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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…
The accretion of a solar mass per day by a 17-billion solar mass black hole
Wolf, Christian; Lai, Samuel; Bian, Fuyan +5 more
Around a million quasars have been catalogued in the Universe by probing deeper and using new methods for discovery. However, the hardest ones to find seem to be the rarest and brightest specimens. Here we study the properties of the most luminous of all quasars found so far. These have been overlooked until recently, which demonstrates that moder…
The multi-spacecraft high-energy solar particle event of 28 October 2021
Vainio, R.; Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F. +15 more
Aims: We studied the first multi-spacecraft high-energy solar energetic particle (SEP) event of solar cycle 25, which triggered a ground level enhancement on 28 October 2021, using data from multiple observers (Parker Solar Probe, STEREO-A, Solar Orbiter, GOES, SOHO, BepiColombo, and the Mars Science Laboratory) that were widely distributed t…
Low-redshift Lyman Continuum Survey (LzLCS). Radio continuum properties of low-z Lyman continuum emitters
Pentericci, Laura; Jaskot, Anne E.; Flury, Sophia R. +20 more
Context. Sources that leak Lyman continuum (LyC) photons and lead to the reionisation of the universe are an object of intense study using multiple observing facilities. Recently, the Low-redshift LyC Survey (LzLCS) has presented the first large sample of LyC emitting galaxies at low redshift (z ∼ 0.3) with the Hubble Space Telescope Cosmic Origin…
Using rest-frame optical and NIR data from the RAISIN survey to explore the redshift evolution of dust laws in SN Ia host galaxies
Jones, David O.; Challis, Peter M.; Kirshner, Robert P. +2 more
We use rest-frame optical and near-infrared (NIR) observations of 42 Type Ia supernovae (SNe Ia) from the Carnegie Supernova Project at low-z and 37 from the RAISIN (SNIA in the IR) Survey at high-z to investigate correlations between SN Ia host galaxy dust, host mass, and redshift. This is the first time the SN Ia host galaxy dust extinction law …
MIGHTEE: Multi-wavelength counterparts in the COSMOS field
Bowler, R. A. A.; Marchetti, L.; Vaccari, M. +26 more
In this paper, we combine the Early Science radio continuum data from the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) Survey, with optical and near-infrared data and release the cross-matched catalogues. The radio data used in this work covers 0.86 deg2 of the COSMOS field, reaches a thermal noise of 1.7 µ…
A joint SRG/eROSITA + ZTF search: Discovery of a 97-min period eclipsing cataclysmic variable with evidence of a brown dwarf secondary
Riddle, Reed; Szkody, Paula; El-Badry, Kareem +24 more
Cataclysmic variables (CVs) that have evolved past the period minimum during their lifetimes are predicted to be systems with a brown dwarf donor. While population synthesis models predict that around 40-70 per cent of the Galactic CVs are post-period minimum systems referred to as 'period bouncers', only a few dozen confirmed systems are known. W…
Mass estimates from optical modelling of the new TRAPUM redback PSR J1910-5320
Dhillon, V. S.; Ferrara, E. C.; Kramer, M. +17 more
Spider pulsars continue to provide promising candidates for neutron star mass measurements. Here we present the discovery of PSR J1910-5320, a new millisecond pulsar discovered in a MeerKAT observation of an unidentified Fermi-LAT gamma-ray source. This pulsar is coincident with a recently identified candidate redback binary, independently discove…