SPT-CL_J2344-4243
We propose a 250 ksec observation of the Phoenix cluster at z=0.597, the most X-ray luminous galaxy cluster as well as the only cooling flow cluster known to date. By combining Fe XXV and Fe XXVI lines, we will be able to measure velocities both inside and outside the cool core, thereby complementing the lack of spatial resolution of XRISM by its spectral capability. Our goals include testing if (i) turbulent heating can be a generic mechanism for heating the cool core, (ii) hydrostatic equilibrium is valid for this apparently quiescent system, and (iii) there are any large-scale structures associated with the most massive galaxy cluster at z~0.6. The proposed XRISM observation will provide unprecedented view of the distant diffuse Universe even with the closed Gate Valve configuration.
obsid = 201022010 / Unique Observation/Sequence Number
object = SPT-CL_J2344-4243 / Object name
pi_name = KITAYAMA TETSU / Proposal Principal Investigator Name
ra = 356.183010195649 / Right Ascension (Pointing Position) (deg)
dec = -42.7205910298077 / Declination (Pointing Position) (deg)
roll_angle = 45.0032163309829 / Roll Angle (deg)
start_time = 2025-04-27T04:30:04 / Start Time of the Observation
stop_time = 2025-05-03T23:15:04 / Stop Time of the Observation
exposure = 274738.03072 / Effective Total Observation Exposure (s)
public_date= 2026-06-03 / Public Date