Search Publications
Temperature and variability of Pillan, Wayland Patera, and Loki Patera on Io from Cassini ISS data
Radebaugh, Jani; Stephens, Denise C.; Allen, Daniel R.
Cassini spacecraft images of Io obtained during its flyby of Jupiter in late 2000 and early 2001 were used to determine the lava composition and eruption style of three faint hot spots, Pillan, Wayland Patera, and Loki Patera. We found a maximum color temperature of 1130 ± 289 K for Pillan and maximum color temperatures of 1297 ± 289 K and 1387 ± …
Meteoric ion layers in the ionospheres of venus and mars: Early observations and consideration of the role of meteor showers
Christou, A. A.; Withers, Paul; Vaubaillon, J.
Layers of metal ions produced by meteoroid ablation have been known in Earth's ionosphere for decades, but have only recently been discovered at Venus and Mars. Here we report the results of a search for meteoric layers in earlier datasets from Venus and Mars. We find 13 candidates at Venus in Mariner 10, Venera 9/10, and Pioneer Venus Orbiter dat…
Warm gas in protostellar outflows. I. Flows from the low-mass protostars in L1448 and HH211
Menten, K. M.; Güsten, R.; Leurini, S. +3 more
Context. Observations of CO rotational transitions in the 0.3-0.4 millimeter range, now possible from exceptional sites on the ground, provide the opportunity of studying the warm component of molecular outflows in star-forming regions.
Aims: This study aims to characterize the role of the warm gas in high-velocity and collimated outflows fro…
Stereoscopic Analysis of the 31 August 2007 Prominence Eruption and Coronal Mass Ejection
Panasenco, O.; Hall, J. R.; Liewer, P. C.
The spectacular prominence eruption and CME of 31 August 2007 are analyzed stereoscopically using data from NASA's twin Solar Terrestrial Relations Observatory (STEREO) spacecraft. The technique of tie pointing and triangulation (T&T) is used to reconstruct the prominence (or filament when seen on the disk) before and during the eruption. For …
Spectropolarimetric investigation of the photosphere during a solar microflare
Kondrashova, N. N.
The results of the study of the thermodynamical parameters and the magnetic field in the solar photosphere during the solar microflare on 2009 July 4 in the active region NOAA 11024 are presented. The analysis is based on the observations with the French-Italian telescope THEMIS (Heliographic Telescope for the Study of the Magnetism and Instabilit…
Suzaku Detection of Thermal X-Ray Emission Associated with the Western Radio Lobe of Fornax A
Tashiro, Makoto S.; Inoue, Susumu; Seta, Hiromi
We present the results of X-ray mapping observations of the western radio lobe of the Fornax A galaxy, using the X-ray Imaging Spectrometer (XIS) onboard the Suzaku satellite with a total exposure time of 327 ks. The purpose of this study is to investigate the nature and spatial extent of the diffuse thermal emission around the lobe by exploiting …
Five fake ultra-luminous X-ray sources
Gutiérrez, C. M.
Context. The nature of ultra-luminous X-ray (ULX) sources is still a matter of debate. Studies of their counterparts in other spectral ranges will help to clarify the nature of those sources.
Aims: Our goal was to identify and characterize the optical counterparts of five sources catalogued as ULXs.
Methods: We obtained optical imaging a…
Multi-epoch Observations of the Red Wing Excess in the Spectrum of 3C 279
Punsly, Brian
It has been previously determined that there is a highly significant correlation between the spectral index from 10 GHz to 1350 Å and the amount of excess luminosity in the red wing of quasar C IV λ1549 broad emission lines (BELs). Ostensibly, the prominence of the red excess is associated with the radio jet emission mechanism and is most pronounc…
Photoelectrons in the Enceladus plume
Schippers, P.; Coates, A. J.; Thomsen, M. F. +5 more
The plume of Enceladus is a remarkable plasma environment containing several charged particle species. These include cold magnetospheric electrons, negative and positive water clusters, charged nanograins, and "magnetospheric photoelectrons" produced from ionization of neutrals throughout the magnetosphere near Enceladus. Here we discuss observati…
Dusty OB Stars in the Small Magellanic Cloud. II. Extragalactic Disks or Examples of the Pleiades Phenomenon?
Sandstrom, Karin M.; Bolatto, Alberto D.; Simon, Joshua D. +6 more
We use mid-infrared Spitzer spectroscopy and far-infrared Herschel photometry for a sample of 20 main sequence O9-B2 stars in the Small Magellanic Cloud (SMC) with strong 24 µm excesses to investigate the origin of the mid-IR emission. Either debris disks around the stars or illuminated patches of dense interstellar medium (ISM) can cause su…