Search Publications
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…
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
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…
A historic jet-emission minimum reveals hidden spectral features in 3C 273
Lähteenmäki, A.; Foellmi, C.; O'Brien, P. T. +14 more
Aims. The aim of this work is to identify and study spectral features in the quasar 3C 273 usually blended by its strong jet emission.
Methods: . A historic minimum in the sub-millimetre emission of 3C 273 triggered coordinated multi-wavelength observations in June 2004. X-ray observations from the INTEGRAL, XMM-Newton and RXTE satellites are…
New southern blue compact dwarf galaxies in the 2dF Galaxy redshift survey
Thuan, T. X.; Izotov, Y. I.; Papaderos, P. +3 more
Aims.Aiming to find new extremely metal-deficient star-forming galaxies we extracted from the Two-Degree Field Galaxy Redshift Survey (2dFGRS) 100 K Data Release 14 emission-line galaxies with relatively strong [O iii] λ4363 emission.
Methods: .Spectroscopic and photometric studies of this sample and, in addition, of 7 Tololo and 2 UM galaxies…
Strange magnification pattern in the large separation lens SDSS J1004+4112 from optical to X-rays
Christensen, L.; Schwope, A.; Wisotzki, L. +1 more
We present simultaneous XMM-Newton UV and X-ray observations of the quadruply lensed quasar
Globular cluster systems of six shell galaxies
Peletier, R. F.; Balcells, M.; Valentijn, E. A. +2 more
Context: .Shells in Elliptical Galaxies are faint, sharp-edged features, believed to provide evidence of a recent (∼ 0.5 - 2 × 109 years ago) merger event. We analyse the Globular Cluster (GC) systems of six shell elliptical galaxies, to examine the effects of mergers upon the GC formation history.
Aims: .We examine the colour dist…
Magnetoacoustic wave propagation in off-limb polar regions
Doyle, J. G.; Banerjee, D.; O'Shea, E.
Aims.To find evidence of magnetoacoustic waves in off-limb polar regions.
Methods: .Using temporal series data from the Coronal Diagnostic Spectrometer (CDS) on SOHO, we study oscillations found in radiant flux and velocity measurements from transition region and coronal spectral lines. We use Fourier techniques to measure phase delays between…
Why is the mass function of NGC 6218 flat?
Pulone, L.; Paresce, F.; de Marchi, G.
We have used the FORS-1 camera on the VLT to study the main sequence (MS) of the globular cluster NGC 6218 in the V and R bands. The observations cover an area of 3.4 arcmin × 3.4 arcmin around the cluster centre and probe the stellar population out to the cluster's half-mass radius (rh ≃ 2.2 arcmin). The colour-magnitude diagram (CMD) …
The super-soft source XMMU J052016.0-692505 in the LMC. A likely white dwarf Be/X-ray binary
Haberl, F.; Kahabka, P.; Filipović, M. D. +1 more
Aims.We report the discovery of the super-soft X-ray source XMMU J052016.0-692505 in the LMC with XMM-Newton.
Methods: .We analyse the EPIC spectra of XMMU J052016.0-692505 and study the likely optical counterpart LMCV2135.
Results: .Using an absorbed blackbody spectrum we derive a bolometric luminosity of ⪆ 1034 erg s-1