UNVEILING THE BLACK HOLE IN CYG X-3
We propose a 40 ks (minimal)/80 ks (ideal) observation of the unique and enigmatic high mass X-ray binary (HMXB) Cyg X-3. The iron line region in the Cyg X-3 spectrum contains hints of the dynamical effects of the black hole in this system. Improved measurements of the iron line radial velocity curve can be used to refine mass estimates for the black hole. In the soft state, there is surprising absorption from intermediate ion stages of iron, superimposed on a broad and complex emission. In the hard state the line is narrow and components of the line may have shifts indicative of the relativistic jet.
TELESCOP= 'XRISM ' / Mission name INSTRUME= 'XTEND ' / Instrument name OBS_ID = '300065010' / Observation identification string OBJECT = 'Cyg_X-3 ' / Object name OBSERVER= 'XRISM Collaboration' / PI name OBS_MODE= 'POINTING' / POINTING or SLEW or ALL RA_OBJ = 308.10708 / [deg] Object Right ascension DEC_OBJ = 40.95775 / [deg] Object Declination RA_PNT = 308.087719351785 / Pointing RA DEC_PNT = 40.9582811643285 / Pointing DEC RA_NOM = 308.107075511504 / [deg] Nominal aspect point R.A. DEC_NOM = 40.9586412304539 / [deg] Nominal aspect point Dec. PA_NOM = 112.258824024504 / [deg] Nominal aspect point roll. TELAPSE = 121138.562087983 / Elapsed time DATE-OBS= '2024-03-24T06:53:50.398730' / Start date DATE-END= '2024-03-25T16:32:48.960818' / Stop date ONTIME = 8115.6302585 / On-source time EXPOSURE= 8115.6302585 / Exposure time PROCVER = '03.00.013.009' / Processing script version MKFFF = 'ISAS/JAXA' / Origin of First FITS file ORIGIN = 'GSFC/NASA' / Origin of Processed FITS file SOFTVER = 'Hea_21Aug2024_V6.34_XRISM_21Aug2024_V001' / Version of HEADAS used CALDBVER= 'gen20240315_xtd20240815_rsl20240815' / Version of CALDB used DATE = '2024-09-23T12:00:14' / Date and time this file was created or updated SIB2_VER= / SIB2 version JAXA