ORIGIN OF THE OVER-IONIZED PLASMA WITH AN EXTRAORDINARILY HIGH INITIAL TEMPERATURE IN SUPERNOVA REMNANT N49
We propose a 200-ks XRISM observation of the supernova remnant (SNR) N49. Our goals are to understand the evolutionary process of the over-ionized plasma, and to clarify the forming mechanism of an associated magnetar. Combining with the XRISM observation with the Reflection Grating Spectrometer on board XMM Newton, we will be able to perform unique plasma diagnostics using Fe K and L shell lines, and to establish the first robust constraint on the initial electron temperature of this peculiar over-ionized plasma. In addition to these line diagnostics, measurements of the line-of-sight expansion structure and proton cyclotron absorption features will provide insights into the explosion mechanism and nature of the progenitor of N49.
TELESCOP= 'XRISM ' / Mission name INSTRUME= 'RESOLVE ' / Instrument name FILTER = 'FE55 ' / Filter name used OBS_ID = '201059010' / Observation identification string OBJECT = 'N49 ' / Object name OBSERVER= 'YUKI AMANO' / PI name OBS_MODE= 'POINTING' / POINTING or SLEW or ALL RA_OBJ = 81.497 / [deg] Object Right ascension DEC_OBJ = -66.0829 / [deg] Object Declination RA_PNT = 81.5048796018311 / Pointing RA DEC_PNT = -66.0859250864714 / Pointing DEC RA_NOM = 81.4981888548993 / [deg] Nominal aspect point R.A. DEC_NOM = -66.0828673594626 / [deg] Nominal aspect point Dec. PA_NOM = 325.005721417909 / [deg] Nominal aspect point roll. TELAPSE = 480412.766086012 / Elapsed time DATE-OBS= '2025-04-16T16:19:05.078125' / Start date DATE-END= '2025-04-22T05:45:57.844211' / Stop date ONTIME = 3531.6658857 / On-source time EXPOSURE= 3531.6658857 / 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 = '2025-04-25T13:33:20' / Date and time this file was created or updated SIB2_VER= 'V03.01 ' / SIB2 version JAXA