XMM/HST monitoring of the ultra-soft highly accreting Narrow Line Seyfert 1 RBS 1332

R. Middei, S. Barnier, F. G. Saturni +10

Ultra-soft narrow line Seyfert 1 (US-NLSy) are a poorly observed class of active galactic nuclei characterized by significant flux changes and an extreme soft X-ray excess. This pe…