Search Publications
Studying the kinematic asymmetries of disks and post-coalescence mergers using a new "kinemetry" criterion
Colina, L.; Arribas, S.; Bellocchi, E.
Context. Ultra luminous and luminous infrared galaxies [(U)LIRGs] are important galaxy populations for studying galaxy evolution, and are likely to have been responsible for a significant fraction of the star formation that occurred prior to z ~ 1. Local (U)LIRGs can be used to study criteria that are suitable for characterizing similar high redsh…
Chemistry of C3 and carbon chain molecules in DR21(OH)
Menten, K. M.; Krełowski, J.; Csengeri, T. +14 more
Context. C3 is the smallest pure carbon chain detected in the dense environment of star-forming regions, although diatomic C2 is detected in diffuse clouds. Measurement of the abundance of C3 and the chemistry of its formation in dense star-forming regions has remained relatively unexplored.
Aims: We aim to id…
Dissipation of Titan's north polar cloud at northern spring equinox
Nicholson, Philip D.; Sotin, Christophe; Barnes, Jason W. +10 more
Saturn's Moon Titan has a thick atmosphere with a meteorological cycle. We report on the evolution of the giant cloud system covering its north pole using observations acquired by the Visual and Infrared Mapping Spectrometer onboard the Cassini spacecraft. A radiative transfer model in spherical geometry shows that the clouds are found at an altit…
Deep X-Ray Observations of the Young High-magnetic-field Radio Pulsar J1119-6127 and Supernova Remnant G292.2-0.5
Ng, C. -Y.; Shannon, R.; Weltevrede, P. +4 more
High-magnetic-field radio pulsars are important transition objects for understanding the connection between magnetars and conventional radio pulsars. We present a detailed study of the young radio pulsar J1119-6127, which has a characteristic age of 1900 yr and a spin-down-inferred magnetic field of 4.1 × 1013 G, and its associated supe…
A multiwavelength study of evolved massive stars in the Galactic Centre
Morris, M. R.; Wang, Q. D.; Dong, H.
The central region of the Milky Way Galaxy provides a unique laboratory for a systematic, spatially resolved population study of evolved massive stars of various types in a relatively high-metallicity environment. We have conducted a multiwavelength data analysis of 180 such stars or candidates, most of which were drawn from a recent large-scale H…
The SLUGGS survey: globular cluster system kinematics and substructure in NGC 4365
Spitler, Lee R.; Forbes, Duncan A.; Romanowsky, Aaron J. +4 more
We present a kinematic analysis of the globular cluster (GC) system of the giant elliptical galaxy NGC 4365 and find several distinct kinematic substructures. This analysis is carried out using radial velocities for 269 GCs, obtained with the DEIMOS (DEep Imaging Multi-Object Spectrograph) instrument on the Keck II telescope as part of the SAGES L…
Why is IGR J17091-3624 So Faint? Constraints on Distance, Mass, and Spin from "Phase-resolved" Spectroscopy of the "Heartbeat" Oscillations
Rao, Anjali; Vadawale, S. V.
IGR J17091-3624 is a transient X-ray source and is believed to be a Galactic black hole candidate. Recently, it has received considerable attention due to the detection of peculiar variability patterns known as "heartbeats," which are quasi-periodic mini-outbursts repeated over timescales ranging between 5 and 70 s. So far, such variability patter…
Measurements of the Sun's High-latitude Meridional Circulation
Hathaway, David H.; Rightmire-Upton, Lisa; Kosak, Katie
The meridional circulation at high latitudes is crucial to the buildup and reversal of the Sun's polar magnetic fields. Here, we characterize the axisymmetric flows by applying a magnetic feature cross-correlation procedure to high-resolution magnetograms obtained by the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observator…
Titan's ionospheric composition and structure: Photochemical modeling of Cassini INMS data
Wahlund, J. -E.; Magee, B. A.; Mandt, K. E. +4 more
Titan's upper atmosphere produces an ionosphere at high altitudes from photoionization and electron impact that exhibits complex chemical processes in which hydrocarbons and nitrogen-containing molecules are produced through ion-molecule reactions. The structure and composition of Titan's ionosphere has been extensively investigated by the Ion and…
Using the Bullet Cluster as a Gravitational Telescope to Study z >~ 7 Lyman Break Galaxies
Stiavelli, Massimo; Treu, Tommaso; Bradač, Maruša +7 more
We use imaging obtained with the Hubble Space Telescope Wide Field Camera 3 to search for z 850 dropouts at z ~ 7 and J 110 dropouts at z ~ 9 lensed by the Bullet Cluster. In total we find 10 z 850 dropouts in our 8.27 arcmin2 field. Using magnification maps from a combined weak- and strong-lensing mass …