Search Publications
The Pristine dwarf galaxy survey - IV. Probing the outskirts of the dwarf galaxy Boötes I
Sestito, Federico; McConnachie, Alan W.; Navarro, Julio F. +12 more
We present a new spectroscopic study of the dwarf galaxy Boötes I (Boo I) with data from the Anglo-Australian Telescope and its AAOmega spectrograph together with the Two Degree Field multi-object system. We observed 36 high-probability Boo I stars selected using Gaia Early Data Release 3 proper motions and photometric metallicities from the Prist…
The gravitational field of X-COP galaxy clusters
Pointecouteau, E.; Eckert, D.; Ettori, S. +2 more
The mass profiles of massive dark matter halos are highly sensitive to the nature of dark matter and potential modifications of the theory of gravity on large scales. The Λ cold dark matter (CDM) paradigm makes strong predictions on the shape of dark matter halos and on the dependence of the shape parameters on halo mass, such that any deviation f…
The width of Herschel filaments varies with distance
Panopoulou, G. V.; Smith, R. J.; Ntormousi, E. +5 more
Context. Filamentary structures in nearby molecular clouds have been found to exhibit a characteristic width of 0.1 pc, as observed in dust emission. Understanding the origin of this universal width has become a topic of central importance in the study of molecular cloud structure and the early stages of star formation.
Aims: We investigate h…
Extragalactic fast X-ray transient candidates discovered by Chandra (2000-2014)
Bauer, F. E.; Brandt, W. N.; Xue, Y. Q. +7 more
Context. Extragalactic fast X-ray transients (FXRTs) are short flashes of X-ray photons of unknown origin that last a few seconds to hours.
Aims: Our ignorance about their physical mechanisms and progenitor systems is due in part to the lack of clear multiwavelength counterparts in most cases, because FXRTs have only been identified serendipi…
A systematic review and meta-analysis of Digital elevation model (DEM) fusion: pre-processing, methods and applications
Okolie, Chukwuma J.; Smit, Julian L.
The remote sensing community has identified data fusion as one of the key challenging topics of the 21st century. The subject of image fusion in two-dimensional (2D) space has been covered in several published reviews. However, the special case of 2.5D/3D Digital Elevation Model (DEM) fusion has not been addressed till date. DEM fusion is a key ap…
First Results on RR Lyrae Stars with the TESS Space Telescope: Untangling the Connections between Mode Content, Colors, and Distances
Smolec, R.; Christensen-Dalsgaard, J.; Derekas, A. +25 more
The Transiting Exoplanet Survey Satellite (TESS) space telescope is collecting continuous, high-precision optical photometry of stars throughout the sky, including thousands of RR Lyrae stars. In this paper, we present results for an initial sample of 118 nearby RR Lyrae stars observed in TESS Sectors 1 and 2. We use differential image photometry …
A Survey of CO, CO2, and H2O in Comets and Centaurs
Bauer, James; Harrington Pinto, Olga; Womack, Maria +1 more
CO and CO2 are the two dominant carbon-bearing molecules in comae and have major roles in driving activity. Their relative abundances also provide strong observational constraints to models of solar system formation and evolution but have never been studied together in a large sample of comets. We carefully compiled and analyzed publish…
Internal kinematics of Gaia eDR3 wide binaries
Hernandez, X.; Cortés, R. A. M.; Cookson, S.
Using the recent Gaia eDR3 catalogue, we construct a sample of solar neighbourhood isolated wide binaries satisfying a series of strict signal-to-noise data cuts, exclusion of random association criteria, and detailed colour-magnitude diagram selections to minimize the presence of any kinematic contaminating effects having been discussed in the li…
Particles and Photons as Drivers for Particle Release from the Surfaces of the Moon and Mercury
Wurz, P.; Lammer, H.; Galli, A. +13 more
The Moon and Mercury are airless bodies, thus they are directly exposed to the ambient plasma (ions and electrons), to photons mostly from the Sun from infrared range all the way to X-rays, and to meteoroid fluxes. Direct exposure to these exogenic sources has important consequences for the formation and evolution of planetary surfaces, including …
High D/H ratios in water and alkanes in comet 67P/Churyumov-Gerasimenko measured with Rosetta/ROSINA DFMS
Altwegg, K.; Berthelier, J. J.; Fuselier, S. A. +8 more
Context. Isotopic abundances in comets are key to understanding and reconstructing the history and origin of material in the Solar System. Data for deuterium-to-hydrogen (D/H) ratios in water are available for several comets. However, no long-term studies of the D/H ratio in water of a comet during its passage around the Sun have been reported thu…