XRISM RESOLVE observation 902005010

Title

DDT TOO REQUEST OF HERCULES X-1

Abstract

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.

FITS header

TELESCOP= 'XRISM   '           / Mission name
INSTRUME= 'RESOLVE '           / Instrument name
FILTER  = 'OPEN    '           / Filter name used
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  =     254.451056072798 / Pointing RA
DEC_PNT =     35.3423851840601 / 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 =     59298.7755149901 / Elapsed time
DATE-OBS= '2026-03-20T14:20:09' / Start date
DATE-END= '2026-03-21T06:48:27.775515' / Stop date
ONTIME  =         31373.825752 / On-source time
EXPOSURE=         31373.825752 / 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

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