Search Publications
Response of Jupiter's auroras to conditions in the interplanetary medium as measured by the Hubble Space Telescope and Juno
Wilson, R. J.; Kurth, W. S.; McComas, D. J. +24 more
We present the first comparison of Jupiter's auroral morphology with an extended, continuous, and complete set of near-Jupiter interplanetary data, revealing the response of Jupiter's auroras to the interplanetary conditions. We show that for ∼1-3 days following compression region onset, the planet's main emission brightened. A duskside poleward r…
The search for multiple populations in Magellanic Cloud Clusters - III. No evidence for multiple populations in the SMC cluster NGC 419
Martocchia, S.; Dalessandro, E.; Salaris, M. +16 more
We present the third paper about our ongoing Hubble Space Telescope survey for the search for multiple stellar populations (MPs) within Magellanic Cloud clusters. We report here the analysis of NGC 419, an ∼1.5 Gyr old, massive (≳2 × 105 M⊙) star cluster in the Small Magellanic Cloud (SMC). By comparing our photometric data w…
Two New Calcium-rich Gap Transients in Group and Cluster Environments
Gal-Yam, A.; Kulkarni, S. R.; Filippenko, A. V. +20 more
We present the Palomar Transient Factory discoveries and the photometric and spectroscopic observations of PTF11kmb and PTF12bho. We show that both transients have properties consistent with the class of calcium-rich gap transients, specifically lower peak luminosities and rapid evolution compared to ordinary supernovae, and a nebular spectrum dom…
Coronal Holes and Open Magnetic Flux over Cycles 23 and 24
Qiu, Jiong; Lowder, Chris; Leamon, Robert
As the observational signature of the footprints of solar magnetic field lines open into the heliosphere, coronal holes provide a critical measure of the structure and evolution of these lines. Using a combination of Solar and Heliospheric Observatory/Extreme ultraviolet Imaging Telescope (SOHO/EIT), Solar Dynamics Observatory/Atmospheric Imaging …
Reconciling solar and stellar magnetic cycles with nonlinear dynamo simulations
Strugarek, A.; Beaudoin, P.; Charbonneau, P. +2 more
The Sun's activity, including sun-spot activity, varies on an 11-year cycle driven by changes in its magnetic field. Other nearby solar-type stars have their own cycles, but the Sun does not seem to match their behavior. Strugarek et al. used magnetohydrodynamic simulations to show that stellar activity periods should depend on the star's Rossby n…
The Initial Mass Function in the Nearest Strong Lenses from SNELLS: Assessing the Consistency of Lensing, Dynamical, and Spectroscopic Constraints
van Dokkum, Pieter; Conroy, Charlie; Newman, Andrew B. +2 more
We present new observations of the three nearest early-type galaxy (ETG) strong lenses discovered in the SINFONI Nearby Elliptical Lens Locator Survey (SNELLS). Based on their lensing masses, these ETGs were inferred to have a stellar initial mass function (IMF) consistent with that of the Milky Way, not the bottom-heavy IMF that has been reported…
Alignment between Protostellar Outflows and Filamentary Structure
Bourke, Tyler L.; Myers, Philip C.; Dunham, Michael M. +13 more
We present new Submillimeter Array (SMA) observations of CO(2-1) outflows toward young, embedded protostars in the Perseus molecular cloud as part of the Mass Assembly of Stellar Systems and their Evolution with the SMA (MASSES) survey. For 57 Perseus protostars, we characterize the orientation of the outflow angles and compare them with the orien…
PSZ2LenS. Weak lensing analysis of the Planck clusters in the CFHTLenS and in the RCSLenS
Izzo, Luca; Sereno, Mauro; Ettori, Stefano +3 more
The possibly unbiased selection process in surveys of the Sunyaev Zel'dovich effect can unveil new populations of galaxy clusters. We performed a weak lensing analysis of the PSZ2LenS sample, i.e. the PSZ2 galaxy clusters detected by the Planck mission in the sky portion covered by the lensing surveys CFHTLenS and RCSLenS. PSZ2LenS consists of 35 …
Origin of small-scale anisotropies in Galactic cosmic rays
Mertsch, Philipp; Ahlers, Markus
The arrival directions of Galactic cosmic rays are highly isotropic. This is expected from the presence of turbulent magnetic fields in our Galactic environment that repeatedly scatter charged cosmic rays during propagation. However, various cosmic ray observatories have identified weak anisotropies of various angular sizes and with relative inten…
An ALMA survey of submillimetre galaxies in the COSMOS field: Physical properties derived from energy balance spectral energy distribution modelling
Magnelli, B.; Aussel, H.; Ilbert, O. +25 more
Context. Submillimetre galaxies (SMGs) represent an important source population in the origin and cosmic evolution of the most massive galaxies. Hence, it is imperative to place firm constraints on the fundamental physical properties of large samples of SMGs.
Aims: We determine the physical properties of a sample of SMGs in the COSMOS field t…