Search Publications
The Extended GMRT Radio Halo Survey. I. New upper limits on radio halos and mini-halos
Brunetti, G.; Kale, R.; Giacintucci, S. +5 more
Context. A fraction of galaxy clusters host diffuse radio sources called radio halos, radio relics and mini-halos. These are associated with the relativistic electrons and magnetic fields present on ~Mpc scales in the intra-cluster medium.
Aims: We aim to carry out a systematic radio survey of all luminous galaxy clusters selected from the RE…
Structure of sunspot penumbral filaments: a remarkable uniformity of properties
Lagg, Andreas; Solanki, Sami K.; Tiwari, Sanjiv Kumar +1 more
Context. The sunspot penumbra comprises numerous thin, radially elongated filaments that are central for heat transport within the penumbra, but whose structure is still not clear.
Aims: We aim to investigate the fine-scale structure of these penumbral filaments.
Methods: We perform a depth-dependent inversion of spectropolarimetric data…
VLT/VIMOS integral field spectroscopy of luminous and ultraluminous infrared galaxies: 2D kinematic properties
Arribas, Santiago; Colina, Luis; Bellocchi, Enrica +1 more
Context. (Ultra) Luminous infrared galaxies [(U)LIRGs] host the most extreme star-forming events in the present universe and are places where a significant fraction of the past star formation beyond z ~ 1 has occurred. The kinematic characterization of this population is important to constrain the processes that govern such events.
Aims: We p…
The Herschel view of the massive star-forming region NGC 6334
Martin, P. G.; Hill, T.; Roussel, H. +30 more
Aims: Fundamental to any theory of high-mass star formation are gravity and turbulence. Their relative importance, which probably changes during cloud evolution, is not known. By investigating the spatial and density structure of the high-mass star-forming complex NGC 6334 we aim to disentangle the contributions of turbulence and gravity.
Abell 2142 at large scales: An extreme case for sloshing?
Rossetti, M.; Molendi, S.; De Grandi, S. +4 more
We present results obtained with a new XMM-Newton observation of A2142, a textbook example of a cluster with multiple cold fronts, which has been studied in detail with Chandra but whose large scale properties are presented here for the first time. We report the discovery of a new cold front, the most distant one ever detected in a galaxy cluster,…
First stars. XVI. HST/STIS abundances of heavy elements in the uranium-rich metal-poor star CS 31082-001
Bonifacio, P.; Caffau, E.; Spite, M. +14 more
Context. The origin and site(s) of the r-process nucleosynthesis is(are) still not known with certainty, but complete, detailed r-element abundances offer our best clues. The few extremely metal-poor (EMP) stars with large r-element excesses allow us to study the r-process signatures in great detail, with minimal interference from later stages of …
H2O emission in high-z ultra-luminous infrared galaxies
Omont, A.; Fritz, J.; Bock, J. +47 more
Using the IRAM Plateau de Bure interferometer (PdBI), we report the detection of water vapor in six new lensed ultra-luminous starburst galaxies at high redshift, discovered in the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). The sources are detected either in the 202-111 or 211-202 H
A comprehensive picture of baryons in groups and clusters of galaxies
Zhang, Y. -Y.; Martinet, N.; Durret, F. +3 more
Aims: Based on XMM-Newton, Chandra, and SDSS data, we investigate the baryon distribution in groups and clusters and its use as a cosmological constraint. For this, we considered a sample of 123 systems with temperatures kT500 = 1.0-9.0 keV, total masses in the mass range M500 = (~1013-4 × 1015)h
The XMM-Newton survey of the Small Magellanic Cloud: The X-ray point-source catalogue
Pietsch, W.; Haberl, F.; Hatzidimitriou, D. +8 more
Context. Local-Group galaxies provide access to samples of X-ray source populations of whole galaxies. The XMM-Newton survey of the Small Magellanic Cloud (SMC) completely covers the bar and eastern wing with a 5.6 deg2 area in the (0.2-12.0) keV band.
Aims: To characterise the X-ray sources in the SMC field, we created a catalogue…
The chemistry of ions in the Orion Bar I. - CH+, SH+, and CF+. The effect of high electron density and vibrationally excited H2 in a warm PDR surface
Le Bourlot, J.; Le Petit, F.; Ossenkopf, V. +8 more
Context. The abundances of interstellar CH+ and SH+ are not well understood as their most likely formation channels are highly endothermic. Several mechanisms have been proposed to overcome the high activation barriers, including shocks, turbulence, and H2 vibrational excitation.
Aims: Using data from the Hers…