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Models and Simulations for the Photometric LSST Astronomical Time Series Classification Challenge (PLAsTiCC)
Galbany, L.; Brown, P. J.; González-Gaitán, S. +28 more
We describe the simulated data sample for the Photometric Large Synoptic Survey Telescope (LSST) Astronomical Time Series Classification Challenge (PLAsTiCC), a publicly available challenge to classify transient and variable events that will be observed by the LSST, a new facility expected to start in the early 2020s. The challenge was hosted by K…
First Identification of 10 kpc [C II] 158 µm Halos around Star-forming Galaxies at z = 5-7
Ouchi, Masami; Ivison, R. J.; Fujimoto, Seiji +7 more
We report the discovery of 10 kpc [C II] 158 µm halos surrounding star-forming galaxies in the early universe. We choose deep Atacama Large Millimeter/submillimeter Array data for 18 galaxies, each with a star formation rate of ≃10-70 M ⊙ with no signature of an active galactic nucleus whose [C II] lines are individually detected …
Precise Dynamical Masses of Directly Imaged Companions from Relative Astrometry, Radial Velocities, and Hipparcos-Gaia DR2 Accelerations
Dupuy, Trent J.; Bowler, Brendan P.; Brandt, Timothy D.
We measure dynamical masses for five objects—three ultracool dwarfs, one low-mass star, and one white dwarf—by fitting orbits to a combination of the Hipparcos-Gaia Catalog of Accelerations, literature radial velocities, and relative astrometry. Our approach provides precise masses without any assumptions about the primary star, even though the ob…
STiC: A multiatom non-LTE PRD inversion code for full-Stokes solar observations
Leenaarts, J.; Danilovic, S.; de la Cruz Rodríguez, J. +1 more
The inference of the underlying state of the plasma in the solar chromosphere remains extremely challenging because of the nonlocal character of the observed radiation and plasma conditions in this layer. Inversion methods allow us to derive a model atmosphere that can reproduce the observed spectra by undertaking several physical assumptions. The…
Tension with the flat ΛCDM model from a high-redshift Hubble diagram of supernovae, quasars, and gamma-ray bursts
Paolillo, M.; Nardini, E.; Amati, L. +4 more
In the current framework, the standard parametrization of our Universe is the so-called Lambda cold dark matter (ΛCDM) model. Recently, a ∼4σ tension with the ΛCDM model was shown to exist via a model-independent parametrization of a Hubble diagram of type Ia supernovae (SNe Ia) from the JLA survey and quasars. Model-independent approaches and ind…
Evidence for rapid disc formation and reprocessing in the X-ray bright tidal disruption event candidate AT 2018fyk
Gromadzki, M.; Hodgkin, S. T.; Kostrzewa-Rutkowska, Z. +15 more
We present optical spectroscopic and Swift UVOT/XRT observations of the X-ray and UV/optical bright tidal disruption event (TDE) candidate AT 2018fyk/ASASSN-18ul discovered by ASAS-SN. The Swift light curve is atypical for a TDE, entering a plateau after ∼40 d of decline from peak. After 80 d the UV/optical light curve breaks again to decline furt…
Constraining the Metallicities, Ages, Star Formation Histories, and Ionizing Continua of Extragalactic Massive Star Populations
Dahle, H.; Rigby, J. R.; Sharon, K. +4 more
We infer the properties of massive star populations using the far-ultraviolet stellar continua of 61 star-forming galaxies: 42 at low redshift observed with the Hubble Space Telescope and 19 at z ∼ 2 from the MEGaSaURA sample. We fit each stellar continuum with a linear combination of up to 50 single-age and single-metallicity STARBURST99 models. …
Ubiquitous cold and massive filaments in cool core clusters
Godard, B.; Fabian, A. C.; Combes, F. +19 more
Multi-phase filamentary structures around brightest cluster galaxies (BCG) are likely a key step of AGN-feedback. We observed molecular gas in three cool cluster cores, namely Centaurus, Abell S1101, and RXJ1539.5, and gathered ALMA (Atacama Large Millimeter/submillimeter Array) and MUSE (Multi Unit Spectroscopic Explorer) data for 12 other cluste…
NIHAO XV: the environmental impact of the host galaxy on galactic satellite and field dwarf galaxies
Buck, Tobias; Dutton, Aaron A.; Macciò, Andrea V. +2 more
We study the impact of the host on dwarf galaxy properties using four new Milky Way (MW)-like, ultra-high-resolution simulations (Npart > 107) from the NIHAO project. We split our sample into satellite (R < R200), nearby (1 < R/R200 < 2.5), and field (R > 2.5R200) galaxies. Simu…
Rotation Curve of the Milky Way from Classical Cepheids
Udalski, Andrzej; Mróz, Przemek; Szymański, Michał K. +7 more
Flat rotation curves of spiral galaxies are considered as an evidence for dark matter, but the rotation curve of the Milky Way is difficult to measure. Various objects were used to track the rotation curve in the outer parts of the Galaxy, but most studies rely on incomplete kinematical information and inaccurate distances. Here, we use a sample o…