FIRST DIRECT MEASUREMENT OF THE POWER SPECTRUM OF INTERGALACTIC TURBULENCE
We propose the first direct measurement of the power spectrum of turbulence in the intracluster medium. The spectrum determines the flow of kinetic energy down the turbulent cascade and the amount that dissipates into heat and feeds cosmic ray acceleration and magnetic field amplification. The nearby Coma cluster is the best system for such a measurement, as it does not have a cool core or a powerful AGN, thus all gas motions should be merger-generated and the turbulence should develop in an isotropic, textbook fashion. Our full mosaic of 5 pointings will yield a measurement of the power spectrum normalization and injection scale, a combination that determines the energy flow. Our minimum case is the first detection of turbulence in a merging cluster using the central pointing.
TELESCOP= 'XRISM ' / Mission name INSTRUME= 'RESOLVE ' / Instrument name FILTER = 'FE55 ' / Filter name used OBS_ID = '300074010' / Observation identification string OBJECT = 'COMA_OFFSET' / Object name OBSERVER= 'XRISM Collaboration' / PI name OBS_MODE= 'POINTING' / POINTING or SLEW or ALL RA_OBJ = 194.94292 / [deg] Object Right ascension DEC_OBJ = 27.84583 / [deg] Object Declination RA_PNT = 194.944860625339 / Pointing RA DEC_PNT = 27.8444595507969 / Pointing DEC RA_NOM = 194.94118098214 / [deg] Nominal aspect point R.A. DEC_NOM = 27.846933593426 / [deg] Nominal aspect point Dec. PA_NOM = 313.826174779643 / [deg] Nominal aspect point roll. TELAPSE = 171035.638989002 / Elapsed time DATE-OBS= '2024-05-20T12:14:22.093750' / Start date DATE-END= '2024-05-22T11:44:57.732739' / Stop date ONTIME = 4267.5997158 / On-source time EXPOSURE= 4267.5997158 / Exposure time PROCVER = '03.00.013.009' / 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= 'gen20240315_xtd20240815_rsl20240815' / Version of CALDB used DATE = '2024-09-24T18:31:57' / Date and time this file was created or updated SIB2_VER= / SIB2 version JAXA