Search Publications
Stereoscopic Polar Plume Reconstructions from STEREO/SECCHI Images
Solanki, S. K.; Plunkett, S. P.; Feng, L. +7 more
We present stereoscopic reconstructions of the location and inclination of polar plumes of two data sets based on the two simultaneously recorded images taken by the EUVI telescopes in the SECCHI instrument package onboard the Solar TErrestrial RElations Observatory spacecraft. The 10 plumes investigated show a superradial expansion in the coronal…
Texes Observations of M Supergiants: Dynamics and Thermodynamics of Wind Acceleration
Harper, Graham M.; Brown, Alexander; Ryde, Nils +4 more
We have detected [Fe II] 17.94 µm and 24.52 µm emission from a sample of M supergiants (µ Cep, α Sco, α Ori, CE Tau, AD Per, and α Her) using the Texas Echelon Cross Echelle Spectrograph on NASA's Infrared Telescope Facility. These low opacity emission lines are resolved at R sime 50, 000 and provide new diagnostics of the dynami…
Endpoint Brightenings in Erupting Filaments
Wang, Y. -M.; Kliem, B.; Muglach, K.
Two well known phenomena associated with erupting filaments are the transient coronal holes that form on each side of the filament channel and the bright post-event arcade with its expanding double row of footpoints. Here we focus on a frequently overlooked signature of filament eruptions: the spike- or fan-shaped brightenings that appear to mark …
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…
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…
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…
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 …
The Properties of Horizontal Magnetic Elements in Quiet Solar Intranetwork
Wang, Jingxiu; Jin, Chunlan; Zhou, Guiping
Using the data observed by the Solar Optical Telescope/Spectropolarimeter aboard the Hinode satellite, the horizontal and vertical fields are derived from the wavelength-integrated measures of Zeeman-induced linear and circular polarizations. The quiet intranetwork regions are pervaded by horizontal magnetic elements. We categorize the horizontal …
Wide-Field Near-Infrared Imaging of the L1551 Dark Cloud
Pyo, Tae-Soo; Hayashi, Masahiko
We present wide-field near-infrared images of the densest part of the L1551 dark cloud taken with the narrow-band filters for [Fe II] λ 1.644 µm and H2 v = 1-0 S(1) lines, together with the broadband H and K s filters. Numerous [Fe II] and H2 emission features were detected from the regions around HL/XZ Tau, …