XRISM XTEND observation 201098010

Title

GAS DYNAMICS IN THE LINE-OF-SIGHT MERGER ABELL 2163 WITH XRISM

Abstract

Abell 2163 is the hottest, most massive low redshift cluster in the universe. It is actively merging along the line-of-sight, with a Bullet-like cool core driving a turbulence-generating shock front ahead of it that has accelerated one of the most powerful radio halos known--a property known to correlate with higher turbulent velocity dispersion. With a single pointing of the center, we aim to measure turbulent line broadening, velocity offsets, and ion temperatures from the lines in the 6.7 keV and 7 keV Fe complexes with Resolve in two regions: one covering the reheated cool core and the other likely dominated by gas moving in the opposite direction. We will also constrain the larger-scale thermodynamic structure of the cluster with Xtend and NuSTAR.

FITS header

TELESCOP= 'XRISM   '           / Mission name
INSTRUME= 'XTEND   '           / Instrument name
OBS_ID  = '201098010'          / Observation identification string
OBJECT  = 'ABELL2163_CENTER'   / Object name
OBSERVER= 'DANIEL WIK'         / PI name
OBS_MODE= 'POINTING'           / POINTING or SLEW or ALL
RA_OBJ  =             243.9389 / [deg] Object Right ascension
DEC_OBJ =              -6.1457 / [deg] Object Declination
RA_PNT  =      243.94106473319 / Pointing RA
DEC_PNT =     -6.1440981574987 / Pointing DEC
RA_NOM  =      243.93878666149 / [deg] Nominal aspect point R.A.
DEC_NOM =    -6.14531233020543 / [deg] Nominal aspect point Dec.
PA_NOM  =     292.000461578211 / [deg] Nominal aspect point roll.
TELAPSE =               466718 / Elapsed time
DATE-OBS= '2025-07-28T07:37:15' / Start date
DATE-END= '2025-08-02T17:15:53' / Stop date
ONTIME  =         205201.51321 / On-source time
EXPOSURE=         205201.51321 / 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    = '2025-08-06T06:15:39' / Date and time this file was created or updated
SIB2_VER= 'V04.00  '           / SIB2 version JAXA

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