Search Publications
The relation between Lyα absorbers and local galaxy filaments
Richter, P.; Wendt, M.; Bouma, S. J. D.
Context. The intergalactic medium (IGM) is believed to contain the majority of baryons in the universe and to trace the same dark matter structure as galaxies, forming filaments and sheets. Lyα absorbers, which sample the neutral component of the IGM, have been extensively studied at low and high redshift, but the exact relation between Lyα absorp…
Linking ice and gas in the λ Orionis Barnard 35A cloud
Pontoppidan, K. M.; Rocha, W. R. M.; Bjerkeli, P. +5 more
Context. Dust grains play an important role in the synthesis of molecules in the interstellar medium, from the simplest species, such as H2, to complex organic molecules. How some of these solid-state molecules are converted into gas-phase species is still a matter of debate.
Aims: Our aim is to directly compare ice and gas abundan…
Using heritability of stellar chemistry to reveal the history of the Milky Way
Jofré, Paula; de Brito Silva, Danielle; Das, Payel +3 more
Since chemical abundances are inherited between generations of stars, we use them to trace the evolutionary history of our Galaxy. We present a robust methodology for creating a phylogenetic tree, a biological tool used for centuries to study heritability. Combining our phylogeny with information on stellar ages and dynamical properties, we recons…
Improved Atomic Transition Probabilities for UV and Optical Lines of Hf II and Determination of the Hf Abundance in Two Metal-poor Stars
Roederer, I. U.; Lawler, J. E.; Den Hartog, E. A.
We report new branching fraction measurements for 199 UV and optical transitions of Hf II. These transitions range in wavelength (wavenumber) from 2068 to 6584 Å (48,322-15,183 cm-1) and originate in 17 odd-parity upper levels ranging in energy from 38,578 to 53,227 cm-1. The branching fractions are combined with radiative li…
New-generation dust emission templates for star-forming galaxies
Boquien, Médéric; Salim, Samir
Context. The infrared (IR) emission of dust heated by stars provides critical information for galaxy evolution studies. Unfortunately, observations are often limited to the mid-IR, making templates a necessity. Previously published templates were based on small samples of luminous galaxies, which are not necessarily representative of normal star-f…
An updated distance to the Cygnus Loop based on Gaia Early DR3
Blair, William P.; Raymond, John C.; Fesen, Robert A. +2 more
We present a revised distance to the Cygnus Loop supernova remnant of 725 ± 15 pc based on Gaia Early Data Release 3 parallax measurements (EDR3) for several stars previously found to be located either inside or behind the supernova based on the presence of high-velocity absorption lines in their spectra. This revised distance estimate and error m…
Bow shocks, nova shells, disc winds and tilted discs: the nova-like V341 Ara has it all
Altamirano, D.; Knigge, C.; James, D. J. +21 more
V341 Ara was recently recognized as one of the closest (d ≃ 150 pc) and brightest (V ≃ 10) nova-like cataclysmic variables. This unique system is surrounded by a bright emission nebula, likely to be the remnant of a recent nova eruption. Embedded within this nebula is a prominent bow shock, where the system's accretion disc wind runs into its own …
In-flight testing of the injection of the LISA Pathfinder test mass into a geodesic
Mendes, L.; Russano, G.; Nofrarias, M. +77 more
LISA Pathfinder is a technology demonstrator space mission, aimed at testing key technologies for detecting gravitational waves in space. The mission is the precursor of LISA, the first space gravitational waves observatory, whose launch is scheduled for 2034. The LISA Pathfinder scientific payload includes two gravitational reference sensors (GRS…
The Northward IMF Magnetosphere
Fear, Robert C.
Linking globular cluster structural parameters and their evolution: multiple stellar populations
Mastrobuono-Battisti, Alessandra; Perets, Hagai B.
Globular clusters (GCs) are known to host multiple stellar populations showing chemical anomalies in the content of light elements. The origin of such anomalies observed in Galactic GCs is still debated. Here we analyse data compiled from the Hubble Space Telescope, ground-based surveys, and Gaia Data Release 2 (DR2) and explore relationships betw…