XRISM RESOLVE observation 201061010

Title

THE SUPERNOVA REMNANT 3C 397: A PROBE FOR TYPE IA SUPERNOVAE ORIGINATING FROM EXCEPTIONALLY HIGH-DENSITY WHITE DWARFS

Abstract

Thermonuclear explosions of carbon-oxygen white dwarfs (WDs), or Type Ia supernovae (SNe Ia), are important astrophysical phenomena but their exact nature still remains uncertain. Here we propose an XRISM observation of 3C 397, an ``outlier'' of Type Ia supernova remnant likely originating from a near-Chandrasekhar mass WD with an exceptionally high central density (Ohshiro et al. 2021). Thanks to the high spectral resolution of Resolve, we can measure the abundance ratios of Fe-peak elements with unprecedented accuracy. In combination with the performance verification phase observation, this SNR is fully covered by Resolve FoV, enabling us to investigate the spatial distribution of heavy elements.

FITS header

TELESCOP= 'XRISM   '           / Mission name
INSTRUME= 'RESOLVE '           / Instrument name
FILTER  = 'OPEN    '           / Filter name used
OBS_ID  = '201061010'          / Observation identification string
OBJECT  = '3C397   '           / Object name
OBSERVER= 'YUKEN OHSHIRO'      / PI name
OBS_MODE= 'POINTING'           / POINTING or SLEW or ALL
RA_OBJ  =             286.8805 / [deg] Object Right ascension
DEC_OBJ =               7.1453 / [deg] Object Declination
RA_PNT  =     286.884851420716 / Pointing RA
DEC_PNT =     7.14519787739598 / Pointing DEC
RA_NOM  =     286.880757897519 / [deg] Nominal aspect point R.A.
DEC_NOM =     7.14565499873584 / [deg] Nominal aspect point Dec.
PA_NOM  =     282.998377019226 / [deg] Nominal aspect point roll.
TELAPSE =     385041.981168985 / Elapsed time
DATE-OBS= '2024-10-12T13:27:07' / Start date
DATE-END= '2024-10-17T00:24:28.981169' / Stop date
ONTIME  =         184284.03753 / On-source time
EXPOSURE=         184284.03753 / 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    = '2024-10-26T08:31:03' / Date and time this file was created or updated
SIB2_VER= 'V03.01  '           / SIB2 version JAXA

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