Search Publications
Probing the megaparsec-scale environment of hyperluminous infrared galaxies at 2 < z < 4
Wang, L.; Farrah, D.; Clements, D. +3 more
Context. Protoclusters are progenitors of galaxy clusters and they serve as an important key in studies of how halo mass and stellar mass assemble in the early universe. Finding the signposts of such overdense regions, such as bright dusty star-forming galaxies (DSFG), is a popular method for identifying protocluster candidates.
Aims: Hyperlu…
GRB 190919B: Rapid optical rise explained as a flaring activity
Karpov, Sergey; Hu, Y. -D.; Castro-Tirado, Alberto J. +17 more
Following the detection of a long GRB 190919B by INTEGRAL (INTErnational Gamma-Ray Astrophysics Laboratory), we obtained an optical photometric sequence of its optical counterpart. The light curve of the optical emission exhibits an unusually steep rise ∼100 s after the initial trigger. This behaviour is not expected from a `canonical' GRB optical…
Probing the innermost region of the AU Microscopii debris disc
Milli, J.; Boccaletti, A.; Girard, J. H. +5 more
Context. AU Mic is a young and nearby M-dwarf star harbouring a circumstellar debris disc and one recently discovered planet on an eight-day orbit. Large-scale structures within the disc were also discovered and are moving outwards at high velocity.
Aims: We aim to study this system with the highest spatial resolution in order to probe the in…
Probing the shape of the Milky Way dark matter halo with hypervelocity stars: A new method
Gallo, Arianna; Ostorero, Luisa; Chakrabarty, Sankha Subhra +2 more
We propose a new method for determining the shape of the gravitational potential of the dark matter (DM) halo of the Milky Way (MW) with the galactocentric tangential velocities of a sample of hypervelocity stars (HVSs). We compute the trajectories of different samples of HVSs in a MW where the baryon distribution is axisymmetric and the DM potent…
Catalogue of stars measured in the Geneva seven-colour photometric system
Paunzen, E.
Context. The Geneva seven-colour photometric system is successfully applied to the study of various astrophysical objects. It measures the slope of the Paschen continuum, the Balmer discontinuity, and blocking absorption due to hydrogen or metallic lines. One of its greatest strengths is its intrinsic homogeneity.
Aims: A new catalogue of the…
Dust emissivity in resolved spiral galaxies
Clark, Christopher J. R.; De Looze, Ilse; Baes, Maarten +12 more
Context. The far-infrared (FIR) and sub-millimeter (submm) emissivity, ϵν, of the Milky Way (MW) cirrus is an important benchmark for dust grain models. Dust masses in other galaxies are generally derived from the FIR/submm using the emission properties of these MW-calibrated models.
Aims: We seek to derive the FIR/submm ϵν
The binary system of the spinning-top Be star Achernar
Klement, Robert; Rivinius, Thomas; Mérand, Antoine +16 more
Context. Achernar, the closest and brightest classical Be star, presents rotational flattening, gravity darkening, occasional emission lines due to a gaseous disk, and an extended polar wind. It is also a member of a close binary system with an early A-type dwarf companion.
Aims: We aim to determine the orbital parameters of the Achernar syst…
Dust scattering halo around the CCO in HESS J1731-347: A detailed analysis
Pühlhofer, G.; Doroshenko, V.; Landstorfer, A.
The supernova remnant (SNR) HESS J1731−347 is one of the few objects exhibiting emission up to the TeV energy band and it stands as a prime target for the study of cosmic ray acceleration in SNRs. It also hosts a central compact object (CCO), which is of interest in the context of the ultra-dense matter equation of state in neutron stars. For both…
Sudden depletion of Alfvénic turbulence in the rarefaction region of corotating solar wind high-speed streams at 1 AU: Possible solar origin?
Pietropaolo, E.; Bruno, R.; Marino, R. +2 more
A canonical description of a corotating solar wind high-speed stream in terms of velocity profile would indicate three main regions: a stream interface or corotating interaction region characterized by a rapid increase in flow speed and by compressive phenomena that are due to dynamical interaction between the fast wind flow and the slower ambient…
Recent star formation history of the dwarf irregular galaxy Leo A
Stonkutė, Rima; Vansevičius, Vladas; Leščinskaitė, Alina
Context.