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Pushing the frontiers of gravitational encounters and collisionless dynamics Abstract The long range nature of gravity complicates the dynamics of self-gravitating many-body systems such as galaxies and dark matter (DM) halos. Relaxation/equilibration of perturbed galaxies and cold dark...
Understanding the nature of Partially Screened Gap in Pulsars from Subpulse Drifting Abstract The radio emission from pulsars is expected to arise as a result of instabilities developing in a non-stationary plasma moving along the open magnetic field lines. The out-flowing plasma is setup...
Inferring dark matter halo properties for HI-selected galaxies Abstract An important test of LCDM is the degree of consistency between dark matter halo properties measured using galaxy kinematics and their cosmologically expected values. Due to the observational expense in obtaining resolved...
Some ideas on a fermionic origin of MOND and CDM Abstract Current observations point to a bifurcation of theories of structure formation; below cluster scale there’s no real evidence for CDM once allowing for uncertainty of gravity theory; and above cluster scale it is still easiest to...
Implications of gravitational wave detections for stellar astrophysics and feedback Abstract Stars with masses much higher than our Sun end their short lives in a gravitational collapse, leaving behind neutron stars and black holes. The detections of gravitational waves (GW) brought...
Philolaos of Croton: Cosmos and harmony Abstract The astronomical system of Philolaos is a speculative construction that has deeply influenced modern thinkers. Yet, reconstructing Philolaos' scientific proposals involves manipulating fragmentary literary data that must be interpreted and...
The LOFAR window on the multiphase and magnetized Galaxy: insights from the MUSICA project Abstract Radio observations are a unique window to explore the mystery of cosmic magnetism, from the Galaxy to cosmological ages. By tracing synchrotron emission below 200 MHz with unprecedented...
First light of modern X-ray polarimetry Abstract December 9, 2021 marks the date of the launch of the very first modern X-ray polarimeter, more than 40 years after the OSO-8 mission. IXPE (Imaging X-ray Polarimetry Explorer) has just opened a new window in high energy astronomy, adding...
A global picture of the epoch of reionisation Abstract About a million years after the Big Bang, the Epoch of Reionisation sees the first light sources in the Universe slowly ionise the atoms of the surrounding IGM. Learning about this distant epoch has the potential of unveiling crucial...
The renaissance of globular clusters: old stellar systems for new dynamical questions Abstract The traditional picture of globular clusters (GCs) as old simple stellar systems is being radically revolutionized by groundbreaking observational programs such as Gaia and by extensive...