3C397
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.
obsid = 201061010 / Unique Observation/Sequence Number
object = 3C397 / Object name
pi_name = OHSHIRO YUKEN / Proposal Principal Investigator Name
ra = 286.880757897519 / Right Ascension (Pointing Position) (deg)
dec = 7.14565499873584 / Declination (Pointing Position) (deg)
roll_angle = 282.998377019226 / Roll Angle (deg)
start_time = 2024-10-12T12:13:04 / Start Time of the Observation
stop_time = 2024-10-17T00:57:04 / Stop Time of the Observation
exposure = 186503.57046046 / Effective Total Observation Exposure (s)
public_date= 2025-10-31 / Public Date