Search Publications
Formation and Evolution of the Large-Scale Magnetic Fields in Venus' Ionosphere: Results From a Three Dimensional Global Multispecies MHD Model
Luhmann, Janet; Toth, Gabor; Nagy, Andrew +2 more
Large-scale magnetic fields have been observed in Venus' ionosphere by both the Pioneer Venus Orbiter (PVO) and Venus Express spacecraft. In this study, we examine the formation and evolution of the large-scale magnetic field in the Venus ionosphere using a sophisticated global multispecies Magnetohydrodynamics (MHD) model that has been developed …
The Blanco DECam bulge survey. I. The survey description and early results
Clarkson, William I.; Robin, Annie C.; Martin, Nicolas +18 more
The Blanco Dark Energy Camera (DECam) Bulge survey is a Vera Rubin Observatory (LSST) pathfinder imaging survey, spanning ~200 deg2 of the Southern Galactic bulge, -2° < b < -13° and -11° < l < +11°. We have employed the CTIO-4 m telescope and the DECam to image a contiguous ~200 deg2 region of the relatively less…
Propagation of waves above a plage as observed by IRIS and SDO
Srivastava, A. K.; Mathioudakis, M.; Jelínek, P. +2 more
Context. Magnetohydrodynamic waves are proposed as the mechanism that transport sufficient energy from the photosphere to heat the transition region (TR) and corona. However, various aspects of these waves, such as their nature, propagation characteristics, and role in the atmospheric heating process, remain poorly understood and require further i…
H0LiCOW - XI. A weak lensing measurement of the external convergence in the field of the lensed quasar B1608+656 using HST and Subaru deep imaging
Treu, T.; Fassnacht, C. D.; Meylan, G. +11 more
We investigate the environment and line of sight (LoS) of the H0LiCOW (H0 Lenses in COSMOGRAIL's Wellspring) lens B1608+656 using Subaru Suprime-Cam and the Hubble Space Telescope (HST) to perform a weak lensing analysis. We compare three different methods to reconstruct the mass map of the field, i.e. the standard Kaiser-Squires invers…
Modelling the AGN broad-line region using single-epoch spectra - II. Nearby AGNs
Treu, T.; Vestergaard, M.; Peterson, B. M. +4 more
The structure of the broad-line region (BLR) is an essential ingredient in the determination of active galactic nucleus (AGN) virial black hole masses, which in turn are important to study the role of black holes in galaxy evolution. Constraints on the BLR geometry and dynamics can be obtained from velocity-resolved studies using reverberation map…
Prospects for measuring Mercury's tidal Love number h2 with the BepiColombo Laser Altimeter
Oberst, J.; Iess, L.; Kallenbach, R. +7 more
Context. The Love number h2 describes the radial tidal displacements of Mercury's surface and allows constraints to be set on the inner core size when combined with the potential Love number k2. Knowledge of Mercury's inner core size is fundamental to gaining insights into the planet's thermal evolution and dynamo working pri…
Contribution of Anisotropic Electron Current to the Magnetotail Current Sheet as a Function of Location and Plasma Conditions
Petrukovich, A. A.; Russell, C. T.; Artemyev, A. V. +7 more
The magnetotail current sheet carries the current responsible for the largest fraction of the energy storage in the magnetotail, the magnetic energy in the lobes. It is thus inextricably linked with the dynamics and evolution of many magnetospheric phenomena, such as substorms. The magnetotail current sheet structure and stability depend mostly on…
A kpc-scale-resolved study of unobscured and obscured star formation activity in normal galaxies at z = 1.5 and 2.2 from ALMA and HiZELS
Ivison, R. J.; Smail, Ian; Sobral, David +12 more
We present Atacama Large Millimeter/Submillimeter Array (ALMA) continuum observations of a sample of nine star-forming galaxies at redshifts 1.47 and 2.23 selected from the High-z Emission Line Survey (HiZELS). Four galaxies in our sample are detected at high significance by ALMA at a resolution of 0 ${_{.}^{\prime\prime}}$ 25 at rest-frame 355 &m…
Detection of a variable ultrafast outflow in the narrow-line Seyfert 1 galaxy PG 1448+273
Fabian, A. C.; Reynolds, C. S.; Pinto, C. +4 more
Relativistically blueshifted absorption features of highly ionized ions, the so-called ultrafast outflows (UFOs), have been detected in the X-ray spectra of a number of accreting supermassive black holes. If these features truly originate from accretion disc winds accelerated to more than 10 per cent of the speed of light, their energy budget is v…
Implications of a proton blazar inspired model on correlated observations of neutrinos with gamma-ray flaring blazars
Bhadra, Arunava; Majumdar, Debasish; Banik, Prabir +1 more
The recent detections of the neutrino event IceCube-170922A, 13 muon-neutrino events observed in 2014-2015 and the IceCube-141209A by IceCube observatory from the Blazars TXS 0506 +056 , PKS 0502 +049 /TXS 0506 +056 , and GB6 J1040+0617 respectively, all of which were in the state of enhanced gamma-ray emission, indicate that cosmic rays are accel…