Search Publications
The X-ray properties of z > 6 quasars: no evident evolution of accretion physics in the first Gyr of the Universe
Bauer, F. E.; Brandt, W. N.; Vignali, C. +10 more
Context. X-ray emission from quasars (QSOs) has been used to assess supermassive black hole accretion properties up to z ≈ 6. However, at z > 6 only ≈15 QSOs are covered by sensitive X-ray observations, preventing a statistically significant investigation of the X-ray properties of the QSO population in the first Gyr of the Universe.
Aims:…
Expanding associations in the Vela-Puppis region. 3D structure and kinematics of the young population
Jordi, C.; Cantat-Gaudin, T.; Balaguer-Núñez, L. +9 more
Context. The Vela-Puppis region is known to host the Vela OB2 association as well as several young clusters featuring OB and pre-main-sequence stars. Several spatial and kinematic subgroups have been identified in recent years.
Aims: By grouping stars based on their positions and velocity, we can address the question of the dynamical history …
Extended stellar systems in the solar neighborhood . II. Discovery of a nearby 120° stellar stream in Gaia DR2
Meingast, Stefan; Alves, João; Fürnkranz, Verena
We report the discovery of a large, dynamically cold, coeval stellar stream that is currently traversing the immediate solar neighborhood at a distance of only 100 pc. The structure was identified in a wavelet decomposition of the 3D velocity space of all stars within 300 pc of the Sun. Its members form a highly elongated structure with a length o…
Long-term monitoring of the outgassing and composition of comet 67P/Churyumov-Gerasimenko with the Rosetta/MIRO instrument
Hartogh, P.; Lellouch, E.; Crovisier, J. +14 more
We present the analysis of ≈100 molecular maps of the coma of comet 67P/Churyumov-Gerasimenko that were obtained with the MIRO submillimeter radiotelescope on board the Rosetta spacecraft. From the spectral line mapping of H216O, H218O, H217O, CH3OH, NH3, and C…
The 3HSP catalogue of extreme and high-synchrotron peaked blazars
Giommi, P.; Padovani, P.; Chang, Y. -L. +2 more
Aims: High-synchrotron peaked blazars (HSPs or HBLs) play a central role in very high-energy (VHE) γ-ray astronomy, and likely in neutrino astronomy. Currently, the largest compilation of HSP blazars, the 2WHSP sample, includes 1691 sources, but it is not complete in the radio or in the X-ray band. In order to provide a larger and more accura…
SIXTE: a generic X-ray instrument simulation toolkit
Wilms, Jörn; Dauser, Thomas; Falkner, Sebastian +8 more
We give an overview of the SImulation of X-ray TElescopes (SIXTE) software package, a generic, mission-independent Monte Carlo simulation toolkit for X-ray astronomical instrumentation. The package is based on a modular approach for the source definition, the description of the optics, and the detector type such that new missions can be easily imp…
Highly luminous supernovae associated with gamma-ray bursts. I. GRB 111209A/SN 2011kl in the context of stripped-envelope and superluminous supernovae
Pian, E.; Greiner, J.; Klose, S. +22 more
Context. GRB 111209A, one of the longest gamma-ray bursts (GRBs) ever observed, is linked to SN 2011kl, which is the most luminous GRB supernova (SN) detected so far. Several lines of evidence indicate that this GRB-SN is powered by a magnetar central engine.
Aims: We place SN 2011kl into the context of large samples of SNe, addressing in mor…
Strong lensing models of eight CLASH clusters from extensive spectroscopy: Accurate total mass reconstructions in the cores
Demarco, R.; Zitrin, A.; Grillo, C. +19 more
We carried out a detailed strong lensing analysis of a sub-sample of eight galaxy clusters of the Cluster Lensing And Supernova survey with Hubble (CLASH) in the redshift range of zcluster = [0.23 - 0.59] using extensive spectroscopic information, primarily from the Multi Unit Spectroscopic Explorer (MUSE) archival data and complemented…
Stellar population of Sco OB2 revealed by Gaia DR2 data
Micela, G.; Sciortino, S.; Pillitteri, I. +2 more
Context. The Sco OB2 association is the nearest OB association, extending over approximately 2000 square degrees on the sky. Only its brightest and most massive members are already known (from HIPPARCOS) across its entire size, while studies of its lower mass population refer only to small portions of its extent.
Aims: In this work we exploit…
Barium and related stars, and their white-dwarf companions. I. Giant stars
Jorissen, A.; Escorza, A.; Boffin, H. M. J. +4 more
Context. Barium and S stars without technetium are red giants and are suspected of being members of binary systems due to their overabundances in heavy elements. These elements are produced by the s-process of nucleosynthesis, despite the stars not being evolved enough to be able to activate the s-process in their interiors. A companion formerly o…