Motivated by misaligned discs observed in eccentric orbit Be/X-ray binaries, we examine the evolution of a retrograde disc around one component of an eccentric binary with hydrodynamic simulations, n -body simulations, and linear theory. Forced eccentricity growth from the eccentric orbit binary ...

In this Letter, we shed light on the evolutionary phase of HD 144812, a Galactic yellow supergiant showing infrared excess that is typically expected for evolved stars undergoing enhanced mass-loss activity. We present high-resolution spectroscopy of the star in the $H-$ and $K-$ band acquired with ...

Changing-look active galactic nucleus Mkn 590 recently underwent a sudden ‘re-ignition’, marked by substantial increases in optical/ultravilolet (UV) and X-ray continuum flux since last couple of years. Swift -XRT observations revealed the re-emergence of a soft X-ray excess as the source ...

We report measurements of the linear polarization degree (PD) and angle (PA) for hard X-ray emission from the Crab pulsar and wind nebula. Measurements were made with the XL-Calibur ( $\sim$ 15–80 keV) balloon-borne Compton-scattering polarimeter in July 2024. The polarization parameters are ...

The baryonic fraction of galaxies is observed to vary with the mass of their dark matter (DM) halo. Low-mass galaxies have low baryonic fractions that increase to a maximum for masses near $10^{12}\ {\rm M}_\odot$ , and decrease thereafter with increasing galaxy mass. This trend is generally ...

Long gamma-ray bursts (LGRBs) are typically thought to result from the collapse of massive stars. None the less, recent observations of gamma-ray bursts (GRBs) 211211A and 230307A, coupled with the low-redshift excess of LGRB event rates relative to star formation rates, present significant ...

We combine parallax distances to nearby O stars with parsec-scale resolution three-dimensional dust maps of the local region of the Milky Way (within 1.25 kpc of the Sun) to simulate the transfer of Lyman continuum photons through the interstellar medium (ISM). Assuming a fixed gas-to-dust ratio, ...

Recent JWST observations have allowed for the first time to obtain comprehensive measurements of the ionizing photon production efficiency $\xi _\text{ion}$ for a wide range of reionization-epoch galaxies. We explore implications for the inferred UV luminosity functions and escape fractions of ...