PROBING THE PHYSICS OF TURBULENT PARTICLE ACCELERATION IN ``THE TOOTHBRUSH''
At radio frequencies, the Toothbrush Cluster is a spectacular source that has been essential in revealing details of the particle acceleration generated during mergers. We propose to map the velocity field of the intracluster medium in this remarkable target with two Resolve pointings. One will probe the radio halo, where particle acceleration is driven by developed turbulence. The second will probe the region between the halo and the 2~Mpc-long radio shock, where strong gradients in the radio spectral index map indicate a transition between turbulence-driven and shock-driven acceleration. Determining and comparing the line broadening and shifts between these regions will provide key information needed to complete physical picture of cosmic ray electron acceleration on the largest scales.
TELESCOP= 'XRISM ' / Mission name INSTRUME= 'XTEND ' / Instrument name OBS_ID = '201032010' / Observation identification string OBJECT = 'TOOTHBRUSH_S' / Object name OBSERVER= 'HIROKI AKAMATSU' / PI name OBS_MODE= 'POINTING' / POINTING or SLEW or ALL RA_OBJ = 90.8316 / [deg] Object Right ascension DEC_OBJ = 42.2021 / [deg] Object Declination RA_PNT = 90.833121319384 / Pointing RA DEC_PNT = 42.2036694141242 / Pointing DEC RA_NOM = 90.8305159975959 / [deg] Nominal aspect point R.A. DEC_NOM = 42.2019724562963 / [deg] Nominal aspect point Dec. PA_NOM = 278.869151372648 / [deg] Nominal aspect point roll. TELAPSE = 259008.921875 / Elapsed time DATE-OBS= '2025-02-22T13:11:17.078125' / Start date DATE-END= '2025-02-25T13:08:06' / Stop date ONTIME = 137308.21053 / On-source time EXPOSURE= 137308.21053 / 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 = '2025-03-06T08:42:56' / Date and time this file was created or updated SIB2_VER= 'V03.01 ' / SIB2 version JAXA