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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 …
A Census of the TW Hya Association with Gaia
Luhman, K. L.
I have used high-precision photometry and astrometry from the third data release of Gaia to perform a survey for members of the TW Hya association (TWA). I have identified candidate members that appear to share similar kinematics and ages with bona fide members compiled by Gagné et al. (2017), and I have assessed their membership using radial velo…
The disappearances of six supernova progenitors
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Kelly, Patrick L. +8 more
As part of a larger completed Hubble Space Telescope (HST) Snapshot program, we observed the sites of six nearby core-collapse supernovae (SNe) at high spatial resolution: SN 2012A, SN 2013ej, SN 2016gkg, SN 2017eaw, SN 2018zd, and SN 2018aoq. These observations were all conducted at sufficiently late times in each SN's evolution to demonstrate th…
Dark Matter Halo Properties of the Galactic Dwarf Satellites: Implication for Chemo-dynamical Evolution of the Satellites and a Challenge to Lambda Cold Dark Matter
Hirai, Yutaka; Hayashi, Kohei; Chiba, Masashi +1 more
Elucidating dark matter density profiles in Galactic dwarf satellites is essential to understanding not only the quintessence of dark matter, but also the evolution of the satellites themselves. In this work, we present the current constraints on dark matter densities in Galactic ultrafaint dwarf (UFD) and diffuse galaxies. Applying our constructe…