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The Automatic Learning for the Rapid Classification of Events (ALeRCE) Alert Broker
Bauer, F. E.; Moya, A.; Catelan, M. +40 more
We introduce the Automatic Learning for the Rapid Classification of Events (ALeRCE) broker, an astronomical alert broker designed to provide a rapid and self-consistent classification of large etendue telescope alert streams, such as that provided by the Zwicky Transient Facility (ZTF) and, in the future, the Vera C. Rubin Observatory Legacy Surve…
Evidence from APOGEE for the presence of a major building block of the halo buried in the inner Galaxy
Cunha, Katia; Smith, Verne V.; Majewski, Steven R. +13 more
We report evidence from APOGEE for the presence of a new metal-poor stellar structure located within ∼4 kpc of the Galactic Centre. Characterized by a chemical composition resembling those of low-mass satellites of the Milky Way, this new inner Galaxy structure (IGS) seems to be chemically and dynamically detached from more metal-rich populations …
Dark energy survey year 3 results: weak lensing shape catalogue
Bacon, D.; Smith, M.; Davis, T. M. +101 more
We present and characterize the galaxy shape catalogue from the first 3 yr of Dark Energy Survey (DES) observations, over an effective area of 4143 deg2 of the southern sky. We describe our data analysis process and our self-calibrating shear measurement pipeline METACALIBRATION, which builds and improves upon the pipeline used in the D…
Repeating behaviour of FRB 121102: periodicity, waiting times, and energy distribution
Kramer, M.; Seymour, A.; Scholz, P. +7 more
Detections from the repeating fast radio burst FRB 121102 are clustered in time, noticeable even in the earliest repeat bursts. Recently, it was argued that the source activity is periodic, suggesting that the clustering reflected a not-yet-identified periodicity. We performed an extensive multiwavelength campaign with the Effelsberg telescope, th…
Age dissection of the Milky Way discs: Red giants in the Kepler field
Khan, S.; Valentini, M.; Chiappini, C. +16 more
Ensemble studies of red-giant stars with exquisite asteroseismic (Kepler), spectroscopic (APOGEE), and astrometric (Gaia) constraints offer a novel opportunity to recast and address long-standing questions concerning the evolution of stars and of the Galaxy. Here, we infer masses and ages for nearly 5400 giants with available Kepler light curves a…
X-ray quasi-periodic eruptions from two previously quiescent galaxies
Gromadzki, M.; Salvato, M.; Buchner, J. +21 more
Quasi-periodic eruptions (QPEs) are very-high-amplitude bursts of X-ray radiation recurring every few hours and originating near the central supermassive black holes of galactic nuclei1,2. It is currently unknown what triggers these events, how long they last and how they are connected to the physical properties of the inner accretion f…
Distances to PHANGS galaxies: New tip of the red giant branch measurements and adopted distances
Van Dyk, Schuyler D.; Kruijssen, J. M. Diederik; Leroy, Adam K. +29 more
PHANGS-HST is an ultraviolet-optical imaging survey of 38 spiral galaxies within ~20 Mpc. Combined with the PHANGS-ALMA, PHANGS-MUSE surveys and other multiwavelength data, the data set will provide an unprecedented look into the connections between young stars, H II regions, and cold molecular gas in these nearby star-forming galaxies. Accurate d…
The [O III]+H β equivalent width distribution at z ≃ 7: implications for the contribution of galaxies to reionization
Charlot, Stéphane; Chevallard, Jacopo; Stark, Daniel P. +1 more
We quantify the distribution of [O III]+H β line strengths at z ≃ 7 using a sample of 20 bright ( $\mathrm{M}_{\mathrm{UV}}^{}$ ≲ -21) galaxies. We select these systems over wide-area fields (2.3 deg2 total) using a new colour-selection that precisely selects galaxies at z ≃ 6.63-6.83, a redshift range where blue Spitzer/IRAC [3.6]-[4.5…
A buyer's guide to the Hubble constant
Lahav, Ofer; Lemos, Pablo; Shah, Paul
Since the expansion of the universe was first established by Edwin Hubble and Georges Lemaître about a century ago, the Hubble constant H0 which measures its rate has been of great interest to astronomers. Besides being interesting in its own right, few properties of the universe can be deduced without it. In the last decade, a signific…
The Evolution of the IR Luminosity Function and Dust-obscured Star Formation over the Past 13 Billion Years
Kartaltepe, J. S.; Yun, M. S.; Clements, D. L. +25 more
We present the first results from the Mapping Obscuration to Reionization with ALMA (MORA) survey, the largest Atacama Large Millimeter/submillimeter Array (ALMA) blank-field contiguous survey to date (184 arcmin2) and the only at 2 mm to search for dusty star-forming galaxies (DSFGs). We use the 13 sources detected above 5σ to estimate…