Search Publications
PEARLS: NuSTAR and XMM-Newton Extragalactic Survey of the JWST North Ecliptic Pole Time-domain Field II
Koekemoer, Anton M.; Yan, Haojing; Willmer, Christopher N. A. +30 more
We present the second NuSTAR and XMM-Newton extragalactic survey of the JWST north ecliptic pole (NEP) time-domain field (TDF). The first NuSTAR NEP-TDF survey had 681 ks total exposure time executed in NuSTAR cycle 5 in 2019 and 2020. This second survey, acquired from 2020 to 2022 in cycle 6, adds 880 ks of NuSTAR exposure time. The overall NuSTA…
Limits on Planetary-mass Primordial Black Holes from the OGLE High-cadence Survey of the Magellanic Clouds
Udalski, Andrzej; Mróz, Przemek; Szymański, Michał K. +11 more
Observations of the Galactic bulge revealed an excess of short-timescale gravitational microlensing events that are generally attributed to a large population of free-floating or wide-orbit exoplanets. However, in recent years, some authors suggested that planetary-mass primordial black holes (PBHs) comprising a substantial fraction (1%–10%) of th…
ALMA-IMF. XII. Point-process mapping of 15 massive protoclusters
Galván-Madrid, R.; Cunningham, N.; Csengeri, T. +29 more
Context. A crucial aspect in addressing the challenge of measuring the core mass function (CMF), that is pivotal for comprehending the origin of the initial mass function (IMF), lies in constraining the temperatures of the cores.
Aims: We aim to measure the luminosity, mass, column density and dust temperature of star-forming regions imaged b…
Rotation plays a role in the generation of magnetic fields in single white dwarfs
Bell, Keaton J.; Parsons, Steven G.; Landstreet, John D. +5 more
Recent surveys of close white dwarf binaries as well as single white dwarfs have provided evidence for the late appearance of magnetic fields in white dwarfs, and a possible generation mechanism, a crystallization and rotation-driven dynamo has been suggested. A key prediction of this dynamo is that magnetic white dwarfs rotate, at least on averag…
The PIPER survey. II. The globular cluster systems of low surface brightness galaxies in the Perseus cluster
Forbes, Duncan A.; Romanowsky, Aaron J.; Brodie, Jean P. +7 more
We present Hubble Space Telescope ACS/WFC and WFC3/UVIS imaging for a sample of 50 low-surface brightness (LSB) galaxies in the
DAVOS: Dwarf Active Galactic Nuclei from Variability for the Origins of Seeds: Properties of Variability-selected Active Galactic Nuclei in the COSMOS Field and Expectations for the Rubin Observatory
Greene, Jenny E.; Natarajan, Priyamvada; Liu, Xin +3 more
We study the black hole mass–host galaxy stellar mass relation, M BH–M *, of a sample of z < 4 optically variable active galactic nuclei (AGNs) in the COSMOS field. The parent sample of 491 COSMOS AGNs were identified by optical variability from the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) program. Using public…
Re-energization of AGN head-tail radio galaxies in the galaxy cluster ZwCl 0634.1+47474
Di Gennaro, G.; Brunetti, G.; Shimwell, T. W. +10 more
Low-frequency radio observations show an increasing number of radio galaxies located in galaxy clusters that display peculiar morphologies and spectral profiles. This is the result of the dynamical interaction of the galaxy with the surrounding medium. Studying this phenomenon is key to understanding the evolution of low-energy relativistic partic…
Observation of Alfvén Wave Reflection in the Solar Chromosphere: Ponderomotive Force and First Ionization Potential Effect
Stangalini, Marco; Long, David M.; Brooks, David H. +7 more
We investigate the propagation of Alfvén waves in the solar chromosphere, distinguishing between upward and downward propagating waves. We find clear evidence for the reflection of waves in the chromosphere and differences in propagation between cases with waves interpreted to be resonant or nonresonant with the overlying coronal structures. This …
The accretion burst of the massive young stellar object G323.46−0.08
Matter, A.; Eislöffel, J.; Stecklum, B. +10 more
Context. Accretion bursts from low-mass young stellar objects (YSOs) have been known for many decades. In recent years, the first accretion bursts of massive YSOs (MYSOs) have been observed. These phases of intense protostellar growth are of particular importance for studying massive star formation. Bursts of MYSOs are accompanied by flares of Cla…
Astrometric search for ultralight dark matter
Kim, Hyungjin
Precision astrometry offers a way to probe new physics. By measuring the angular position of light sources at unprecedented precision, astrometry could probe minuscule fluctuations of underlying spacetime. This work explores the possibility of probing ultralight dark matter candidates using precision astrometry. Through the coherent and stochastic…