Search Publications
The ages and metallicities of the globular clusters in the Sparkler
Adamo, Angela; Claeyssens, Adélaïde; Usher, Christopher +1 more
JWST observations of the strongly lensed galaxy the Sparkler have revealed a population of gravitationally bound globular cluster (GC) candidates. Different analyses have resulted in broadly similar ages but significantly different metallicities, questioning the assembly history that has led to the formation of such a population. In this letter, w…
Dynamics of stellar disc tilting from satellite mergers
Lisanti, Mariangela; Dodge, Benjamin C.; Slone, Oren +1 more
The Milky Way's stellar disc can tilt in response to torques that result from infalling satellite galaxies and their associated tidal debris. In this work, we explore the dynamics of disc tilting by running N-body simulations of mergers in an isolated, isotropic Milky Way-like host galaxy, varying over satellite virial mass, initial position, and …
The effect of the adiabatic assumption on asteroseismic scaling relations for luminous red giants
Stello, Dennis; Pinsonneault, Marc H.; Bildsten, Lars +1 more
Although stellar radii from asteroseismic scaling relations agree at the per cent level with independent estimates for main sequence and most first-ascent red giant branch (RGB) stars, the scaling relations over-predict radii at the tens of per cent level for the most luminous stars ($R \gtrsim 30 \, \mathrm{R}_{\odot }$). These evolved stars have…
RXJ0437+00: constraining dark matter with exotic gravitational lenses
Mahler, Guillaume; Richard, Johan; Massey, Richard +6 more
We present the first strong-gravitational-lensing analysis of the galaxy cluster RX J0437.1+0043 (RXJ0437; z = 0.285). Newly obtained, deep MUSE observations, Keck/MOSFIRE near-infrared spectroscopy, and Hubble Space Telescope SNAPshot imaging reveal 13 multiply imaged background galaxies, three of them (at z = 1.98, 2.97, and 6.02, respectively) …
The Physics of the Accelerating Universe Survey: narrow-band image photometry
Carretero, J.; Castander, F. J.; Crocce, M. +22 more
PAUCam is an innovative optical narrow-band imager mounted at the William Herschel Telescope built for the Physics of the Accelerating Universe Survey (PAUS). Its set of 40 filters results in images that are complex to calibrate, with specific instrumental signatures that cannot be processed with traditional data reduction techniques. In this pape…
Can ultralight dark matter explain the age-velocity dispersion relation of the Milky Way disc: A revised and improved treatment
Chiang, Barry T.; Ostriker, Jeremiah P.; Schive, Hsi-Yu
Ultralight axion-like particles ma ~ 10-22 eV, or Fuzzy Dark Matter (FDM), behave comparably to cold dark matter (CDM) on cosmological scales and exhibit a kpc-size de Broglie wavelength capable of alleviating established (sub-)galactic-scale problems of CDM. Substructures inside an FDM halo incur gravitational potential pert…
Photometric follow-up of 43 new eclipsing white dwarf plus main-sequence binaries from the ZTF survey
Rebassa-Mansergas, Alberto; Parsons, Steven G.; Pelisoli, Ingrid +12 more
Wide-field time-domain photometric sky surveys are now finding hundreds of eclipsing white dwarf plus M dwarf binaries, a population encompassing a wealth of information and potential insight into white dwarf and close binary astrophysics. Precise follow-up observations are essential in order to fully constrain these systems and capitalize on the …
The MAGPI Survey: impact of environment on the total internal mass distribution of galaxies in the last 5 Gyr
D'Eugenio, Francesco; Tran, Kim-Vy H.; Bland-Hawthorn, Joss +20 more
We investigate the impact of environment on the internal mass distribution of galaxies using the Middle Ages Galaxy Properties with Integral field spectroscopy (MAGPI) survey. We use 2D resolved stellar kinematics to construct Jeans dynamical models for galaxies at mean redshift z ~ 0.3, corresponding to a lookback time of 3-4 Gyr. The internal ma…
Spatially resolved chemodynamics of the starburst dwarf galaxy CGCG 007-025: evidence for recent accretion of metal-poor gas
Sánchez-Janssen, Rubén; Amorín, Ricardo; Papaderos, Polychronis +4 more
Nearby metal-poor starburst dwarf galaxies present a unique opportunity to probe the physics of high-density star formation with a detail and sensitivity unmatched by any observation of the high-z Universe. Here, we present the first results from a chemodynamical study of the nearby, gas-rich starburst dwarf CGCG 007-025. We use VLT/MUSE integral …
Calibration of the convective parameters in stellar pulsation hydrocodes
Szabó, Róbert; Kovács, Gábor B.; Nuspl, János
Despite the appearance of two- and three-dimensional models thanks to the rapid growth of computing performance, numerical hydrocodes used to model radial stellar pulsations (RSPs) still apply a one-dimensional stellar envelope model without any realistic atmosphere, in which a significant improvement was the inclusion of turbulent convection. How…