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Investigating the turbulent hot gas in X-COP galaxy clusters
Pointecouteau, E.; Eckert, D.; Ettori, S. +3 more
Context. Turbulent processes at work in the intracluster medium perturb this environments, impacting its properties, displacing gas, and creating local density fluctuations that can be quantified via X-ray surface brightness fluctuation analyses. Improved knowledge of these phenomena would allow for a more accurate determination of the mass of gal…
Evidence for a Low Lyman Continuum Escape Fraction in Three Massive, Ultraviolet-bright Galaxies at z > 7
Laporte, Nicolas; Katz, Harley; Witten, Callum E. C.
Although low-mass star-forming galaxies are the leading candidates of the reionization process, we cannot conclusively rule out high-mass star-forming galaxies as candidates. While most simulations indicate the former is the best candidate, some models suggest that at z ≥ 6 massive, UV-bright galaxies - "oligarchs" - account for at least 80% of th…
Discovery of a Variable Multiphase Outflow in the X-Ray-emitting Tidal Disruption Event ASASSN-20qc
Tombesi, F.; Kara, E.; Pasham, D. +1 more
Tidal disruption events (TDEs) are exotic transients that can lead to temporary super-Eddington accretion onto a supermassive black hole. Such an accretion mode is naturally expected to result in powerful outflows of ionized matter. However, to date such an outflow has only been directly detected in the X-ray band in a single TDE, ASASSN-14li. Thi…
MUSE-ALMA Haloes - VIII. Statistical study of circumgalactic medium gas
Hayes, M.; Kacprzak, G. G.; Kuntschner, H. +15 more
The distribution of gas and metals in the circumgalactic medium (CGM) plays a critical role in how galaxies evolve. The MUSE-ALMA Haloes survey combines MUSE, ALMA, and HST observations to constrain the properties of the multiphase gas in the CGM and the galaxies associated with the gas probed in absorption. In this paper, we analyse the propertie…
Visual Orbits and Alignments of Planet-hosting Binary Systems
Lester, Kathryn V.; Littlefield, Colin; Howell, Steve B. +7 more
Roughly half of Solar-type planet hosts have stellar companions, so understanding how these binary companions affect the formation and evolution of planets is an important component to understanding planetary systems overall. Measuring the dynamical properties of planet host binaries enables a valuable test of planet formation in multistar systems…
Hypervelocity Stars Track Back to the Galactic Center in Gaia DR3
Shi, Jianrong; Ma, Jun; Du, Cuihua +2 more
Based on the proper motions and radial velocities from Gaia Data Release 3, we identify two hypervelocity stars (HVSs) that may originate from the Galactic center (GC). We select the candidates by first filtering for all Gaia stars with Galactocentric radial velocities >500 km s-1. We also require the candidates cross the Galactic mi…
B-fields and Dust in Interstellar Filaments Using Dust Polarization (BALLAD-POL). I. The Massive Filament G11.11-0.12 Observed by SOFIA/HAWC+
Diep, Pham Ngoc; Hoang, Thiem; Ngoc, Nguyen Bich +8 more
We report the first measurement of polarized thermal dust emission toward the entire infrared dark cloud G11.11-0.12 taken by the polarimeter SOFIA/HAWC+ at 214 µm. The obtained magnetic fields (B-fields) from the polarized emission of the early-stage and massive filament tend to be perpendicular to its spine. We produce a map of B-field str…
Supercritical colliding wind binaries
Romero, Gustavo E.; Abaroa, Leandro; Sotomayor, Pablo
Context. Particle-accelerating colliding-wind binaries (PACWBs) are systems that are formed by two massive and hot stars and produce nonthermal radiation. The key elements of these systems are fast winds and the shocks that they create when they collide. Binaries with nonaccreting young pulsars have also been detected as nonthermal emitters, again…
NGC 2992: Interplay between the multiphase disc, wind, and radio bubbles
Fiore, F.; Massardi, M.; Lapi, A. +13 more
We present an analysis of the gas kinematics in NGC 2992 based on VLT/MUSE, ALMA, and VLA data. Our aim is to characterise the disc, the wind, and their interplay in the cold molecular and warm ionised phases. NGC 2992 is a changing-look Seyfert known to host both a nuclear ultrafast outflow (UFO), and an AGN-driven kiloparsec-scale ionised wind. …
Constraints on the Galactic centre environment from Gaia hypervelocity stars III: insights on a possible companion to Sgr A*
Rossi, E. M.; Castro-Ginard, A.; Marchetti, T. +4 more
We consider a scenario in which Sgr A* is in a massive black hole binary (MBHB) with an as-of-yet undetected supermassive or intermediate-mass black hole companion. Dynamical encounters between this MBHB and single stars in its immediate vicinity would eject hypervelocity stars (HVSs) with velocities beyond the Galactic escape velocity of the Gala…