NON-THERMAL PRESSURE SUPPORT IN RELAXED GALAXY CLUSTERS
We propose XRISM Resolve observations to measure the turbulence and bulk motion of the intracluster medium (ICM) in the outer regions of a relaxed galaxy cluster, Abell 2029. Such non-thermal pressure support causes a bias in cluster masses measured from X-rays under the assumption of hydrostatic equilibrium, and understanding its magnitude has broad implications for cosmological results that use cluster mass scaling relations. These will be the first direct measurements of the kinematic ICM structure outside the cluster core, and they will also confront predictions from numerical simulations that suggest non-thermal pressure support could be substantial here. We will simultaneously obtain Xtend spectral imaging at the virial radius to a depth exceeding existing Suzaku observations.
TELESCOP= 'XRISM ' / Mission name INSTRUME= 'XTEND ' / Instrument name OBS_ID = '300053010' / Observation identification string OBJECT = 'Abell2029_N2' / Object name OBSERVER= 'XRISM Collaboration' / PI name OBS_MODE= 'POINTING' / POINTING or SLEW or ALL RA_OBJ = 227.7941 / [deg] Object Right ascension DEC_OBJ = 5.8243 / [deg] Object Declination RA_PNT = 227.808844188406 / Pointing RA DEC_PNT = 5.82675015843195 / Pointing DEC RA_NOM = 227.794314069496 / [deg] Nominal aspect point R.A. DEC_NOM = 5.82454761614817 / [deg] Nominal aspect point Dec. PA_NOM = 284.999190822666 / [deg] Nominal aspect point roll. TELAPSE = 698440.963135988 / Elapsed time DATE-OBS= '2024-07-27T17:15:09.036864' / Start date DATE-END= '2024-08-04T19:15:50' / Stop date ONTIME = 350240.0645 / On-source time EXPOSURE= 350240.0645 / 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 = '2024-09-25T06:53:51' / Date and time this file was created or updated SIB2_VER= / SIB2 version JAXA