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SUMMARY:XRISM observations of the X-ray pulsar Hercules X-1 - Peter Kosec
DTSTART:20250521T124000Z
DTEND:20250521T130500Z
UID:TALK232498@talks.cam.ac.uk
CONTACT:Cristiano Longarini
DESCRIPTION:Hercules X-1 is one of the most complex X-ray binary systems. 
 It is known to harbor a strongly magnetized\, highly accreting neutron sta
 r. Thanks to the high inclination of the binary\, a warped accretion disk 
 precessing every 35 days\, and the neutron star rotating every 1.27 second
 s\, the system exhibits a very broad range of timing and spectral phenomen
 a. These include X-ray pulsations\, eclipses\, absorption dips\, cyclotron
  lines\, accretion disk winds and emission lines observed from various par
 ts of the accretion flow. The unique properties of Her X-1 allow us to rev
 eal the physics of accretion in X-ray binaries through means that are impo
 ssible in other systems.\nIn September 2024\, we carried out a large obser
 vational campaign on Hercules X-1 led by the new XRISM observatory. With o
 ver 200 ks of XRISM exposure time and a spectral resolution of better than
  5 eV in the Fe K energy band (R>1000 - more than 10 times better than pre
 vious instruments)\, we are for the first time able to resolve and separat
 e the various evolving emission and absorption components spectrally\, and
  in time. In this talk\, I will present the first results from this campai
 gn\, and the novel insights it provides into our understanding of accretio
 n disk wind physics\, and of X-ray pulsar accretion.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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