG 1553+113 binary hypothesis: interpreting hints of a new, 22-year period
Sagar Adhikari, Pablo Penil, John Ryan Westernacher-Schneider +5
PG 1553+113 is a well-known blazar exhibiting evidence of a -yr quasi-periodic oscillation (QPO) in radio, optical, X-ray, and -ray bands. Since QPO mechanisms often…
Eccentric Minidisks in Accreting Binaries
John Ryan Westernacher-Schneider, Jonathan Zrake, Andrew MacFadyen +1
We show that gas disks around the components of an orbiting binary system (so-called minidisks) may be susceptible to a resonant instability which causes the minidisks to become si…
A search for inter-cluster filaments with LOFAR and eROSITA
D. N. Hoang, M. Brüggen, T. W. Shimwell +13
Cosmological simulations predict the presence of warm hot thermal gas in the cosmic filaments that connect galaxy clusters. This gas is thought to constitute an important part of t…
The most luminous AGN do not produce the majority of the detected stellar-mass black hole binary mergers in the local Universe
Niccolò Veronesi, Elena Maria Rossi, Sjoert van Velzen
Despite the increasing number of Gravitational Wave (GW) detections, the astrophysical origin of Binary Black Hole (BBH) mergers remains elusive. A promising formation channel for…
Extragalactic FXT Candidates Discovered by Chandra (2014-2022)
J. Quirola-Vásquez, F. E. Bauer, P. G. Jonker +9
Extragalactic fast X-ray transients (FXTs) are short flashes of X-ray photons of unknown origin that last a few minutes to hours. We extend the search for extragalactic FXTs from Q…