Search Publications
HESS J1818-154, a new composite supernova remnant discovered in TeV gamma rays and X-rays
Klochkov, D.; Santangelo, A.; Quirrenbach, A. +217 more
Composite supernova remnants (SNRs) constitute a small subclass of the remnants of massive stellar explosions where non-thermal radiation is observed from both the expanding shell-like shock front and from a pulsar wind nebula (PWN) located inside of the SNR. These systems represent a unique evolutionary phase of SNRs where observations in the rad…
Imaging the circumstellar environment of the young T Tauri star SU Aurigae
Jeffers, S. V.; Min, M.; Canovas, H. +2 more
The circumstellar environments of classical T Tauri stars are challenging to directly image because of their high star-to-disk contrast ratio. One method to overcome this is by using imaging polarimetry where scattered and consequently polarised starlight from the star's circumstellar disk can be separated from the unpolarised light of the central…
Herschel observations of gas and dust in comet C/2006 W3 (Christensen) at 5 AU from the Sun
de Graauw, Th.; Lara, L. M.; Küppers, M. +19 more
Context. Cometary activity at large heliocentric distances is thought to be driven by outgassing of molecular species more volatile than water that are present in the nucleus. The long-period comet C/2006 W3 (Christensen) was an exceptional target for a detailed study of its distant gaseous and dust activity.
Aims: We aimed to measure the H
Suzaku study of gas properties along filaments of A2744
Zhang, Y. -Y.; Finoguenov, A.; Akamatsu, H. +2 more
Context. We present the results of Suzaku observations of a massive galaxy cluster
Aims: By using long X-ray observations of
Discovery of large-scale diffuse radio emission and of a new galaxy cluster in the surroundings of MACS J0520.7-1328
Pratt, G. W.; Bartalucci, I.; Kale, R. +11 more
We report the discovery of large-scale diffuse radio emission south-east of the galaxy cluster
Rest-frame ultraviolet spectra of massive galaxies at z ~ 3: evidence of high-velocity outflows
Almaini, Omar; Caputi, Karina I.; Trager, Scott C. +2 more
Galaxy formation models invoke the presence of strong feedback mechanisms that regulate the growth of massive galaxies at high redshifts. Providing observational evidence of these processes is crucial to justify and improve these prescriptions. In this paper we aim to (1) confirm spectroscopically the redshifts of a sample of massive galaxies sele…
Dusty shells surrounding the carbon variables S Scuti and RT Capricorni
Blommaert, J. A. D. L.; Ottensamer, R.; Decin, L. +8 more
For the Mass-loss of Evolved StarS (MESS) programme, the unprecedented spatial resolution of the PACS photometer on board the Herschel Space Observatory was employed to map the dusty environments of asymptotic giant branch (AGB) and red supergiant (RSG) stars. Among the morphologically heterogeneous sample, a small fraction of targets is enclosed …
Ionization toward the high-mass star-forming region NGC 6334 I
Ceccarelli, Cecilia; Lis, Dariusz C.; Olmi, Luca +3 more
Context. Ionization plays a central role in the gas-phase chemistry of molecular clouds. Since ions are coupled with magnetic fields, which can in turn counteract gravitational collapse, it is of paramount importance to measure their abundance in star-forming regions.
Aims: We use spectral line observations of the high-mass star-forming regio…
Anomalous flows in a sunspot penumbra
Venkatakrishnan, P.; Mathew, Shibu K.; Louis, Rohan E. +1 more
Context. The photospheric Evershed flow is a distinct characteristic of penumbrae that is closely associated with the photometric and magnetic structure of sunspots.
Aims: We analyse the properties of an anomalous flow in the photosphere in a sunspot penumbra and compare it with those of the regular Evershed flow.
Methods: High-resolutio…
Binary white dwarfs in the halo of the Milky Way
Toonen, Silvia; Brown, Anthony G. A.; Helmi, Amina +4 more
Aims: We study single and binary white dwarfs in the inner halo of the Milky Way in order to learn more about the conditions under which the population of halo stars was born, such as the initial mass function (IMF), the star formation history, or the binary fraction.
Methods: We simulate the evolution of low-metallicity halo stars at di…