OBSERVING CAS A WITH XRISM: FROM A SUPERNOVA'S INNER WORKINGS TO THE IMPRINTS OF COSMIC-RAY ACCELERATION
Cas A is the archetypal young core-collapse SNR, with X-ray knots dominated by O-, Si-, and Fe-rich plasma, and a pair of Si-rich jets. Cas A is a bright source of IR dust emission. The primary observational goals are to detect emission from Na, Al, P, Cl, K, Cr in different ejecta layers, and spectral dust signatures: fluorescence lines, and low ionisation Si and Mg continuously injected into the plasma by grain sputtering. This results in a red tail to Mg/Si K-lines, in contrast to Ne/S K-lines. Secondary goals are accurate mapping of plasma parameters, and measuring Doppler shifts/broadening due to bulk motion and thermal broadening. Previous results based on centroiding were affected by varying line-blends, which can be disentangled by Resolve.
TELESCOP= 'XRISM ' / Mission name INSTRUME= 'XTEND ' / Instrument name OBS_ID = '000130000' / Observation identification string OBJECT = 'Cas_A_NW' / Object name OBSERVER= 'Makoto Tashiro' / PI name OBS_MODE= 'POINTING' / POINTING or SLEW or ALL RA_OBJ = 350.8276 / [deg] Object Right ascension DEC_OBJ = 58.8232 / [deg] Object Declination RA_PNT = 350.852390004274 / Pointing RA DEC_PNT = 58.8317636805919 / Pointing DEC RA_NOM = 350.830623422035 / [deg] Nominal aspect point R.A. DEC_NOM = 58.8224439117093 / [deg] Nominal aspect point Dec. PA_NOM = 254.057231310686 / [deg] Nominal aspect point roll. TELAPSE = 266007.765625 / Elapsed time DATE-OBS= '2023-12-14T14:02:49.234375' / Start date DATE-END= '2023-12-17T15:56:17' / Stop date ONTIME = 212497.59651 / On-source time EXPOSURE= 212497.59651 / 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 = '2024-09-20T21:55:53' / Date and time this file was created or updated SIB2_VER= / SIB2 version JAXA