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Cosmological constraints from DES Y1 cluster abundances and SPT multiwavelength data
Bacon, D.; Smith, M.; Abbott, T. M. C. +89 more
We perform a joint analysis of the counts of redMaPPer clusters selected from the Dark Energy Survey (DES) year 1 data and multiwavelength follow-up data collected within the 2500 deg2 South Pole Telescope (SPT) Sunyaev-Zel'dovich (SZ) survey. The SPT follow-up data, calibrating the richness-mass relation of the optically selected redMa…
Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample. I. A catalogue of homogeneous chromospheric activity
Recio-Blanco, A.; de Laverny, P.; Monteiro, M. J. P. F. G. +9 more
Aims: The main objective of this project is to characterise chromospheric activity of FGK stars from the HARPS archive. We start, in this first paper, by presenting a catalogue of homogeneously determined chromospheric emission (CE), stellar atmospheric parameters, and ages for 1674 FGK main sequence (MS), subgiant, and giant stars. The analy…
Evidence of a population of dark subhaloes from Gaia and Pan-STARRS observations of the GD-1 stream
Bovy, Jo; Erkal, Denis; Bertone, Gianfranco +2 more
New data from the Gaia satellite, when combined with accurate photometry from the Pan-STARRS survey, allow us to accurately estimate the properties of the GD-1 stream. Here, we analyse the stellar density variations in the GD-1 stream and show that they cannot be due to known baryonic structures such as giant molecular clouds, globular clusters, o…
Stars with Photometrically Young Gaia Luminosities Around the Solar System (SPYGLASS). I. Mapping Young Stellar Structures and Their Star Formation Histories
Rizzuto, Aaron C.; Kraus, Adam L.; Offner, Stella S. R. +1 more
Young stellar associations hold a star formation record that can persist for millions of years, revealing the progression of star formation long after the dispersal of the natal cloud. To identify nearby young stellar populations that trace this progression, we have designed a comprehensive framework for the identification of young stars and use i…
Evidence for GN-z11 as a luminous galaxy at redshift 10.957
Ho, Luis C.; Fan, Xiaohui; Jiang, Linhua +9 more
GN-z11 was photometrically selected as a luminous star-forming galaxy candidate at redshift z > 10 on the basis of Hubble Space Telescope imaging data1. Follow-up Hubble Space Telescope near-infrared grism observations detected a continuum break that was explained as the Lyα break corresponding to z =11.0 9−0.12+0.08<…
Internal calibration of Gaia BP/RP low-resolution spectra
Jordi, C.; Evans, D. W.; van Leeuwen, F. +6 more
Context. The full third Gaia data release will provide, for the first time, the calibrated spectra obtained with the blue and red Gaia slitless spectrophotometers (BP and RP, respectively). Gaia is a very complex mission and cannot be considered as a single instrument, but rather as many instruments. The two lines of sight with wide fields of view…
Detection of the LMC-induced sloshing of the Galactic halo
Bird, Sarah A.; Zhao, Gang; Erkal, Denis +8 more
A wealth of recent studies have shown that the LMC is likely massive, with a halo mass >1011 M⊙. One consequence of having such a nearby and massive neighbour is that the inner Milky Way is expected to be accelerated with respect to our Galaxy's outskirts (beyond ~30 kpc). In this work, we compile a sample of ~500 stars wi…
A High-resolution View of Fast Radio Burst Host Environments
Kilpatrick, Charles D.; Simha, Sunil; Prochaska, J. Xavier +12 more
We present Hubble Space Telescope ultraviolet and infrared observations of eight fast radio burst (FRB) host galaxies with subarcsecond localizations, including the hosts of three known repeating FRBs. We quantify their spatial distributions and locations with respect to their host galaxy light distributions, finding that they occur at moderate ho…
FINK, a new generation of broker for the LSST community
Karpov, Sergey; Savchenko, Volodymyr; Coleiro, Alexis +33 more
FINK is a broker designed to enable science with large time-domain alert streams such as the one from the upcoming Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). It exhibits traditional astronomy broker features such as automatized ingestion, annotation, selection, and redistribution of promising alerts for transient science. It…
Statistics of 700 Individually Studied W UMa Stars
Lazarević, Sanja; Latković, Olivera; Čeki, Atila
We present a statistical study of the largest bibliographic compilation of stellar and orbital parameters of W UMa stars derived by light-curve synthesis with Roche models. The compilation includes nearly 700 individually investigated objects from over 450 distinct publications. Almost 70% of this sample is comprised of stars observed in the past …