ICM VELOCITY STRUCTURE UNVEILED: THE COMA CLUSTER MERGING NATURE
Though crucial for cluster physics, direct measurements of the intracluster medium (ICM) velocity structure are scarce. Recent advancements have enabled ICM velocity measurements in various clusters using the XMM-Newton EPIC-pn instrument. This employs Cu Ka line for recalibration. In the Coma cluster, distinct velocities, likely linked to subgroup mergers, have been identified. To explore further, the exceptional capabilities of the XRISM instruments are vital. Hence, we propose a 135 ks observation of the Coma cluster to map its ICM velocity structure and investigate potential merging scenarios.
TELESCOP= 'XRISM ' / Mission name INSTRUME= 'XTEND ' / Instrument name OBS_ID = '201114010' / Observation identification string OBJECT = 'COMA_OFFSET_N' / Object name OBSERVER= 'EFRAIN GATUZZ' / PI name OBS_MODE= 'POINTING' / POINTING or SLEW or ALL RA_OBJ = 194.943 / [deg] Object Right ascension DEC_OBJ = 28.0484 / [deg] Object Declination RA_PNT = 194.938952240793 / Pointing RA DEC_PNT = 28.0475214436936 / Pointing DEC RA_NOM = 194.941356303973 / [deg] Nominal aspect point R.A. DEC_NOM = 28.0489715160174 / [deg] Nominal aspect point Dec. PA_NOM = 105.844539552447 / [deg] Nominal aspect point roll. TELAPSE = 276251 / Elapsed time DATE-OBS= '2025-01-14T11:18:12' / Start date DATE-END= '2025-01-17T16:02:23' / Stop date ONTIME = 148103.39185 / On-source time EXPOSURE= 148103.39185 / Exposure time PROCVER = '03.00.013.010' / Processing script version MKFFF = 'ISAS/JAXA' / Origin of First FITS file ORIGIN = 'GSFC/NASA' / Origin of Processed FITS file SOFTVER = 'Hea_21Aug2024_V6.34_XRISM_21Aug2024_V001' / Version of HEADAS used CALDBVER= 'gen20241115_xtd20241115_rsl20241115' / Version of CALDB used DATE = '2025-01-21T10:15:01' / Date and time this file was created or updated SIB2_VER= 'V03.01 ' / SIB2 version JAXA