Search Publications
Spontaneous formation of dipolarization fronts and reconnection onset in the magnetotail
Merkin, V. G.; Sitnov, M. I.; Moore, T. E. +2 more
We present full-particle simulations of 2-D magnetotail current sheet equilibria with open boundaries and zero driving. The simulations show that spontaneous formation of dipolarization fronts and subsequent formation of magnetic islands are possible in equilibria with an accumulation of magnetic flux at the tailward end of a sufficiently thin cur…
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…
An Extremely Luminous and Variable Ultraluminous X-Ray Source in the Outskirts of Circinus Observed with NuSTAR
Ptak, A.; Harrison, F.; Stern, D. +16 more
Following a serendipitous detection with the Nuclear Spectroscopic Telescope Array (NuSTAR), we present a multi-epoch spectral and temporal analysis of an extreme ultraluminous X-ray source (ULX) located in the outskirts of the Circinus galaxy, hereafter Circinus ULX5, including coordinated XMM-Newton+NuSTAR follow-up observations. The NuSTAR data…
Traces of Past Activity in the Galactic Centre
Morris, Mark R.; Goldwurm, Andrea; Ponti, Gabriele +1 more
The Milky Way centre hosts a supermassive Black Hole (BH) with a mass of ∼ 4 × 1{0}6 M_{⊙}. Sgr A∗, its electromagnetic counterpart, currently appears as an extremely weak source with a luminosity L∼10-9LEdd. The lowest known Eddington ratio BH. However, it was not always so; traces of "glorious" active …
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 …
Measurements and simulation of Faraday rotation across the Coma radio relic
Vazza, F.; Bonafede, A.; Govoni, F. +5 more
The aim of this work is to probe the magnetic field properties in relics and infall regions of galaxy clusters using Faraday rotation measures. We present Very Large Array multifrequency observations of seven sources in the region south-west of the Coma cluster, where the infalling group NGC 4839 and the relic 1253+275 are located. The Faraday rot…
Mid-infrared Determination of Total Infrared Luminosity and Star Formation Rates of Local and High-redshift Galaxies
Kartaltepe, J. S.; Rujopakarn, W.; Rieke, G. H. +4 more
We demonstrate estimating the total infrared luminosity, L(TIR), and star formation rates (SFRs) of star-forming galaxies at redshift 0 < z < 2.8 from single-band 24 µm observations, using local spectral energy distribution (SED) templates without introducing additional free parameters. Our method is based on characterizing the SEDs 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