Search Publications
Inner dark matter distribution of the Cosmic Horseshoe (J1148+1930) with gravitational lensing and dynamics
Lewis, G. F.; Halkola, A.; Suyu, S. H. +4 more
We present a detailed analysis of the inner mass structure of the Cosmic Horseshoe (J1148+1930) strong gravitational lens system observed with the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3). In addition to the spectacular Einstein ring, this systems shows a radial arc. We obtained the redshift of the radial arc counterimage zs, r…
Heliospheric modulation of the interstellar dust flow on to Earth
Krüger, H.; Srama, R.; Grün, E. +3 more
Aims: Based on measurements by the Ulysses spacecraft and high-resolution modelling of the motion of interstellar dust (ISD) through the heliosphere we predict the ISD flow in the inner planetary system and on to the Earth. This is the third paper in a series of three about the flow and filtering of the ISD.
Methods: Micrometer- and sub-…
Exploring the Outskirts of Globular Clusters: The Peculiar Kinematics of NGC 3201
Famaey, B.; Ibata, R.; Bianchini, P.
The outskirts of globular clusters (GCs) simultaneously retain crucial information about their formation mechanism and the properties of their host galaxy. Thanks to the advent of precision astrometry both their morphological and kinematic properties are now accessible. Here we present the first dynamical study of the outskirts of the retrograde G…
Late-time Kilonova Light Curves and Implications to GW170817
Waxman, Eli; Ofek, Eran O.; Kushnir, Doron
We discuss the late-time (tens of days) emission from the radioactive ejecta of mergers involving neutron stars, when the ionization energy loss time of beta-decay electrons and positrons exceeds the expansion time. We show that if the e± are confined to the plasma (by magnetic fields), then the time dependence of the plasma heating rat…
Col-OSSOS: Color and Inclination Are Correlated throughout the Kuiper Belt
Wang, Shiang-Yu; Marsset, Michaël; Fraser, Wesley C. +12 more
Both physical and dynamical properties must be considered to constrain the origins of the dynamically excited distant solar system populations. We present high-precision (g-r) colors for 25 small (H r > 5) dynamically excited trans-Neptunian objects (TNOs) and centaurs acquired as part of the Colours of the Outer Solar System Origins…
Interferometric observations of warm deuterated methanol in the inner regions of low-mass protostars
Codella, C.; Bianchi, E.; Ceccarelli, C. +7 more
Methanol is a key species in astrochemistry because it is the most abundant organic molecule in the interstellar medium and is thought to be the mother molecule of many complex organic species. Estimating the deuteration of methanol around young protostars is of crucial importance because it highly depends on its formation mechanisms and the physi…
The Role of Major Mergers and Nuclear Star Formation in Nearby Obscured Quasars
Ho, Luis C.; Zhao, Dongyao; Kim, Minjin +2 more
We investigate the triggering mechanism and the structural properties of obscured luminous active galactic nuclei from a detailed study of the rest-frame B and I Hubble Space Telescope images of 29 nearby (z ≈ 0.04-0.4) optically selected type 2 quasars. Morphological classification reveals that only a minority (34%) of the hosts are mergers or in…
Tidal Destruction in a Low-mass Galaxy Environment: The Discovery of Tidal Tails around DDO 44
Forbes, Duncan A.; Romanowsky, Aaron J.; Strader, Jay +10 more
We report the discovery of a ≳1° (∼50 kpc) long stellar tidal stream emanating from the dwarf galaxy DDO 44, a likely satellite of Local Volume galaxy NGC 2403 located ∼70 kpc in projection from its companion. NGC 2403 is a roughly Large Magellanic Cloud (LMC) stellar-mass galaxy 3 Mpc away, residing at the outer limits of the M81 group. We are ma…
Modeling the Multiple CME Interaction Event on 6-9 September 2017 with WSA-ENLIL+Cone
Temmer, M.; Dimmock, A. P.; Yordanova, E. +1 more
A series of coronal mass ejections (CMEs) erupted from the same active region between 4-6 September 2017. Later, on 6-9 September, two interplanetary (IP) shocks reached L1, creating a complex and geoeffective plasma structure. To understand the processes leading up to the formation of the two shocks, we model the CMEs with the Wang-Sheeley-Arge (…
ALMA Spatially Resolved Dense Molecular Gas Survey of Nearby Ultraluminous Infrared Galaxies
Imanishi, Masatoshi; Izumi, Takuma; Nakanishi, Kouichiro
We present the results of our Atacama Large Millimeter Array HCN J = 3-2 and HCO+ J = 3-2 line observations of a uniformly selected sample (>25) of nearby ultraluminous infrared galaxies (ULIRGs) at z < 0.15. The emission of these dense molecular gas tracers and continuum are spatially resolved in the majority of observed ULIRGs f…