Search Publications
Massive star cluster formation and evolution in tidal dwarf galaxies
Weilbacher, Peter M.; Boquien, Médéric; de Grijs, Richard +8 more
Context. The formation of globular clusters remains an open debate. Dwarf starburst galaxies are efficient at forming young massive clusters with similar masses as globular clusters and may hold the key to understanding their formation.
Aims: We study star cluster formation in a tidal debris, including the vicinity of three tidal dwarf galaxi…
Hypotheses for the origin of the Hypanis fan-shaped deposit at the edge of the Chryse escarpment, Mars: Is it a delta?
Sefton-Nash, Elliot; Bell, James F., III; Adler, Jacob B. +4 more
We investigated the origin of the fan-shaped deposit at the end of Hypanis Valles that has previously been proposed as an ExoMars, Mars 2020, and human mission candidate landing site, and found evidence that the landform is an ancient delta. Previous work suggests that the deposit originated from a time of fluvial activity both distinct from and p…
The Detection of [O III] λ4363 in a Lensed, Dwarf Galaxy at z = 2.59: Testing Metallicity Indicators and Scaling Relations at High Redshift and Low Mass
Richard, Johan; Siana, Brian; Freeman, William R. +6 more
We present Keck/MOSFIRE (Multi-Object Spectrometer for InfraRed Exploration) and Keck/LRIS (Low Resolution Imaging Spectrometer) spectroscopy of A1689-217, a lensed (magnification ∼7.9), star-forming (SFR ∼ 16 M ⊙ yr-1), dwarf (log(M */M ⊙) = 8.07-8.59) Lyα emitter (EW0 ∼ 138 Å) at z = 2.5918.…
The solar chromosphere at millimetre and ultraviolet wavelengths. I. Radiation temperatures and a detailed comparison
De Pontieu, B.; Rezaei, R.; Carlsson, M. +3 more
Solar observations with the Atacama Large Millimeter/submillimeter Array (ALMA) provide us with direct measurements of the brightness temperature in the solar chromosphere. We study the temperature distributions obtained with ALMA Band 6 (in four sub-bands at 1.21, 1.22, 1.29, and 1.3 mm) for various areas at, and in the vicinity of, a sunspot, co…
Simulations of Ice Chemistry in Cometary Nuclei
Garrod, Robin T.
The first computational model of solid-phase chemistry in cometary nuclear ices is presented. An astrochemical kinetics model, the Model for Astrophysical Gas and Ice Chemical Kinetics And Layering, is adapted to trace the chemical evolution in multiple layers of cometary ice, over a representative period of 5 Gyr. Physical conditions are chosen a…
The COS Absorption Survey of Baryon Harbors: The Galaxy Database and Cross-correlation Analysis of O VI Systems
Tripp, Todd M.; Prochaska, J. Xavier; Tejos, Nicolas +10 more
We describe the survey for galaxies in the fields surrounding nine sightlines to far-UV bright, z ∼ 1 quasars that define the COS Absorption Survey of Baryon Harbors (CASBaH) program. The photometry and spectroscopy that comprise the data set come from a mixture of public surveys (SDSS, DECaLS) and our dedicated efforts on private facilities (Keck…
From kpcs to the central parsec of NGC 1097: feeding star formation and a black hole at the same time
Bruzual, Gustavo; Burkert, Andreas; Prieto, M. Almudena +3 more
A panchromatic view of the star-forming ring and feeding process in the central kpc of the galaxy NGC 1097 is presented. The assembled IR to UV images at ∼10 pc resolution allow us to characterize the population of circa 250 clusters in the ring and disentangle the network of filaments of dust and gas that enshroud and feed them. The ring is a pla…
LISA Pathfinder micronewton cold gas thrusters: In-flight characterization
Mendes, L.; Russano, G.; Lloro, I. +76 more
The LISA Pathfinder (LPF) mission has demonstrated the ability to limit and measure the fluctuations in acceleration between two free falling test masses down to sub-femto-g levels. One of the key elements to achieve such a level of residual acceleration is the drag free control. In this scheme the spacecraft is used as a shield against any extern…
Three-dimensional dust mapping of 12 supernovae remnants in the Galactic anticentre
Zijlstra, A.; Jiang, B. W.; Chen, B. Q. +1 more
We present three-dimensional (3D) dust mapping of 12 supernova remnants (SNRs) in the Galactic anticentre (Galactic longitude l between 150° and 210°) based on a recent 3D interstellar extinction map. The dust distribution of the regions, which cover the full extents in the radio continuum for the individual SNRs, is discussed. Four SNRs show sign…
An estimate of the k2 Love number of WASP-18Ab from its radial velocity measurements
Csizmadia, Sz.; Smith, A. M. S.; Hellard, H.
Context. Increasing our knowledge of the interior structure, composition, and density distribution of exoplanets is crucial to make progress in the understanding of exoplanetary formation, migration and habitability. However, the directly measurable mass and radius values offer little constraint on interior structure, because the inverse problem i…