XRISM RESOLVE observation 201022010

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Title

DYNAMICAL STATE OF A UNIQUE COOLING-FLOW GALAXY CLUSTER AT Z~0.6

Abstract

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.

FITS header

TELESCOP= 'XRISM   '           / Mission name
INSTRUME= 'RESOLVE '           / Instrument name
FILTER  = 'OPEN    '           / Filter name used
OBS_ID  = '201022010'          / Observation identification string
OBJECT  = 'SPT-CL_J2344-4243'  / Object name
OBSERVER= 'TETSU KITAYAMA'     / PI name
OBS_MODE= 'POINTING'           / POINTING or SLEW or ALL
RA_OBJ  =             356.1829 / [deg] Object Right ascension
DEC_OBJ =               -42.72 / [deg] Object Declination
RA_PNT  =     356.179552268878 / Pointing RA
DEC_PNT =    -42.7237930806993 / Pointing DEC
RA_NOM  =     356.183010195649 / [deg] Nominal aspect point R.A.
DEC_NOM =    -42.7205910298077 / [deg] Nominal aspect point Dec.
PA_NOM  =     45.0032163309829 / [deg] Nominal aspect point roll.
TELAPSE =     580014.801108986 / Elapsed time
DATE-OBS= '2025-04-27T05:35:33' / Start date
DATE-END= '2025-05-03T22:42:27.801109' / Stop date
ONTIME  =         274738.03072 / On-source time
EXPOSURE=         274738.03072 / Exposure time
PROCVER = '03.02.014.010'      / Processing script version
MKFFF   = 'ISAS/JAXA'          / Origin of First FITS file
ORIGIN  = 'GSFC/NASA'          / Origin of Processed FITS file
SOFTVER = 'Hea_12Mar2025_V6.35_XRISM_28Feb2025_V002' / Version of HEADAS used
CALDBVER= 'gen20241115_xtd20241115_rsl20241115' / Version of CALDB used
DATE    = '2025-07-13T17:36:02' / Date and time this file was created or updated
SIB2_VER= 'V03.01  '           / SIB2 version JAXA

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