Julia Alhvind: X-Ray Observations of Old Nearby Supernovae and Constraints on Compact Objects Population

Thursday 19 Feb 2026, 13:15 → 14:00 Europe/Stockholm

A5:1003 (AlbaNova Main Building)

The properties of compact objects formed in core-collapse supernovae (SNe) remain uncertain. X-ray observations years to decades after explosion provide a way to probe these young remnants, as hard emission from the central regions can emerge once the ejecta becomes sufficiently transparent. In this talk, I will present a systematic study of late-time X-ray emission from 242 nearby core-collapse SNe based on more than 600 archival observations. I will show new X-ray SN detections, highlight one case with a possible hard central component, and demonstrate how upper limits from the full sample can be used to constrain the young pulsar population.