OPHIUCHUS_CLUSTER
The Ophiuchus cluster, the second brightest X-ray source, provides a unique study of an exceptionally hot (9keV) cluster. Despite high temperatures indicating merger disruption, it has retained its cool core. Previous observations conflict on the internal gas velocity in the core, ranging from <100 to >2000km/s. We will use the spectral resolution of XRISM to precisely measure the velocity, resolve the discrepancy, and reveal the core destruction processes. The obtained velocity will allow the estimation of instability timescales that drive core evolution. We will also study elemental abundances to see if the population of supernovae differs from cooler clusters. This multi-pronged approach will provide insights into the formation and evolution of this extraordinary cluster.
obsid = 201006010 / Unique Observation/Sequence Number
object = OPHIUCHUS_CLUSTER / Object name
pi_name = FUJITA YUTAKA / Proposal Principal Investigator Name
ra = 258.114002197688 / Right Ascension (Pointing Position) (deg)
dec = -23.3686496138755 / Declination (Pointing Position) (deg)
roll_angle = 94.8431268734683 / Roll Angle (deg)
start_time = 2025-03-31T22:16:04 / Start Time of the Observation
stop_time = 2025-04-06T11:51:04 / Stop Time of the Observation
exposure = 217117.77051 / Effective Total Observation Exposure (s)
public_date= 2026-04-16 / Public Date