Search Publications
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…
Photospheric downward plasma motions in the quiet Sun
Ruiz Cobo, B.; Quintero Noda, C.; Orozco Suárez, D.
Context. We analyze spectropolarimetric data taken with the Hinode spacecraft in quiet solar regions at the disk center. Distorted redshifted Stokes V profiles are found that show a characteristic evolution that always follows the same sequence of phases.
Aims: We aim to characterize the statistical properties of these events and recover the …
The Earliest Phases of Star formation (EPoS). Temperature, density, and kinematic structure of the star-forming core CB 17
Henning, Th.; Krause, O.; Beuther, H. +7 more
Context. The initial conditions for the gravitational collapse of molecular cloud cores and the subsequent birth of stars are still not well constrained. The characteristic cold temperatures (~10 K) in such regions require observations at sub-millimetre and longer wavelengths. The Herschel Space Observatory and complementary ground-based observati…
XMM-Newton and Swift observations of WZ Sagittae: spectral and timing analysis
Mukai, K.; Kuulkers, E.; Nucita, A. A. +3 more
Context. WZ Sagittae is the prototype object of a subclass of dwarf novae with rare and long (super)outbursts, in which a white dwarf primary accretes matter from a low mass companion. High-energy observations offer the possibility of a better understanding of the disk-accretion mechanism in WZ Sge-like binaries.
Aims: We used archival XMM-Ne…