Search Publications
The structural properties of multiple populations in globular clusters: The instructive case of NGC 3201
Vesperini, Enrico; Cadelano, Mario; Dalessandro, Emanuele
All multiple population (MP) formation models in globular clusters (GCs) predict that second population (SP) stars form more centrally concentrated than the first population (FP). As dynamical evolution proceeds, spatial differences are progressively erased and only dynamically young clusters are expected to retain a partial memory of the initial …
X-Ray Bright Active Galactic Nuclei in Local Dwarf Galaxies: Insights from eROSITA
Sacchi, Andrea; Bogdán, Ákos; Chadayammuri, Urmila +1 more
Although supermassive black holes (SMBHs) reside in the heart of virtually every massive galaxy, it remains debated whether dwarf galaxies commonly host SMBHs. Because low-mass galaxies may retain memory of the assembly history of their black holes (BHs), probing the BH occupation fraction of local dwarf galaxies might offer insights into the grow…
Riding the dark matter wave: Novel limits on general dark photons from LISA Pathfinder
Jaeckel, Joerg; Frerick, Jonas; Kahlhoefer, Felix +1 more
We note the possibility to perform a parametrically improved search for gauged baryon (B) and baryon minus lepton (
TOI-1685 b Is a Hot Rocky Super-Earth: Updates to the Stellar and Planet Parameters of a Popular JWST Cycle 2 Target
Gaidos, Eric; Kasper, David; Luque, Rafael +12 more
We present an updated characterization of the TOI-1685 planetary system, which consists of a P b = 0.69 day ultra-short-period super-Earth planet orbiting a nearby (d = 37.6 pc) M2.5V star (TIC 28900646, 2MASS J04342248+4302148). This planet was previously featured in two contemporaneous discovery papers, but the best-fit planet mass, r…
The MEGARA view of outflows in LINERs
Hermosa Muñoz, L.; Márquez, I.; Masegosa, J. +12 more
Context. Feedback processes, in particular those driven by outflows, are believed to play a major role in galaxy evolution. Outflows are believed to be ubiquitous in all active galactic nuclei (AGNs), although their presence in low luminosity AGNs, in particular for Low-Ionisation Nuclear Emission line Regions (LINERs), has only started to be expl…
Eclipse-timing study of new hierarchical triple star candidates in the northern continuous viewing zone of TESS
Mitnyan, T.; Pál, A.; Borkovits, T. +4 more
Aims: We compiled a list of more than 3500 eclipsing binaries located in and near the northern continuous viewing zone (NCVZ) of the TESS space telescope that have sufficient TESS photometry to search for additional hidden components in these systems. In addition to discovering their hierarchical nature, we also determined their orbital param…
X-Ray Diagnostics of Cassiopeia A's "Green Monster": Evidence for Dense Shocked Circumstellar Plasma
Temim, Tea; De Looze, Ilse; Slane, Patrick +4 more
The recent survey of the core-collapse supernova remnant Cassiopeia A (Cas A) with the MIRI instrument on board the James Webb Space Telescope (JWST) revealed a large structure in the interior region, referred to as the "Green Monster." Although its location suggests that it is an ejecta structure, the infrared properties of the "Green Monster" hi…
LMC-driven Anisotropic Boosts in Stream–Subhalo Interactions
Wetzel, Andrew; Cunningham, Emily C.; Sanderson, Robyn E. +4 more
Dark matter subhalos are predicted to perturb stellar streams; stream morphologies and dynamics can, therefore, constrain the mass distribution of subhalos. Using FIRE-2 simulations of Milky Way–mass galaxies, we demonstrate that the presence of an LMC analog significantly changes stream–subhalo encounter rates. The LMC analog brings in many subha…
Multiple populations and a CH star found in the 300S globular cluster stellar stream
Lewis, Geraint F.; Belokurov, Vasily; Bland-Hawthorn, Joss +15 more
Milky Way globular clusters (GCs) display chemical enrichment in a phenomenon called multiple stellar populations (MSPs). While the enrichment mechanism is not fully understood, there is a correlation between a cluster's mass and the fraction of enriched stars found therein. However, present-day GC masses are often smaller than their masses at the…
Astrometric weak lensing with Gaia DR3 and future catalogues: searches for dark matter substructure
Van Tilburg, Ken; Weiner, Neal; Taki, Anna-Maria +2 more
Small-scale dark matter structures lighter than a billion solar masses are an important probe of primordial density fluctuations and dark matter microphysics. Due to their lack of starlight emission, their only guaranteed signatures are gravitational in nature. We report on results of a search for astrometric weak lensing by compact dark matter su…