DDT TOO REQUEST OF HERCULES X-1
The precessing and distorted accretion disk of Hercules X-1 (Her X-1), a neutron star X-ray binary, may cause its 35-day cycle of high and low X-ray states. Since the last report of the extended low state in 2003, Her X-1 would enter a new state. XRISM is suitable for illustrating a high-resolution view of this state. The neutral absorber column density and the Compton shoulder will be examined by spectral curvature and Fe-K edge depth analysis. The narrow Fe I and several broad Fe K line fluxes may indicate the total brightness of Her X-1. We examine pulsations and analyse the influence of pulse phase on the spectrum. All these measurements will investigate which disk or accretion physics have been modified in the anomalous state.
TELESCOP= 'XRISM ' / Mission name INSTRUME= 'XTEND ' / Instrument name OBS_ID = '902005010' / Observation identification string OBJECT = 'HERCULES_X-1' / Object name OBSERVER= 'XRISM Collaboration' / PI name OBS_MODE= 'POINTING' / POINTING or SLEW or ALL RA_OBJ = 254.4575 / [deg] Object Right ascension DEC_OBJ = 35.3424 / [deg] Object Declination RA_PNT = 254.454030702903 / Pointing RA DEC_PNT = 35.3408972263597 / Pointing DEC RA_NOM = 254.456029499838 / [deg] Nominal aspect point R.A. DEC_NOM = 35.3428836814588 / [deg] Nominal aspect point Dec. PA_NOM = 89.573571811214 / [deg] Nominal aspect point roll. TELAPSE = 59814.9631359875 / Elapsed time DATE-OBS= '2026-03-20T14:20:09.036864' / Start date DATE-END= '2026-03-21T06:57:04' / Stop date ONTIME = 29603.699555 / On-source time EXPOSURE= 29603.699555 / Exposure time PROCVER = '03.03.015.012' / Processing script version MKFFF = 'ISAS/JAXA' / Origin of First FITS file ORIGIN = 'GSFC/NASA' / Origin of Processed FITS file SOFTVER = 'Hea_26Sep2025_V6.36_XRISM_12Sep2025_V003' / Version of HEADAS used CALDBVER= 'gen20241115_xtd20250915_rsl20250915' / Version of CALDB used DATE = '2026-03-26T01:22:54' / Date and time this file was created or updated SIB2_VER= 'V04.00 ' / SIB2 version JAXA