Search Publications
Size, shape, and orientation of magnetosheath mirror mode structures
Horbury, T. S.; Lucek, E. A.
Information about the size, shape, and orientation of mirror mode structures in the magnetosheath is obtained by combining data from the four Cluster spacecraft, resulting in an estimate of the form of the magnetic field magnitude spatial autocorrelation function. It is shown that the longest direction of the structures is typically inclined at ar…
Hubble Space Telescope Observations of the Quasar PKS 0637-752: Equipartition Electron-Proton Jet from the Most Complete Spectral Coverage to Date
Perlman, Eric S.; Georganopoulos, Markos; Chartas, George +2 more
We present new Near-Infrared Camera and Multi-Object Spectrometer and attitude control system observations of the quasar jet PKS 0637-752, and we use them, together with existing multiwavelength observations, to produce the most complete spectral coverage of the source to date. We explore the implications of these observations in the context of mo…
Plume ionosphere of Enceladus as seen by the Cassini ion and neutral mass spectrometer
Luhmann, J. G.; Ip, W. -H.; McNutt, R. L. +4 more
The Cassini spacecraft passed within 168 km of the surface of Enceladus on 14 July 2005 during the E2 flyby and passed closer (50 km) during the E3 encounter on 13 March 2008. During both flybys the ion and neutral mass spectrometer (INMS) detected a plume atmosphere mainly composed of water. During the E3 flyby, the INMS measured an ion mass spec…
Characterizing the Properties of Clusters of Galaxies as a Function of Luminosity and Redshift
Goobar, A.; Peterson, J. R.; Madejski, G. +1 more
We report the application of the new Monte Carlo method, smoothed particle inference (SPI, described in a pair of companion papers), toward analysis and interpretation of X-ray observations of clusters of galaxies with the XMM-Newton satellite. Our sample consists of publicly available well exposed observations of clusters at redshifts z > 0.06…
Analysis of the three-dimensional stellar velocity field using vector spherical functions
Tsvetkov, A. S.; Vityazev, V. V.
We apply vector spherical functions to problems of stellar kinematics. Using these functions allows all of the systematic components in the stellar velocity field to be revealed without being attached to a specific physical model. Comparison of the theoretical decomposition coefficients of the equations for a particular kinematical model with obse…
The X-Ray Power Spectral Density Function and Black Hole Mass Estimate for the Seyfert Active Galactic Nucleus IC 4329a
Markowitz, A.
We present the X-ray broadband power spectral density function (PSD) of the X-ray-luminous Seyfert IC 4329a, constructed from light curves obtained via Rossi X-ray Timing Explorer monitoring and an XMM-Newton observation. Modeling the 3-10 keV PSD using a broken power-law PSD shape, a break in power-law slope is significantly detected at a tempora…
On the derivation of dynamical masses of the stellar clusters in the circumnuclear region of NGC2903
Terlevich, Roberto; Terlevich, Elena; Díaz, Ángeles I. +2 more
Gas and star velocity dispersions have been derived for four circumnuclear star-forming regions (CNSFRs) and the nucleus of the spiral galaxy NGC2903 using high-resolution spectroscopy in the blue and far red. Stellar velocity dispersions have been obtained from the CaII triplet lines at λλ8494, 8542, 8662Å, using cross-correlation techniques, whi…
Solar Wind Charge Exchange Emission from the Helium Focusing Cone: Model to Data Comparison
Kuntz, K. D.; Snowden, S. L.; Lallement, R. +2 more
A model for heliospheric solar wind charge exchange (SWCX) X-ray emission is applied to a series of XMM-Newton observations of the interplanetary focusing cone of interstellar helium. The X-ray data are from three coupled observations of the South Ecliptic Pole (SEP; to observe the cone) and the Hubble Deep Field-North (HDF-N, to monitor global va…
Carbon Abundance in Small Magellanic Cloud Planetary Nebulae Through Advanced Camera for Surveys Prism Spectroscopy: Constraining Stellar Evolution at Low Metallicity
Villaver, Eva; Balick, Bruce; Shaw, Richard A. +2 more
We perform near ultraviolet ACS prism spectroscopy of 11 Small Magellanic Cloud (SMC) planetary nebulae (PNe) with the main aim of deriving the abundance of carbon. The analysis of the ACS spectra provides reliable atomic carbon abundances for all but a couple of our targets; ionic C2+ abundances are calculated for all target PNe. With …
Reconstruction of a large-scale reconnection exhaust structure in the solar wind
Farrugia, C. J.; Hu, Q.; Teh, W. -L. +1 more
We recover two-dimensional (2-D) magnetic field and flow field configurations from three spacecraft encounters with a single large-scale reconnection exhaust structure in the solar wind, using a new reconstruction method (Sonnerup and Teh, 2008) based on the ideal single-fluid MHD equations in a steady-state, 2-D geometry. The reconstruction is pe…