Search Publications
Resolving the Optical Emission Lines of Lyα Blob "B1" at z = 2.38: Another Hidden Quasar
Villar-Martín, M.; Dijkstra, M.; Overzier, R. A. +5 more
We have used the SINFONI near-infrared integral field unit on the Very Large Telescope to resolve the optical emission line structure of one of the brightest (L Lyα ≈ 1044 erg s-1) and nearest (z ≈ 2.38) of all Lyα blobs (LABs). The target, known in the literature as object "B1", lies at a redshift where the main o…
Estimating the Arrival Time of Earth-directed Coronal Mass Ejections at in Situ Spacecraft Using COR and HI Observations from STEREO
Srivastava, Nandita; Mishra, Wageesh
Predicting the arrival time and transit speed of coronal mass ejections (CMEs) near the Earth is critical to understanding the solar-terrestrial relationship. Even though STEREO observations now provide multiple views of CMEs in the heliosphere, the true speeds derived from stereoscopic reconstruction of SECCHI coronagraph data are not quite suffi…
Mapping HF waves in the reconnection diffusion region
Pickett, J. S.; André, M.; Vaivads, A. +2 more
We study in detail high-frequency (HF) plasma waves between the electron cyclotron and plasma frequencies within a reconnection diffusion region (DR) encountered by Cluster in the magnetotail using continuous electric field waveforms. We identify three wave types, all observed within the separatrix regions: Langmuir waves (LW), electrostatic solit…
NGC 6240 : extended CO structures and their association with shocked gas
Aussel, H.; Elbaz, D.; Le Floc'h, E. +7 more
We present deep CO(1-0) observations of
The Formation of the Massive Galaxies in the SSA22 z = 3.1 Protocluster
Lehmer, B. D.; Alexander, D. M.; Kubo, M. +15 more
We study the properties of K-band-selected galaxies (K AB < 24) in the z = 3.09 SSA22 protocluster field. 430 galaxies at 2.6 < z phot < 3.6 are selected as potential protocluster members in a 112 arcmin2 area based on their photometric redshifts. We find that ≈20% of the massive galaxies with stellar mass…
Accuracy of magnetic energy computations
Démoulin, P.; Masson, S.; Pariat, E. +1 more
Context. For magnetically driven events, the magnetic energy of the system is the prime energy reservoir that fuels the dynamical evolution. In the solar context, the free energy (i.e., the energy in excess of the potential field energy) is one of the main indicators used in space weather forecasts to predict the eruptivity of active regions. A tr…
The Velocity Anisotropy of Distant Milky Way Halo Stars from Hubble Space Telescope Proper Motions
Brown, T. M.; Deason, A. J.; Guhathakurta, P. +2 more
Based on long baseline (5-7 years) multi-epoch HST/ACS photometry, used previously to measure the proper motion of M31, we present the proper motions (PMs) of 13 main-sequence Milky Way halo stars. The sample lies at an average distance of r ~= 24 kpc from the Galactic center, with a root-mean-square spread of 6 kpc. At this distance, the median P…
Remote energetic neutral atom imaging of electric potential over a lunar magnetic anomaly
Barabash, S.; Futaana, Y.; Wurz, P. +5 more
<title type="main">Abstract<p label="1">The formation of electric potential over lunar magnetized regions is essential for understanding fundamental lunar science, for understanding the lunar environment, and for planning human exploration on the Moon. A large positive electric potential was predicted and detected from single point mea…
Dusty Plasma Effects in Comets: Expectations for Rosetta
Mendis, D. A.; Horányi, M.
Despite their small masses, comets have played an extraordinary role in enhancing our understanding of cosmic physics. It was the calculation of comet Halley's orbit and the successful prediction of its return in 1758 that firmly established the correctness of Newton's law of universal gravitation. It was the morphology of the dusty tails of comet…
A Statistical Study of Transverse Oscillations in a Quiescent Prominence
Erdélyi, R.; Hillier, A.; Morton, R. J.
The launch of the Hinode satellite has allowed for seeing-free observations at high-resolution and high-cadence making it well suited to study the dynamics of quiescent prominences. In recent years it has become clear that quiescent prominences support small-amplitude transverse oscillations, however, sample sizes are usually too small for general…