Search Publications
The unaltered pulsar: GRO J1750-27, a supercritical X-ray neutron star that does not blink an eye
Altamirano, D.; Sanna, A.; Ducci, L. +11 more
When accreting X-ray pulsars (XRPs) undergo bright X-ray outbursts, their luminosity-dependent spectral and timing features can be analyzed in detail. The XRP GRO J1750-27 recently underwent one such episode, during which it was observed with NuSTAR and monitored with NICER. Such a data set is rarely available, as it samples the outburst over more…
A high-latitude coronal mass ejection observed by a constellation of coronagraphs: Solar Orbiter/Metis, STEREO-A/COR2, and SOHO/LASCO
Perri, S.; Sasso, C.; Romoli, M. +35 more
Context. A few days before the first perihelion of the Solar Orbiter nominal mission, which occurred on 2022 March 26, the Metis coronagraph on board Solar Orbiter detected a coronal mass ejection (CME) that was moving away from the far side of the Sun (with respect to Solar Orbiter) at high northern latitudes. The eruption was also seen by other …
C I and CO in nearby spiral galaxies. I. Line ratio and abundance variations at ∼200 pc scales
Kruijssen, J. M. Diederik; Rosolowsky, Erik; Chevance, Mélanie +25 more
We present new neutral atomic carbon [C I] (3P1 → 3P0) mapping observations within the inner ∼7 kpc and ∼4 kpc of the disks of NGC 3627 and NGC 4321 at a spatial resolution of 190 pc and 270 pc, respectively, using the Atacama Large Millimeter/Submillimeter Array (ALMA) Atacama Compact Array (ACA). We co…
UOCS. X. Rich collection of post-mass-transfer systems in NGC 6791
Jadhav, Vikrant V.; Subramaniam, Annapurni; Sagar, Ram
Aims: NGC 6791 is one of the richest old open clusters in the Milky Way. Its position above the Galactic plane and its number density make it an interesting middle ground between Galactic open and globular clusters. We aim to detect the UV-bright population of NGC 6791 using AstroSat/UVIT images in near-UV and far-UV filters and characterise …
Star-disk interactions in the strongly accreting T Tauri star S CrA N
Dougados, C.; Bouvier, J.; Alencar, S. H. P. +11 more
Context. Classical T Tauri stars are thought to accrete material from their surrounding protoplanetary disks through funnel flows along their magnetic field lines. The classical T Tauri stars with high accretion rates (∼10−7 M⊙ yr−1) are ideal targets for testing this magnetospheric accretion scenario in a sustaine…
Disc wind or disc line? The extraordinary Fe-K feature of Mrk 1513
Bianchi, S.; Braito, V.; Nardini, E. +4 more
We discuss the origin of a very unusual spectral structure observed in the Fe-K band of the Seyfert galaxy Mrk 1513, a local (z = 0.063) active galactic nucleus (AGN) that is efficiently accreting matter onto its central supermassive black hole (Lbol/LEdd ∼ 0.5). We consider the highest quality X-ray observation of this sourc…
The Lockman-SpReSO project. Description, target selection, observations, and catalogue preparation
Krongold, Yair; Gallego, Jesús; Sánchez-Portal, Miguel +26 more
Context. Extragalactic surveys are a key tool for better understanding the evolution of galaxies. Both deep and wide-field surveys serve to provide a clearer emerging picture of the physical processes that take place in and around galaxies, and to identify which of these processes are the most important in shaping the properties of galaxies.
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Gaia colour-magnitude diagrams of young open clusters. Identification in the UBC catalogue and comparison between manual and automated analyses
de Burgos, A.; Negueruela, I.
Context. Automated analyses of Gaia astrometric data have led to the discovery of many new high-quality open cluster candidates. When a good determination of their parameters is available, these objects become excellent tools for investigating the properties of our Galaxy.
Aims: We explore whether young open clusters can be readily identified…
NIRwave: A wave-turbulence-driven solar wind model constrained by PSP observations
Güdel, M.; Boro Saikia, S.; Bartel, M. +2 more
Aims: We generate a model description of the solar wind based on an explicit wave-turbulence-driven heating mechanism, and constrain our model with observational data.
Methods: We included an explicit coronal heating source term in the general 3D magnetohydrodynamic code NIRVANA to simulate the properties of the solar wind. The adapted h…
Five-minute oscillations of photospheric and chromospheric swirls
Liu, Jiajia; Mathioudakis, Mihalis; Erdélyi, Robert +1 more
Context. Swirls are ubiquitous in the solar atmosphere. They are thought to be related to the excitation of different modes of magnetohydrodynamic waves and pulses, as well as spicules. However, statistical studies of their collective behaviour are rare.
Aims: We aim to study the collective as well as the individual behaviour of photospheric …