Search Publications
Longitude dependences of Saturn's ultraviolet aurora
Carbary, J. F.
on periodicities in the kilometric radio emissions, the Saturn Longitude System 4 (SLS4) was used to organize the far ultraviolet (120-150 nm) aurora observed by the Ultraviolet Imaging Spectrograph on the Cassini spacecraft. Individual Ultraviolet Imaging Spectrograph pixels were projected onto the ionosphere of Saturn, transformed into the SLS4 …
Saturn's magnetospheric refresh rate
Krupp, N.; Jackman, C. M.; Mitchell, D. G. +3 more
A 2-3 day periodicity observed in Jupiter's magnetosphere (superposed on the giant planet's 9.5 h rotation rate) has been associated with a characteristic mass-loading/unloading period at Jupiter. We follow a method derived by Kronberg et al. (<link href="#grl50530-bib-0016"/>) and find, consistent with their results, that this period is mos…
Propagation of Fast Coronal Mass Ejections and Shock Waves Associated with Type II Radio-Burst Emission: An Analytic Study
Aguilar-Rodriguez, E.; Corona-Romero, P.; Gonzalez-Esparza, J. A.
Coronal mass ejections (CMEs) are large-scale eruptive events in the solar corona. Once they are expelled into the interplanetary (IP) medium, they propagate outwards and "evolve" interacting with the solar wind. Fast CMEs associated with IP shocks are a critical subject for space weather investigations. We present an analytic model to study the h…
The M 4 Core Project with HST: I. Overview and first epoch
van den Berg, M.; Anderson, J.; Milone, A. P. +13 more
We present an overview of the ongoing Hubble Space Telescope large program GO-12911. The program is focused on the core of M 4, the nearest Galactic globular cluster, and the observations are designed to constrain the number of binaries with massive companions (black holes, neutron stars, or white dwarfs) by measuring the ``wobble'' of the luminou…
The Parsec-scale Environment and the Evolutionary Status of MWC 349A
Strelnitski, Vladimir; Bieging, John H.; Hora, Joseph +4 more
We report on a study of the ~10' (~5 pc in projection) environs of the peculiar, high-luminosity emission-line star MWC 349A in the IR, radio, and visible domains. Besides the recently discovered X-shaped, arcmin-scale IR nebula centered on MWC 349A ("X nebula"), with the kinematic age of ~104 yr, we identify several young objects point…
Structural Parameters for Globular Clusters in M31
Ma, Jun; Wang, Song
In this paper, we present surface brightness profiles for 79 globular clusters in M31, using images observed with the Hubble Space Telescope, some of which are from new observations. The structural and dynamical parameters are derived from fitting the profiles to several different models for the first time. The results show that in the majority of…
Fundamental vibrational transitions of hydrogen chloride detected in CRL 2136
Menten, K. M.; Neufeld, D. A.; Geballe, T. R. +3 more
Aims: We would like to understand the chemistry of dense clouds and their hot cores more quantitatively by obtaining more complete knowledge of the chemical species present in them.
Methods: We have obtained high-resolution infrared absorption spectroscopy at 3-4 µm toward the bright infrared source CRL 2136.
Results: The fund…
Study of Magnetic Helicity Injection in the Active Region NOAA 9236 Producing Multiple Flare-associated Coronal Mass Ejection Events
Chae, Jongchul; Park, Sung-Hong; Kumar, Pankaj +6 more
To better understand a preferred magnetic field configuration and its evolution during coronal mass ejection (CME) events, we investigated the spatial and temporal evolution of photospheric magnetic fields in the active region NOAA 9236 that produced eight flare-associated CMEs during the time period of 2000 November 23-26. The time variations of …
Probing the flyby anomaly with the future STE-QUEST mission
Hechenblaikner, G.; Páramos, Jorge
In this study, we demonstrate that the flyby anomaly, an unexpected acceleration detected in some of the gravitational assists of the Galileo, NEAR, Cassini and Rosetta spacecraft, could be probed by accurate orbital tracking available in the proposed Space-Time Explorer and Quantum Equivalence Principle Space Test (STE-QUEST); following a recent …
Broad N2H+ Emission toward the Protostellar Shock L1157-B1
Podio, L.; Codella, C.; Ceccarelli, C. +8 more
We present the first detection of N2H+ toward a low-mass protostellar outflow, namely, the L1157-B1 shock, at ~0.1 pc from the protostellar cocoon. The detection was obtained with the IRAM 30 m antenna. We observed emission at 93 GHz due to the J = 1-0 hyperfine lines. Analysis of this emission coupled with HIFI CHESS multili…