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.
obsid = 300065010 / Unique Observation/Sequence Number
object = Cyg_X-3 / Object name
pi_name = Collaboration XRISM / Proposal Principal Investigator Name
ra = 308.107075511504 / Right Ascension (Pointing Position) (deg)
dec = 40.9586412304539 / Declination (Pointing Position) (deg)
roll_angle = 112.258824024504 / Roll Angle (deg)
start_time = 2024-03-24T06:04:04 / Start Time of the Observation
stop_time = 2024-03-25T16:34:04 / Stop Time of the Observation
exposure = 67338.60476491 / Effective Total Observation Exposure (s)
public_date= 2025-08-31 / Public Date