We present very deep near-infrared imaging in the Js, H and Ks-bands of the HDF-S and the field around the z=0.83 cluster MS1054-03 with ISAAC on the VLT. For the HDF-S this resulted in the deepest ground-based infrared observations to date and the deepest Ks-band in any field. We constructed Ks-selected multicolor catalogs in both fields

Ground based and HST imaging of quasars (see, e.g., Dunlop et al. 2003; Pagani et al. 2003 and references therein) clearly indicate that at z 0.5 quasars are hosted in massive galaxies dominated by the spheroidal component. While radio loud quasars (RLQ) are exclusively hosted by ellipticals exceeding by 2-3 mag L*, radio quiet quasars (RQQ) are

We want to test the observed type I X-ray burst behaviour of the bright ultra-compact binary system 4U 1820-30 with evolutionary and burst models. The short orbital period suggests that the companion white dwarf is hydrogen deficient, with evolutionary models predicting a composition of either pure helium or a small amount of hydrogen (~5-35% by

We present deep IJHK_s and H_2 images of a region in the Chamaeleon I dark cloud containing the very low-mass young object [KG2001]102, in an attempt to search for multiplicity and molecular outflows in the vicinity of this object. No low-velocity shocked structures were detected on our H_2 image. The broad-band and narrow-band images show that

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Beamswitch experiments located at Teide Observatory, Tenerife operate at 10, 15, 33 GHz. An area of ˜1 steradian has been covered at angular scales from 5 to 20 degrees ( l=10-30 ) . Sensitivity is ˜10 μ K per beam area at 15 and 33 GHz and 26 μ K at 10 GHz which gives a measure of the CMB fluctuation amplitude to 10 %. These data have been used to