Search Publications
Synthesis of radioactive elements in novae and supernovae and their use as a diagnostic tool
Hernanz, M.; Siegert, T.; Vink, J. +5 more
Novae and supernovae play a key role in many fields of Astrophysics and Cosmology. Despite their importance, an accurate description of which objects explode and why and how they explode is still lacking. One of the main characteristics of such explosions is that they are the main suppliers of newly synthesized chemical elements in the Galaxy. Sin…
Pitch-angle distribution of accelerated electrons in 3D current sheets with magnetic islands
Zharkova, V.; Xia, Q.
Aims: This research aims to explore variations of electron pitch-angle distributions (PADs) during spacecraft crossing of reconnecting current sheets (RCSs) with magnetic islands. Our results can benchmark the sampled characteristic features with realistic PADs derived from in situ observations.
Methods: Particle motion is simulated in 2…
Planetary nebulae with UVIT: A progress report
Rao, N. Kameswara; Sutaria, F.; Murthy, J. +2 more
The spectral region between 1250–3000
Testing the predictions of axisymmetric distribution functions of galactic dark matter with hydrodynamical simulations
Lavalle, Julien; Petač, Mihael; Núñez-Castiñeyra, Arturo +1 more
Signal predictions for galactic dark matter (DM) searches often rely on assumptions regarding the DM phase-space distribution function (DF) in halos. This applies to both particle (e.g. p-wave suppressed or Sommerfeld-enhanced annihilation, scattering off atoms, etc.) and macroscopic DM candidates (e.g. microlensing of primordial black holes). As …
Stellar wind structures in the eclipsing binary system IGR J18027-2016
García, Federico; Fogantini, Federico A.; Chaty, Sylvain +1 more
Context. IGR J18027-2016 is an obscured high-mass X-ray binary formed by a neutron star accreting from the wind of a supergiant companion with a ∼4.57 d orbital period. The source shows an asymmetric eclipse profile that remained stable across several years.
Aims: We aim to investigate the geometrical and physical properties of stellar wind s…
Some Features of Solar Proton Events on March 7, 2011, and on February 20, 2014
Vlasova, N. A.; Kalegaev, V. V.; Tulupov, V. I.
The paper presents the results of studying two solar proton events—on March 7, 2011, and on February 20, 2014—which are associated with solar flares having almost the same power and located at close heliolongitudes, on the western side of the solar disk. The work was done on the basis of the experimental data obtained from the ACE spacecraft and t…
A Uniform Series of Low-Latitude Coronal Holes in 1973-2018
Asikainen, T.; Mursula, K.; Hamada, A.
Coronal holes (CHs) are regions in the solar corona characterized by plasma density lower than in the surrounding quiet Sun. Therefore they appear dark in images of the solar atmosphere made, e.g., in extreme ultraviolet (EUV). Identifying CHs on solar images is difficult since CH boundaries are not sharp, but typically obscured by magnetic struct…
The study of runaway candidate stars in the 30 Doradus region: Using Gaia DR2 data
Gebrehiwot, Yikdem Mengesha; Teklehaimanot, Berhe Tewelde
We explore the Gaia DR2 relative proper motions of seven young, massive, OB type runaway candidate stars presented by Platais et al. (2018) in the 30 Doradus (30 Dor) region of the Large Magellanic Cloud (LMC). The stars are slow runaways in the tangential plane of the 30 Dor region with relative proper motions µ ≤ 0.4 mas yr-1 th…
Light-toned deposit in the northeastern Hellas basin formed by terrain-conforming airfall sedimentation
Wilson, S. A.; Howard, A. D.; Morgan, A. M. +2 more
Extensive exposures of a light-toned deposit (LTD) occurs on the northeastern interior slope of the Hellas basin. This deposit is on the floors of all but the youngest craters greater than 30 km in diameter in the study region centered at 83°E and 30°S, as well as in exposures on crater interior and exterior walls, on intercrater plains, and the n…
Study of central intensity ratio of early-type galaxies from low-density environment
Ravikumar, C. D.; Sruthi, K.
We present correlations involving central intensity ratio (CIR) of 52 early-type galaxies, including 24 ellipticals and 28 lenticulars, selected from low-density environment in the nearby (<30 Mpc) universe. CIR is found to be negatively and significantly correlated with the mass of the central supermassive black hole, central velocity dispersi…