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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…
Tests of stellar model atmospheres by optical interferometry. IV. VINCI interferometry and UVES spectroscopy of Menkar
Wolff, B.; Driebe, T.; Wittkowski, M. +3 more
Aims.We present coordinated near-infrared K-band interferometric and optical spectroscopic observations of the M 1.5 giant
GOYA Survey: U and B Number Counts in the Groth-Westphal Strip
Eliche-Moral, M. Carmen; Balcells, Marc; Cristóbal-Hornillos, David +3 more
We present U and B galaxy differential number counts from a field of ~900 arcmin2, based on GOYA Survey imaging of the HST Groth-Westphal strip. Source detection efficiency corrections as a function of the object size have been applied. A variation of the half-exposure image method has been devised to identify and remove spurious detect…
The X-ray binary 2S0114+650=LSI+65 010. A slow pulsar or tidally-induced pulsations?
Koenigsberger, G.; Canalizo, G.; Richer, M. G. +4 more
Context: .The X-ray source 2S0114+650=LSI+65 010 is a binary system containing a B-type primary and a low mass companion believed to be a neutron star. The system has three reported periodicities: the orbital period, P_orb∼11.6 days, X-ray flaring with P_flare∼2.7 h and a "superorbital" X-ray periodicity P_super=30.7 days.
Aims: .The objective…