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A rapidly changing jet orientation in the stellar-mass black-hole system V404 Cygni
Soria, Roberto; Sarazin, Craig L.; Jonker, Peter G. +18 more
Powerful relativistic jets are one of the main ways in which accreting black holes provide kinetic feedback to their surroundings. Jets launched from or redirected by the accretion flow that powers them are expected to be affected by the dynamics of the flow, which for accreting stellar-mass black holes has shown evidence for precession1
The ultra-diffuse galaxy NGC 1052-DF2 with MUSE. I. Kinematics of the stellar body
Emsellem, Eric; Müller, Oliver; Lelli, Federico +14 more
The so-called ultra-diffuse galaxy NGC 1052-DF2 was announced to be a galaxy lacking dark matter based on a spectroscopic study of its constituent globular clusters. Here we present the first spectroscopic analysis of the stellar body of this galaxy using the MUSE integral-field spectrograph at the (ESO) Very Large Telescope. The MUSE datacube sim…
The gravitational force field of the Galaxy measured from the kinematics of RR Lyrae in Gaia
Gerhard, Ortwin; Wegg, Christopher; Bieth, Marie
From a sample of 15651 RR Lyrae with accurate proper motions in Gaia DR2, we measure the azimuthally averaged kinematics of the inner stellar halo between 1.5 and 20 kpc from the Galactic centre. We find that their kinematics are strongly radially anisotropic, and their velocity ellipsoid nearly spherically aligned over this volume. Only in the in…
The Optical Afterglow of GW170817: An Off-axis Structured Jet and Deep Constraints on a Globular Cluster Origin
Berger, E.; Chornock, R.; Laskar, T. +25 more
We present a revised and complete optical afterglow light curve of the binary neutron star merger GW170817, enabled by deep Hubble Space Telescope (HST) F606W observations at ≈584 days post-merger, which provide a robust optical template. The light curve spans ≈110-362 days, and is fully consistent with emission from a relativistic structured jet …
The halo's ancient metal-rich progenitor revealed with BHB stars
Belokurov, Vasily; Evans, N. Wyn; Koposov, Sergey E. +2 more
Using the data from the Sloan Digital Sky Survey and the Gaia satellite, we assemble a pure sample of ∼3000 blue horizontal branch (BHB) stars with 7D information, including positions, velocities, and metallicities. We demonstrate that, as traced with BHBs, the Milky Way's stellar halo is largely unmixed and cannot be well represented with a conve…
Observational constraints on dust disk sizes in tidally truncated protoplanetary disks in multiple systems in the Taurus region
Liu, Y.; Lodato, G.; van der Plas, G. +16 more
The impact of stellar multiplicity on the evolution of planet-forming disks is still the subject of debate. Here we present and analyze disk structures around ten multiple stellar systems that were included in an unbiased, high spatial resolution survey performed with ALMA of 32 protoplanetary disks in the Taurus star-forming region. At the unprec…
Kinematics of the Broad-line Region of 3C 273 from a 10 yr Reverberation Mapping Campaign
Ho, Luis C.; Smith, Paul S.; Zhang, Zhi-Xiang +9 more
Despite many decades of study, the kinematics of the broad-line region of 3C 273 are still poorly understood. We report a new, high signal-to-noise, reverberation mapping campaign carried out from 2008 November to 2018 March that allows the determination of time lags between emission lines and the variable continuum with high precision. The time l…
Sunyaev-Zel'dovich effect and X-ray scaling relations from weak lensing mass calibration of 32 South Pole Telescope selected galaxy clusters
Bayliss, M. B.; Schrabback, T.; von der Linden, A. +28 more
Uncertainty in mass-observable scaling relations is currently the limiting factor for galaxy-cluster-based cosmology. Weak gravitational lensing can provide direct mass calibration and reduce the mass uncertainty. We present new ground-based weak lensing observations of 19 South Pole Telescope (SPT) selected clusters at redshifts 0.29 ≤ z ≤ 0.61 a…
A 100-kiloparsec wind feeding the circumgalactic medium of a massive compact galaxy
Coil, Alison; Moustakas, John; Diamond-Stanic, Aleksandar M. +9 more
Ninety per cent of baryons are located outside galaxies, either in the circumgalactic or intergalactic medium1,2. Theory points to galactic winds as the primary source of the enriched and massive circumgalactic medium3-6. Winds from compact starbursts have been observed to flow to distances somewhat greater than ten kiloparse…
Explosive Magnetotail Activity
Khotyaintsev, Yuri; Velli, Marco; Runov, Andrei +13 more
Modes and manifestations of the explosive activity in the Earth's magnetotail, as well as its onset mechanisms and key pre-onset conditions are reviewed. Two mechanisms for the generation of the pre-onset current sheet are discussed, namely magnetic flux addition to the tail lobes, or other high-latitude perturbations, and magnetic flux evacuation…