Search Publications
Interplay between Kelvin-Helmholtz and lower-hybrid drift instabilities
Henri, Pierre; Pucci, Francesco; Lavorenti, Federico +3 more
Boundary layers in space and astrophysical plasmas are the location of complex dynamics where different mechanisms coexist and compete, eventually leading to plasma mixing. In this work, we present fully kinetic particle-in-cell simulations of different boundary layers characterized by the following main ingredients: a velocity shear, a density gr…
A new possible accretion scenario for ultra-luminous X-ray sources
Makishima, K.; Nakazawa, K.; Kobayashi, Shogo B.
Using archival data from Suzaku, XMM-Newton, and NuSTAR, nine representative ultra-luminous X-ray sources (ULXs) in nearby galaxies were studied. Their X-ray spectra were all reproduced with a multicolour disc emission model plus its Comptonization. However, the spectral shapes of individual sources changed systematically depending on the luminosi…
Evidence for bimodal orbital separations of white dwarf-red dwarf binary stars
Gänsicke, B. T.; Marsh, T. R.; Ashley, R. P. +2 more
We present the results of a radial velocity survey of 20 white dwarf plus M dwarf binaries selected as a follow up to a Hubble Space Telescope study that aimed to spatially resolve suspected binaries. Our candidates are taken from the list of targets that were spatially unresolved with Hubble. We have determined the orbital periods for 16 of these…
Flattened loose particles from numerical simulations compared to particles collected by Rosetta
Lasue, J.; Bentley, M. S.; Merouane, S. +5 more
Context. Cometary dust particles are remnants of the primordial accretion of refractory material that occurred during the initial formation stages of the solar system. Understanding their physical structure can help constrain their accretion process.
Aims: The in situ study of dust particles that were collected at slow speeds by instruments o…
Transition Region Loops in the Very Late Phase of Flux Emergence in IRIS Sit-and-stare Observations
Fu, Hui; Li, Bo; Xia, Lidong +3 more
Loops are one of the fundamental structures that trace the geometry of the magnetic field in the solar atmosphere. Their evolution and dynamics provide a crucial proxy for studying how the magnetized structures are formed and heated in the solar atmosphere. Here, we report on spectroscopic observations of a set of transition-region loops taken by …
A population of high-velocity absorption-line systems residing in the Local Group
Fechner, C.; Richter, P.; Bouma, S. J. D.
Aims: We investigated the ionisation conditions and distances of Galactic high-velocity clouds (HVCs) in the Galactic halo and beyond in the direction of the Local Group (LG) barycentre and anti-barycentre, by studying spectral data of 29 extragalactic background sources obtained with the Cosmic Origins Spectropgraph (COS) installed on the Hu…
An Hα Imaging Survey of All (Ultra)luminous Infrared Galaxies at Decl. ≥ -30° in the GOALS Sample
Wu, Hong; Cao, Chen; Jin, Jun-Jie +5 more
This paper presents the result of Hα imaging for luminous and ultraluminous infrared galaxies. It is a complete subsample of the Great Observatories All-sky LIRG Survey (GOALS) with decl. ≥ -30°, and consists of 148 galaxies with log(L IR/L ⊙) ≥ 11.0. All the Hα images were carried out using the 2.16 m telescope at the Xinglo…
Growth and disruption in the Lyra complex
Brunetti, G.; Rossetti, M.; Molendi, S. +16 more
Context. Nearby clusters of galaxies, z ≲ 0.1, are cosmic structures still under formation. Understanding the thermodynamic properties of merging clusters can provide crucial information on how they grow in the local universe.
Aims: A detailed study of the intra-cluster medium (ICM) properties of un-relaxed systems is essential to understand …
Chandra Detection of Intracluster X-Ray Sources in Fornax
Jin, Xiangyu; Li, Zhiyuan; Hou, Meicun +1 more
Based on archival Chandra observations with a total exposure of 1.3 Ms, we study X-ray point sources in the Fornax cluster of galaxies, with the primary aim of searching for intracluster X-ray source populations. We detect 1177 point sources out to a projected radius of ∼30 arcmin (∼180 kpc) from the cluster center and down to a limiting 0.5-8 keV…
The GALANTE photometric system
Lennon, D. J.; García-Lario, P.; Maíz Apellániz, J. +9 more
This paper describes the characterization of the GALANTE photometric system, a seven intermediate- and narrow-band filter system with a wavelength coverage from 3000 Å to 9000 Å. We describe the photometric system presenting the full sensitivity curve as a product of the filter sensitivity, CCD, telescope mirror, and atmospheric transmission curve…