CYGNUS_X-1
Cygnus X-1 is the archetype stellar-mass black hole. It is persistent, and bright (0.25-0.75~Crab in soft X-rays), making it a popular testing ground for accretion flow models of all types. Among many other potential tests, observations with Resolve can reveal a warped disk, test models of binary evolution, and discover whether or not winds are launched from small disks in wind-fed systems. Studies related to the massive, 09.7 Iab supergiant companion wind in Cygnus X-1 are not the focus of this proposal, but issues central to massive stars can also be explored with Resolve. Apart from addressing important science, Cygnus X-1 is an important PV-phase test case for bright sources that will inform similar observations in normal mission cycles.
obsid = 300049010 / Unique Observation/Sequence Number
object = CYGNUS_X-1 / Object name
pi_name = Collaboration XRISM / Proposal Principal Investigator Name
ra = 299.589682783352 / Right Ascension (Pointing Position) (deg)
dec = 35.2011626714573 / Declination (Pointing Position) (deg)
roll_angle = 89.7826977545363 / Roll Angle (deg)
start_time = 2024-04-07T16:55:04 / Start Time of the Observation
stop_time = 2024-04-10T13:41:04 / Stop Time of the Observation
exposure = 132022.93749646 / Effective Total Observation Exposure (s)
public_date= 2025-08-31 / Public Date