Search Publications
Planck constraints on Higgs modulated reheating of renormalization group improved inflation
Qiu, Taotao; Cai, Yi-Fu; Chang, Yu-Chiao +2 more
Within the framework of renormalization group improved inflationary cosmology motivated by asymptotically safe gravity, we study the dynamics of a scalar field which can be interpreted as the Higgs field. The background trajectories of this model can provide sufficient inflationary e-folds and a graceful exit to a radiation dominated phase. We stu…
Ultracompact dwarfs around NGC 3258 in the Antlia cluster
Richtler, Tom; Faifer, Favio R.; Smith Castelli, Analía V. +2 more
We present the first compact stellar systems with luminosities in the range of ultracompact dwarfs (UCDs), discovered in the Antlia galaxy cluster (-10.5 < MV < -11.6). The magnitude limit between UCDs and globular clusters (CGs) is discussed. By means of imaging from VLT (FORS1), CTIO (MOSAIC) and the Hubble Space Telescope (ACS)…
The Herschel Gould Belt Survey in Chamaeleon II. Properties of cold dust in disks around young stellar objects
Prusti, T.; Pilbratt, G. L.; André, Ph. +14 more
Context. We report on the Herschel Gould Belt survey (HGBS) of the Chamaeleon II (Cha II) star-forming region, focusing on the detection of Class I to III young stellar objects (YSOs).
Aims: We aim at characterizing the circumstellar material around these YSOs and at understanding which disk parameters are most likely constrained by the new H…
Jupiter's aurora in ultraviolet and infrared: Simultaneous observations with the Hubble Space Telescope and the NASA Infrared Telescope Facility
Bonfond, B.; Grodent, D.; Radioti, A. +2 more
We compare Jupiter's northern auroral emissions in infrared (IR) and ultraviolet (UV) using ground-based IR observations from the NASA Infrared Telescope Facility and UV observations from Hubble Space Telescope on 16 December 2000, the only date for which simultaneous observations in the two wavelength regions exist. We use polar projections and l…
Co-registration of lunar topographic models derived from Chang’E-1, SELENE, and LRO laser altimeter data based on a novel surface matchingmethod
Wu, Bo; Guo, Jian; Hu, Han +2 more
Various lunar digital topographic models (DTMs) have been generated from the data collected from earlier and recent lunar missions. There are usually inconsistencies among them due to differences in sensor configurations, data acquisition periods, and production techniques. To obtain maximum value for science and exploration, the multi-source luna…
A Suzaku X-ray observation of one orbit of the supergiant fast X-ray transient IGR J16479-4514
Tomsick, J. A.; Rodriguez, J.; Sidoli, L. +6 more
We report on a 250 ks long X-ray observation of the supergiant fast X-ray transient IGR J16479-4514 performed with Suzaku in 2012 February. During this observation, about 80 per cent of the short orbital period (Porb ∼ 3.32 d) was covered as continuously as possible for the first time. The source light curve displays variability of more…
Revision of empirical electric field modeling in the inner magnetosphere using Cluster data
Khotyaintsev, Yu. V.; Torbert, R. B.; Matsui, H. +2 more
Using Cluster data from the Electron Drift (EDI) and the Electric Field and Wave (EFW) instruments, we revise our empirically-based, inner-magnetospheric electric field (UNH-IMEF) model at 2<L<10. We pick more EFW data during large activities when wake effects are expected to be small. The model is organized by either the interplanetary elec…
Discovery of a Quadruple Lens in CANDELS with a Record Lens Redshift z = 1.53
Ferguson, H. C.; Finkelstein, S. L.; Rudnick, G. H. +10 more
Using spectroscopy from the Large Binocular Telescope and imaging from the Hubble Space Telescope we discovered the first strong galaxy lens at z lens > 1. The lens has a secure photometric redshift of z = 1.53 ± 0.09 and the source is spectroscopically confirmed at z = 3.417. The Einstein radius (0.''35; 3.0 kpc) encloses 7.6 × 10
The evolution of flux pileup regions in the plasma sheet: Cluster observations
Dandouras, I.; Nilsson, H.; André, M. +9 more
Bursty bulk flows (BBFs) play an important role for the mass, energy, and magnetic flux transport in the plasma sheet, and the flow pattern in and around a BBF has important consequences for the localized energy conversion between the electromagnetic and plasma mechanical energy forms. The plasma flow signature in and around BBFs is often rather c…
On the performance of global magnetohydrodynamic models in the Earth's magnetosphere
Raeder, J.; Wiltberger, M.; Palmroth, M. +5 more
We study the performance of four magnetohydrodynamic models (BATS-R-US, GUMICS, LFM, OpenGGCM) in the Earth's magnetosphere. Using the Community Coordinated Modeling Center's Run-on-Request system, we compare model predictions with magnetic field measurements of the Cluster, Geotail and Wind spacecraft during a multiple substorm event. We also com…