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X-ray eruptions every 22 days from the nucleus of a nearby galaxy

Gendreau, Keith; van Velzen, Sjoert; Gezari, Suvi +15 more

Galactic nuclei showing recurrent phases of activity and quiescence have recently been discovered. Some have recurrence times as short as a few hours to a day and are known as quasi-periodic X-ray eruption (QPE) sources. Others have recurrence times as long as hundreds to a thousand days and are called repeating nuclear transients. Here we present…

Constraints on the dense matter equation of state from young and cold isolated neutron stars

Rea, N.; Marino, A.; Pons, J. A. +3 more

Neutron stars are the dense and highly magnetic relics of supernova explosions of massive stars. The quest to constrain the equation of state (EOS) of ultradense matter and thereby probe the behaviour of matter inside neutron stars is one of the core goals of modern physics and astrophysics. A promising method involves investigating the long-term …

X-ray detection of astrospheres around three main-sequence stars and their mass-loss rates

Güdel, M.; Koutroumpa, D.; Lisse, C. M. +3 more

Stellar winds of cool main-sequence stars are difficult to constrain observationally. One way to measure stellar mass-loss rates is to detect the soft X-ray emission from stellar astrospheres produced by charge exchange between heavy ions of the stellar wind and cold neutrals of the interstellar medium surrounding the stars. Here we report detecti…

The X-ray mysteries of neutron stars and white dwarfs

Rea, Nanda; Schartel, Norbert

These two types of compact objects share several similarities, despite their different compositions. A short workshop in Spain brought communities together to share understanding of dense matter under extreme conditions.