Search Publications
A Glimpse of the Stellar Populations and Elemental Abundances of Gravitationally Lensed, Quiescent Galaxies at z ≳ 1 with Keck Deep Spectroscopy
Allen, Rebecca J.; Kacprzak, Glenn G.; Glazebrook, Karl +13 more
Gravitational lenses can magnify distant galaxies, allowing us to discover and characterize the stellar populations of intrinsically faint, quiescent galaxies that are otherwise extremely difficult to directly observe at high redshift from ground-based telescopes. Here, we present the spectral analysis of two lensed, quiescent galaxies at z ≳ 1 di…
Impact of the Galactic bar on tidal streams within the Galactic disc. The case of the tidal stream of the Hyades
Laporte, Chervin F. P.; de Laverny, Patrick; Famaey, Benoit +5 more
Tidal streams of disrupted clusters are powerful probes of the gravitational potential of the Galaxy and they are routinely detected in the stellar halo of the Milky Way. It was recently shown that tidal streams of open clusters can now also be detected within the Milky Way disc. In this work, we highlight the fact that disc tidal streams also pro…
The formation history of our Galaxy's nuclear stellar disc constrained from HST observations of the Quintuplet field
Rich, R. M.; Lu, J.; Nogueras-Lara, F. +9 more
Context. Until recently it was thought that the nuclear stellar disc at the centre of our Galaxy was formed via quasi-continuous star formation over billions of years. However, an analysis of GALACTICNUCLEUS survey data indicates that > 80% of the mass of the stellar disc formed at least 8 Gyr ago and about 5% roughly 1 Gyr ago.
Aims: Our …
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…