Search Publications
Search strategies for supermassive stars in young clusters and application to nearby galaxies
Schaerer, D.; Marques-Chaves, R.; Usher, C. +4 more
Context. Supermassive stars (SMSs) with masses M ≳ 103 − 104 M⊙ formed by runaway collisions in young, massive, and dense star clusters have been invoked as a possible solution to the problem of the presence of multiple stellar populations and peculiar abundance patterns observed in globular clusters (GCs). However…
Langmuir waves associated with magnetic holes in the solar wind
André, M.; Maksimovic, M.; Souček, J. +6 more
Context. Langmuir waves (electrostatic waves near the electron plasma frequency) are often observed in the solar wind and may play a role in the energy dissipation of electrons. The largest amplitude Langmuir waves are typically associated with type II and III solar radio bursts and planetary foreshocks. In addition, Langmuir waves not related to …
Sapaki: Galactic O3If* star possibly born in isolation
Roman-Lopes, A.; Sanmartim, D.; Zarricueta Plaza, M. S.
Context. The study of high-mass stars found to be isolated in the field of the Milky Way may help to probe the feasibility of the core-accretion mechanism in the case of massive star formation. The existence of truly isolated stars may efficiently probe the possibility that individual massive stars can be born in isolation.
Aims: We observed …
The active CGCG 077-102 NED02 galaxy within the Abell 2063 galaxy cluster
Adami, C.; Lima Neto, G. B.; Ulmer, M. P. +3 more
Context. Within the framework of investigating the link between the central super massive black holes in the cores of galaxies and the galaxies themselves, we detected a variable X-ray source in the center of CGCG 077-102 NED02, which is a member of the CGCG 077-102 galaxy pair within the Abell 2063 cluster of galaxies.
Aims: Our goal is to c…
A runaway T Tauri star leaving an extended trail
Luque-Escamilla, Pedro L.; Martí, Josep; Sánchez-Ayaso, Estrella
Aims: We address the problem of young stellar objects that are found too far away from possible star formation sites. Different mechanisms have been proposed before to explain this unexpected circumstance. The idea of high-velocity protostars is one of these mechanisms, although observational support is not always easy to obtain. We aim to sh…
A redshifted excess in the broad emission lines after the flare of the γ-ray narrow-line Seyfert 1 PKS 2004−447
Wolf, C.; Marziani, P.; Berton, M. +6 more
PKS 2004−447 is a narrow-line Seyfert 1 (NLS1) harbouring a relativistic jet with γ-ray emission. On 2019 October 25, the Fermi-Large Area Telescope captured a γ-ray flare from this source, offering a chance to study the broad-line region (BLR) and jet during such violent events. This can provide insights into the BLR structure and jet interaction…
Euclid preparation. I. The Euclid Wide Survey
Aussel, H.; Cimatti, A.; Schultheis, M. +242 more
Euclid is a mission of the European Space Agency that is designed to constrain the properties of dark energy and gravity via weak gravitational lensing and galaxy clustering. It will carry out a wide area imaging and spectroscopy survey (the Euclid Wide Survey: EWS) in visible and near-infrared bands, covering approximately 15 000 deg2 …
The LOFAR Two-metre Sky Survey. V. Second data release
Prandoni, I.; Zhang, X.; Di Gennaro, G. +103 more
In this data release from the ongoing LOw-Frequency ARray (LOFAR) Two-metre Sky Survey we present 120-168 MHz images covering 27% of the northern sky. Our coverage is split into two regions centred at approximately 12h45m +44°30' and 1h00m +28°00' and spanning 4178 and 1457 square degrees respectively. The images were derived from 3451 h (7.6 PB) …
The eROSITA Final Equatorial Depth Survey (eFEDS). X-ray catalogue
Finoguenov, A.; Haberl, F.; Schrabback, T. +35 more
Context. The eROSITA X-ray telescope on board the Spectrum-Poentgen-Gamma (SPG) observatory combines a large field of view and a large collecting area in the energy range between ~0.2 and ~8.0 keV. This gives the telescope the capability to perform uniform scanning observations of large sky areas.
Aims: SRG/eROSITA performed scanning observat…
The PHANGS-MUSE survey. Probing the chemo-dynamical evolution of disc galaxies
Sandstrom, Karin M.; Henshaw, Jonathan D.; Kruijssen, J. M. Diederik +45 more
We present the PHANGS-MUSE survey, a programme that uses the MUSE integral field spectrograph at the ESO VLT to map 19 massive (9.4 < log(M⋆/M⊙)< 11.0) nearby (D ≲ 20 Mpc) star-forming disc galaxies. The survey consists of 168 MUSE pointings (1' by 1' each) and a total of nearly 15 × 106 spectra, covering ∼1.…