Search Publications
A highly-ionized absorber in the X-ray binary 4U 1323-62: A new explanation for the dipping phenomenon
Kaastra, J. S.; Díaz Trigo, M.; Parmar, A. N. +2 more
We report the detection of narrow Fe XXV and Fe XXVI X-ray absorption lines at 6.68 ± 0.04 keV and 6.97 ± 0.05 keV in the persistent emission of the dipping low-mass X-ray binary 4U 1323-62 during a 2003 January XMM-Newton observation. These features are superposed on a broad emission feature centered on 6.6 +0.1-0.2 keV. Dur…
The first observed stellar X-ray flare oscillation: Constraints on the flare loop length and the magnetic field
Mitra-Kraev, U.; Harra, L. K.; Williams, D. R. +1 more
We present the first X-ray observation of an oscillation during a stellar flare. The flare occurred on the active M-type dwarf
Size distribution of circumstellar disks in the Trapezium cluster
Alves, J.; Vicente, S. M.
In this paper we present results on the size distribution of circumstellar disks in the
Jet rotation: Launching region, angular momentum balance and magnetic properties in the bipolar outflow from RW Aur
Ray, T. P.; Eislöffel, J.; Marconi, A. +3 more
Using STIS on board the HST we have obtained a spectroscopic map of the bipolar jet from
High-speed coronal rain
Peter, H.; Hansteen, V. H.; De Groof, A. +1 more
At high spatial and temporal resolution, coronal loops are observed to have a highly dynamic nature. Recent observations with SOHO and TRACE frequently show localized brightenings "raining" down towards the solar surface. What is the origin of these features? Here we present for the first time a comparison of observed intensity enhancements from a…
Dust-enshrouded giants in clusters in the Magellanic Clouds
van Loon, J. Th.; Zijlstra, A. A.; Marshall, J. R.
We present the results of an investigation of post-Main Sequence mass loss from stars in clusters in the Magellanic Clouds, based around an imaging survey in the L'-band (3.8 µm) performed with the VLT at ESO. The data are complemented with JHKs (ESO and 2MASS) and mid-IR photometry (TIMMI2 at ESO, ISOCAM on-board ISO, and data fr…
Star-formation in NGC 4038/4039 from broad and narrow band photometry: cluster destruction?
Genzel, R.; Lehnert, M. D.; Mengel, S. +1 more
Accurately determining the star formation history in NGC 4038/4039 - "The Antennae" - is hampered by variable and sometimes substantial extinction. We therefore used near infrared broad- and narrow-band images obtained with ISAAC at the VLT and with SOFI at the NTT to determine the recent star formation history in this prototypical merger. In comb…
XMM-Newton observations of Extremely Red Objects and the link with luminous, X-ray obscured quasars
Cimatti, A.; Daddi, E.; Fiore, F. +8 more
We present the results of a deep (about 80 ks) XMM-Newton survey of the largest sample of near-infrared selected Extremely Red Objects (R-K> 5) available to date to KS⪉ 19.2. At the relatively bright X-ray fluxes (F2-10 keV⪆ 4× 10-15 erg cm-2 s-1) and near-infrared magnitude probed by the p…
The star cluster population of M 51. III. Cluster disruption and formation history
Bastian, N.; Gieles, M.; Lamers, H. J. G. L. M. +1 more
In this work we concentrate on the evolution of the cluster population of the interacting galaxy M 51 (NGC 5194), more precisely the timescale of cluster disruption and possible variations in the cluster formation rate. We present a method to compare observed age vs. mass number density diagrams with predicted populations including various physica…
An XMM-Newton survey of M 31
Pietsch, W.; Haberl, F.; Freyberg, M.
In an analysis of XMM-Newton archival observations of the bright Local Group spiral galaxy