Search Publications
The Abell 3391/95 galaxy cluster system. A 15 Mpc intergalactic medium emission filament, a warm gas bridge, infalling matter clumps, and (re-) accelerated plasma discovered by combining SRG/eROSITA data with ASKAP/EMU and DECam data
Diego, J. M.; Salvato, M.; Nandra, K. +44 more
Context. Inferences about dark matter, dark energy, and the missing baryons all depend on the accuracy of our model of large-scale structure evolution. In particular, with cosmological simulations in our model of the Universe, we trace the growth of structure, and visualize the build-up of bigger structures from smaller ones and of gaseous filamen…
A self-lensing binary massive black hole interpretation of quasi-periodic eruptions
Ingram, Adam; Aigrain, Suzanne; Motta, Sara E. +1 more
Binary supermassive black hole (SMBH) systems result from galaxy mergers, and will eventually coalesce due to gravitational wave (GW) emission if the binary separation can be reduced to ≲0.1 pc by other mechanisms. Here, we explore a gravitational self-lensing binary SMBH model for the sharp (duration ~1 h), quasi-regular X-ray flares - dubbed qua…
In situ multi-spacecraft and remote imaging observations of the first CME detected by Solar Orbiter and BepiColombo
Möstl, C.; Harrison, R. A.; Davies, J. A. +20 more
Context. On 2020 April 19 a coronal mass ejection (CME) was detected in situ by Solar Orbiter at a heliocentric distance of about 0.8 AU. The CME was later observed in situ on April 20 by the Wind and BepiColombo spacecraft whilst BepiColombo was located very close to Earth. This CME presents a good opportunity for a triple radial alignment study,…
Stellar Rotation in the Gaia Era: Revised Open Clusters' Sequences
Pinsonneault, Marc H.; Godoy-Rivera, Diego; Rebull, Luisa M.
The period versus mass diagrams (i.e., rotational sequences) of open clusters provide crucial constraints for angular momentum evolution studies. However, their memberships are often heavily contaminated by field stars, which could potentially bias the interpretations. In this paper, we use data from Gaia DR2 to reassess the memberships of seven o…
Evolution of Solar Wind Turbulence from 0.1 to 1 au during the First Parker Solar Probe-Solar Orbiter Radial Alignment
Telloni, Daniele; Zank, Gary P.; Adhikari, Laxman +41 more
The first radial alignment between Parker Solar Probe and Solar Orbiter spacecraft is used to investigate the evolution of solar wind turbulence in the inner heliosphere. Assuming ballistic propagation, two 1.5 hr intervals are tentatively identified as providing measurements of the same plasma parcels traveling from 0.1 to 1 au. Using magnetic fi…
MUSE analysis of gas around galaxies (MAGG) - III. The gas and galaxy environment of z = 3-4.5 quasars
Fynbo, J. P. U.; Fossati, M.; Lusso, E. +9 more
We present a study of the environment of 27 z = 3-4.5 bright quasars from the MUSE Analysis of Gas around Galaxies (MAGG) survey. With medium-depth Multi Unit Spectroscopic Explorer (MUSE) observations (4 h on target per field), we characterize the effects of quasars on their surroundings by studying simultaneously the properties of extended gas n…
Rapid Accretion State Transitions following the Tidal Disruption Event AT2018fyk
Wevers, T.; Uttley, P.; Miller-Jones, J. C. A. +7 more
Following a tidal disruption event (TDE), the accretion rate can evolve from quiescent to near-Eddington levels and back over timescales of months to years. This provides a unique opportunity to study the formation and evolution of the accretion flow around supermassive black holes (SMBHs). We present 2 yr of multiwavelength monitoring observation…
Dust temperature in ALMA [C II]-detected high-z galaxies
Zanella, A.; Ferrara, A.; Vallini, L. +4 more
At redshift z > 5, the far-infrared (FIR) continuum spectra of main-sequence galaxies are sparsely sampled, often with a single data point. The dust temperature Td,SED, thus has to be assumed in the FIR continuum fitting. This introduces large uncertainties regarding the derived dust mass (Md), FIR luminosity, and obscured…
Rapid Variability of Sgr A* across the Electromagnetic Spectrum
Morris, Mark R.; Smith, Howard A.; Fazio, G. G. +17 more
Sagittarius A* (Sgr A*) is the variable radio, near-infrared (NIR), and X-ray source associated with accretion onto the Galactic center black hole. We have analyzed a comprehensive submillimeter (including new observations simultaneous with NIR monitoring), NIR, and 2-8 keV data set. Submillimeter variations tend to lag those in the NIR by ~30 min…
Double-lined Spectroscopic Binaries in the APOGEE DR16 and DR17 Data
Bizyaev, Dmitry; Brownstein, Joel R.; Pan, Kaike +25 more
APOGEE spectra offer ≲1 km s-1 precision in the measurement of stellar radial velocities. This holds even when multiple stars are captured in the same spectrum, as happens most commonly with double-lined spectroscopic binaries (SB2s), although random line-of-sight alignments of unrelated stars can also occur. We develop a code that auto…