Search Publications
Gaia Data Release 3. Stellar chromospheric activity and mass accretion from Ca II IRT observed by the Radial Velocity Spectrometer
Hatzidimitriou, D.; Marshall, D. J.; Andretta, V. +82 more
Context. The Gaia Radial Velocity Spectrometer (RVS) provides the unique opportunity of a spectroscopic analysis of millions of stars at medium resolution (λ/Δλ ∼ 11 500) in the near-infrared (845−872 nm). This wavelength range includes the Ca II infrared triplet (IRT) at 850.03, 854.44, and 866.45 nm, which is a good indicator of magnetic activit…
A shared accretion instability for black holes and neutron stars
Altamirano, D.; Belloni, T.; Degenaar, N. +20 more
Accretion disks around compact objects are expected to enter an unstable phase at high luminosity1. One instability may occur when the radiation pressure generated by accretion modifies the disk viscosity, resulting in the cyclic depletion and refilling of the inner disk on short timescales2. Such a scenario, however, has onl…
ODIN: Where Do Lyα Blobs Live? Contextualizing Blob Environments within Large-scale Structure
Dey, Arjun; Gronwall, Caryl; Jeong, Woong-Seob +16 more
While many Lyα blobs (LABs) are found in and around several well-known protoclusters at high redshift, how they trace the underlying large-scale structure is still poorly understood. In this work, we utilize 5352 Lyα emitters (LAEs) and 129 LABs at z = 3.1 identified over a ~9.5 deg2 area in early data from the ongoing One-hundred-deg
RASS-MCMF: a full-sky X-ray selected galaxy cluster catalogue
Klein, Matthias; Hernández-Lang, Daniel; Mohr, Joseph J. +2 more
We present the RASS-MCMF catalogue of 8449 X-ray selected galaxy clusters over 25 000 deg2 of extragalactic sky. The accumulation of deep multiband optical imaging data, the development of the Multi-Component Matched Filter (MCMF) cluster confirmation algorithm, and the release of the DESI Legacy Survey DR10 catalogue makes it possible …
Production of 44Ti and Iron-group Nuclei in the Ejecta of 3D Neutrino-driven Supernovae
Sieverding, Andre; Kresse, Daniel; Janka, Hans-Thomas
The radioactive isotopes 44Ti and 56Ni are important products of explosive nucleosynthesis, which play a key role in supernova (SN) diagnostics and have been detected in several nearby young SN remnants. However, most SN models based on nonrotating single stars predict yields of 44Ti that are much lower than the va…
Systematic KMTNet Planetary Anomaly Search. VII. Complete Sample of q < 10-4 Planets from the First 4 yr Survey
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +39 more
We present the analysis of seven microlensing planetary events with planet/host mass ratios q < 10-4: KMT-2017-BLG-1194, KMT-2017-BLG-0428, KMT-2019-BLG-1806, KMT-2017-BLG-1003, KMT-2019-BLG-1367, OGLE-2017-BLG-1806, and KMT-2016-BLG-1105. They were identified by applying the Korea Microlensing Telescope Network (KMTNet) AnomalyFinde…
The Relationship between Age, Metallicity, and Abundances for Disk Stars in a Simulated Milky Way
Ness, Melissa K.; Hawkins, Keith; Wetzel, Andrew +4 more
Observations of the Milky Way's low-α disk show that several element abundances correlate with age at fixed metallicity, with unique slopes and small scatters around the age-[X/Fe] relations. In this study, we turn to simulations to explore the age-[X/Fe] relations for the elements C, N, O, Mg, Si, S, and Ca that are traced in a FIRE-2 cosmologica…
An evolutionary continuum from nucleated dwarf galaxies to star clusters
Zhang, Hongxin; Liu, Chengze; Cuillandre, Jean-Charles +21 more
Systematic studies1-4 have revealed hundreds of ultra-compact dwarf galaxies (UCDs5) in the nearby Universe. With half-light radii rh of approximately 10-100 parsecs and stellar masses M* ≈ 106-108 solar masses, UCDs are among the densest known stellar systems6. Although …
oMEGACat. I. MUSE Spectroscopy of 300,000 Stars within the Half-light Radius of ω Centauri
Dreizler, S.; Milone, A. P.; Latour, M. +17 more
Omega Centauri (ω Cen) is the most massive globular cluster of the Milky Way and has been the focus of many studies that reveal the complexity of its stellar populations and kinematics. However, most previous studies have used photometric and spectroscopic data sets with limited spatial or magnitude coverage, while we aim to investigate it having …
Substructures in Compact Disks of the Taurus Star-forming Region
Zhang, Ke; Bergin, Edwin A.; Long, Feng +5 more
Observations of substructure in protoplanetary disks have largely been limited to the brightest and largest disks, excluding the abundant population of compact disks, which are likely sites of planet formation. Here, we reanalyze ~0.″1, 1.33 mm Atacama Large Millimeter/submillimeter Array (ALMA) continuum observations of 12 compact protoplanetary …