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Identifying RR Lyrae Variable Stars in Six Years of the Dark Energy Survey
Bacon, D.; Bechtol, K.; Smith, M. +67 more
We present a search for RR Lyrae stars using the full six-year data set from the Dark Energy Survey covering ∼5000 deg2 of the southern sky. Using a multistage multivariate classification and light-curve template-fitting scheme, we identify RR Lyrae candidates with a median of 35 observations per candidate. We detect 6971 RR Lyrae candi…
White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 16
Kepler, S. O.; Pelisoli, Ingrid; Romero, Alejandra D. +2 more
White dwarfs are the end state of the evolution of more than 97 per cent of all stars, and therefore carry information on the structure and evolution of the Galaxy through their luminosity function and initial-to-final mass relation. Examining the new spectra of all white or blue stars in the Sloan Digital Sky Survey Data Release 16, we report the…
The pristine dwarf-galaxy survey - III. Revealing the nature of the Milky Way globular cluster Sagittarius II
McConnachie, Alan W.; Navarro, Julio F.; Martin, Nicolas +13 more
We present a new spectroscopic study of the faint Milky Way satellite Sagittarius II. Using multiobject spectroscopy from the Fibre Large Array Multi-Element Spectrograph, we supplement the data set of Longeard et al. with 47 newly observed stars, 19 of which are identified as members of the satellite. These additional member stars are used to put…
Modelling a multi-spacecraft coronal mass ejection encounter with EUHFORIA
Palmerio, E.; Temmer, M.; Poedts, S. +6 more
Context. Coronal mass ejections (CMEs) are a manifestation of the Sun's eruptive nature. They can have a great impact on Earth, but also on human activity in space and on the ground. Therefore, modelling their evolution as they propagate through interplanetary space is essential.
Aims: EUropean Heliospheric FORecasting Information Asset (EUHF…
Shock Induced Strong Substorms and Super Substorms: Preconditions and Associated Oxygen Ion Dynamics
Zong, Q. -G.; Fu, S. -Y.; Yue, C.
It is well known that the interaction between interplanetary (IP) shocks and the Earth's magnetosphere would generate/excite various types of geomagnetic phenomena. Progresses have been made on the Earth's magnetospheric response to solar wind forcing in recent years in the aspects associated with magnetospheric substorms. Strong substorms and sup…
Connecting X-ray nuclear winds with galaxy-scale ionised outflows in two z ∼ 1.5 lensed quasars
Marconi, A.; Vignali, C.; Comastri, A. +15 more
Aims: Outflows driven by active galactic nuclei (AGN) are expected to have a significant impact on host galaxy evolution, but the matter of how they are accelerated and propagated on galaxy-wide scales is still under debate. This work addresses these questions by studying the link between X-ray, nuclear ultra-fast outflows (UFOs), and extende…
Tracing the evolution of dust-obscured activity using sub-millimetre galaxy populations from STUDIES and AS2UDS
Scott, D.; Shirley, R.; Smail, Ian +16 more
We analyse the physical properties of 121 SNR ≥ 5 sub-millimetre galaxies (SMGs) from the STUDIES 450 µm survey. We model their UV-to-radio spectral energy distributions using MAGPHYS+photo-z and compare the results to similar modelling of 850 µm-selected SMG sample from AS2UDS, to understand the fundamental physical differences betwee…
Overdensities of submillimetre-bright sources around candidate protocluster cores selected from the South Pole Telescope survey
Greve, Thomas R.; Phadke, Kedar A.; Aravena, Manuel +21 more
We present APEX-LABOCA 870-µm observations of the fields surrounding the nine brightest high-redshift unlensed objects discovered in the South Pole Telescope's (SPT) 2500 deg2 survey. Initially seen as point sources by SPT's 1-arcmin beam, the 19-arcsec resolution of our new data enables us to deblend these objects and search for …
Abundances of neutron-capture elements in thin- and thick-disc stars in the solar neighbourhood
Tautvaišienė, G.; Drazdauskas, A.; Mikolaitis, Š. +4 more
Aims: The aim of this work is to determine abundances of neutron-capture elements for thin- and thick-disc F, G, and K stars in several selected sky fields near the north ecliptic pole and to compare the results with the Galactic chemical evolution models, to explore elemental gradients according to stellar ages, mean galactocentric distances…
The Astrophysical Distance Scale. III. Distance to the Local Group Galaxy WLM Using Multiwavelength Observations of the Tip of the Red Giant Branch, Cepheids, and JAGB Stars
Madore, Barry F.; Freedman, Wendy L.; Lee, Abigail J. +3 more
The local determination of the Hubble constant sits at a crossroad. Current estimates of the local expansion rate of the universe differ by about 1.7σ, derived from the Cepheid- and TRGB-based calibrations, applied to Type Ia supernovae. To help elucidate possible sources of systematic error causing the tension, we show in this study the recently …