GRS1758-258
We propose a 40 ks observation of the Galactic black hole X-ray binary GRS 1758-258, to search for disk winds and to understand the relativistic effects in the vicinity of the black hole, through Resolve high-resolution spectroscopy. The source is one of only few persistent Galactic black hole X-ray binaries, and thus provides us with sufficient quality data for these studies at anytime when it is in XRISM's observing window. Resolve spectrum enables us to investigate the presence/absence of absorption lines from winds, including the ultrafast outflow with a velocity ~0.1c suggested in a previous Suzaku study of this source. It also helps to constrain the disk truncation radius and black hole spin, by modeling the broad Fe K alpha line profile with relativistic emission line model.
obsid = 202050010 / Unique Observation/Sequence Number
object = GRS1758-258 / Object name
pi_name = SHIDATSU MEGUMI / Proposal Principal Investigator Name
ra = 270.301469477583 / Right Ascension (Pointing Position) (deg)
dec = -25.7427263942694 / Declination (Pointing Position) (deg)
roll_angle = 89.1061994443491 / Roll Angle (deg)
start_time = 2026-03-22T01:42:04 / Start Time of the Observation
stop_time = 2026-03-23T00:42:04 / Stop Time of the Observation
exposure = 50297.89196 / Effective Total Observation Exposure (s)
public_date= 2027-04-10 / Public Date