DYNAMICS OF THE COLLISIONAL SHOCKS DRIVEN BY THE MASSIVE BINARY ETA CARINAE
A massive mass-loss wind from the evolved supermassive star, eta Carinae, collides with a fast wind from its hidden companion and produces hot plasma at ~50 MK. The X-ray spectra show strong He-like iron K lines from the hot plasma and iron K fluorescence produced by absorption and reemission of the hard X-ray emission at the primary wind. These emission lines should hold crucial information on the shocked gas at the head-on collision, which would flow with a few hundred to thousand km s-1. The star is also surrounded by a ring-shaped diffuse soft X-ray nebula, whose emission lines may show Doppler broadening or shift if the nebula originates from a supernova imposter event in the 1840s. We aim to resolve these emission line features for the first time with XRISM/Resolve.
TELESCOP= 'XRISM ' / Mission name INSTRUME= 'XTEND ' / Instrument name OBS_ID = '300067010' / Observation identification string OBJECT = 'Eta_Carinae' / Object name OBSERVER= 'XRISM Collaboration' / PI name OBS_MODE= 'POINTING' / POINTING or SLEW or ALL RA_OBJ = 161.26479 / [deg] Object Right ascension DEC_OBJ = -59.68444 / [deg] Object Declination RA_PNT = 161.289142879448 / Pointing RA DEC_PNT = -59.6778257841303 / Pointing DEC RA_NOM = 161.263260104871 / [deg] Nominal aspect point R.A. DEC_NOM = -59.6843894392188 / [deg] Nominal aspect point Dec. PA_NOM = 267.002116850774 / [deg] Nominal aspect point roll. TELAPSE = 371883 / Elapsed time DATE-OBS= '2024-06-09T00:54:47' / Start date DATE-END= '2024-06-13T08:12:50' / Stop date ONTIME = 183448.11782 / On-source time EXPOSURE= 183448.11782 / 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 = '2024-09-24T08:23:31' / Date and time this file was created or updated SIB2_VER= / SIB2 version JAXA