Search Publications
CNO Abundances in Metal-Rich Environments: Infrared Space Observatory Spectroscopy of Ionized Gas in M51
Skillman, Evan D.; Garnett, Donald R.; Edmunds, Michael G. +2 more
We present Infrared Space Observatory (ISO) Long Wavelength Spectrograph observations centered on the H II region CCM 10 in the spiral galaxy M51. We detect several emission lines in this spectrum, including [O I] 63 and 145 µm, [C II] 158 µm, [O III] 88 µm, and [N II] 122 µm, with a significant upper limit on [N III] 57 &m…
Did η Carinae's Weigelt Blobs Originate circa 1941?
Currie, Douglas G.; Hajian, Arsen R.; Dorland, Bryan N.
We report astrometric measurements of η Carinae's Weigelt blobs C and D (also known as speckle objects C and D) derived from observations with the Hubble Space Telescope Wide Field Planetary Camera 2. Using three epochs of data with a temporal baseline of 5.9 yr, we measure blob D's proper motion relative to the central star to be 4.4+/-1.4 mas yr…
Evolution in the Colors of Lyman Break Galaxies from z~4 to z~3
Papovich, Casey; Dickinson, Mark; Ferguson, Henry C. +11 more
The integrated colors of distant galaxies provide a means for interpreting the properties of their stellar content. Here we use rest-frame UV-to-optical colors to constrain the spectral energy distributions and stellar populations of color-selected, B-dropout galaxies at z~4 in the Great Observatories Origins Deep Survey (GOODS). We combine the Ad…
Far-Ultraviolet Spectroscopic Analyses of Four Central Stars of Planetary Nebulae
Bianchi, L.; Herald, J. E.
We analyze the far-UV/UV spectra of four central stars of planetary nebulae (CSPNs) with strong wind features-NGC 2371, A78, IC 4776, and NGC 1535-and derive their photospheric and wind parameters by modeling high-resolution FUSE (Far Ultraviolet Spectroscopic Explorer) data in the far-UV and HST (Hubble Space Telescope) STIS and IUE data in the U…
Signature of oscillations in coronal bright points
Doyle, J. G.; Madjarska, M. S.; O'Shea, E. +1 more
A detailed study of two consecutive bright points observed simultaneously with the Coronal Diagnostic Spectrometer (CDS), the Extreme ultraviolet Imaging Telescope (EIT) and the Michelson Doppler Imager (MDI) onboard the Solar and Heliospheric Observatory (SOHO) is presented. The analysis of the evolution of the photospheric magnetic features and …
Alfvén waves in the foreshock propagating upstream in the plasma rest frame: statistics from Cluster observations
Fränz, M.; Dandouras, I.; Glassmeier, K. +8 more
Available from http://www.copernicus.org/site/EGU/annales/22/7/2315.htm?FrameEngine=false;
O VI, N V, and C IV in the Galactic Halo. II. Velocity-Resolved Observations with the Hubble Space Telescope and Far Ultraviolet Spectroscopic Explorer
Shull, J. Michael; Indebetouw, Rémy
We present a survey of N V and O VI (and, where available, C IV) in the Galactic halo, using data from the Far Ultraviolet Spectroscopic Explorer (FUSE) and the Hubble Space Telescope (HST) along 34 sight lines. These ions are usually produced in nonequilibrium processes such as shocks, evaporative interfaces, or rapidly cooling gas, and thus trac…
Motion and orientation of magnetic field dips and peaks in the terrestrial magnetosheath
Balogh, A.; Dandouras, I.; RèMe, H. +2 more
Using data from the four Cluster spacecraft, estimates of the motion of isolated magnetic field dips and peaks in the magnetosheath are presented. Their motion and orientation are deduced using four-spacecraft timing, with typical spacecraft separations of ∼100 km. A set of 39 clear isolated dips and 12 peaks, spread over 4 days, is considered. Th…
XMM-Newton Observations of A133: A Weak Shock Passing through the Cool Core
Sarazin, Craig L.; Reiprich, Thomas H.; Ehle, M. +5 more
We use XMM-Newton observations of the cluster of galaxies A133 to study the X-ray spectrum of the intracluster medium (ICM). We find a cold front to the southeast of the cluster core. From the pressure profile near the cold front, we derive an upper limit to the velocity of the core relative to the rest of the cluster of less than 230 km s-1<…
A Comparison of the Outer Atmosphere of the ``Flat Activity'' Star τ Ceti (G8 V) with the Sun (G2 V) and α Centauri A (G2 V)
Ayres, Thomas R.; Judge, Philip G.; Carlsson, Mats +1 more
Driven by the desire to understand the roles of acoustic and magnetic mechanisms in heating the outer atmospheres of Sun-like stars, we compare solar UV spectra with archival STIS spectra from the Hubble Space Telescope of α Cen A (G2 V) and new STIS spectra of the extremely inactive dwarf star τ Cet (G8 V, V=3.5). The activity of τ Cet shows occa…