Federico A. Fogantini

Phase-resolved X-ray spectroscopy of the Vela pulsar with NICER observations

PSR J0835-4510 (the Vela pulsar) is the best studied pulsar in the southern hemisphere given its high radio brightness and large glitch activity. However, its X-ray brightness is lower, making the study of its X-ray profile difficult. We aim to investigate the X-ray emission of t...

JWST Reveals a Highly Ionized Nebula Powered by an Ultraluminous X-Ray Source with a Massive Black Hole in the Metal-poor Galaxy Holmberg II

Abstract Recent James Webb Space Telescope (JWST) observations have revealed fine-structure lines of ions with ionization potentials ≳50 eV, such as [Ne v ] and [O iv ], in nebular spectra of some low-metallicity galaxies, raising questions about the nature of the ionizing source...