Search Publications
Observations of non-LTE emission at 4 5 microns with the planetary Fourier spectrometer abord the Mars Express mission
Lopez-Valverde, M. A.; D'Aversa, E.; Formisano, V. +2 more
We report on PFS-MEX (Planetary Fourier Spectrometer on board Mars Express) limb observations of the non-Local Thermodynamic Equilibrium emission by CO and CO 2 isotopic molecules. The CO emission is observed peaking at altitudes lower than the CO 2 emission peak. Two orbits have been considered, which explore latitudes from …
High-Resolution Absorption Spectroscopy of Multiphase, High-Metallicity Gas Associated with the Luminous Quasar HE 0226-4110
Tripp, Todd M.; Sembach, Kenneth R.; Savage, Blair D. +2 more
We present FUSE and HST STIS observations of the absorption-line system near the emission redshift of the radio-quiet, X-ray-bright quasar HE 0226-4110 (z=0.495, V=15.2). The spectra cover the rest-frame wavelength range 610-1150 Å, and we detect a wide range of ionization species, including four adjacent stages of oxygen: O III-VI, which reveal a…
Deep Imaging Surveys of Star-forming Clouds. IV. The Meek and the Mighty: Outflows from Young Stars in Chamaeleon I
Bally, John; Fazio, Giovanni; Walawender, Josh +1 more
We present a survey of shocks and outflows in the Chamaeleon I star-forming complex using Hα, [S II], and SDSS i' images obtained from the ground, an i' image obtained with the Hubble Space Telescope, and 4.5 µm images obtained with the Infrared Array Camera (IRAC) on the Spitzer Space Telescope. We find new Herbig-Haro (HH) objects and exte…
Observation of a bright coronal downflow by SOHO/EIT
Solanki, S. K.; Schwenn, R.; Mierla, M. +3 more
A distinct coronal downflow has been discovered in the course of a prominence eruption associated coronal mass ejection (CME) imaged by EIT (Extreme ultraviolet Imaging Telescope) and LASCO (Large Angle Spectrometric Coronagraph) on board SOHO (Solar and Heliospheric Observatory) on 5-Mar.-2000. Evolution of the prominences seen by EIT was tracked…
Confronting X-Ray Emission Models with the Highest Redshift Kiloparsec-Scale Jets: The z=3.89 Jet in Quasar 1745+624
Cheung, C. C.; Stawarz, Ł.; Siemiginowska, A.
A newly identified kiloparsec-scale X-ray jet in the high-redshift z=3.89 quasar 1745+624 is studied with multifrequency radio, HST, and Chandra X-ray imaging data. This is only the third large-scale X-ray jet beyond z>3 known and is further distinguished as being the most luminous relativistic jet observed at any redshift, exceeding 1045<…
Helioseismically Determined Near-Surface Flows Underlying a Quiescent Filament
Toomre, Juri; Hindman, Bradley W.; Haber, Deborah A.
The extended filaments seen in Hα images of the solar disk, and the corresponding prominences when viewed at the solar limb, are one of the great hallmarks of solar magnetism. Such arches of magnetic field and the coronal plasma structures they support are both beautiful and enigmatic. Many models of filament formation and maintenance invoke the e…
Evolving Photospheric Flux Concentrations and Filament Dynamic Changes
Aulanier, G.; Schmieder, B.; Mein, P. +1 more
We analyze the role of weak photospheric flux concentrations that evolve in a filament channel, in the triggering of dynamic changes in the shape of a filament. The high polarimetric sensitivity of THEMIS allowed us to detect weak flux concentrations (few Gauss) associated with the filament development. The synoptic instruments (MDI, SOLIS) even i…
The Intercalibration of SOHO EIT, CDS-NIS, and TRACE
Warren, Harry P.; Brooks, David H.
Using coordinated observations of a quiet coronal region, we study the intercalibration of the CDS and EIT instruments on board the Solar and Heliospheric Observatory (SOHO) and the Transition Region and Coronal Explorer (TRACE). We derive the differential emission measure (DEM) distribution from CDS spectral line intensities and convolve it with …
V4332 Sgr in `Quiescence'
Kimeswenger, S.
In 1994 V4332 Sgr underwent a mysterious eruption. Somehow its fast evolution towards a red giant star was, lacking alternative classifications, connected to the red variable M31 RV, which had its eruption in 1988. The red eruptive variable V838 Mon draw the attention back to its 'older twin' V4332 Sgr in February 2002. The new precise photometry …
Hubble Space Telescope Imaging of the Outburst Site of M31 RV
Bond, Howard E.; Siegel, Michael H.
M31 RV is a luminous red variable star that appeared for several months in the bulge of M31 during 1988. Unlike classical novae, M31 RV was cool throughout its outburst. Interest in this object has been revived recently because of its strong resemblance to V838 Mon, a luminous Galactic variable star that appeared in 2002 and is illuminating a spec…