Cas_A_NW
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.
obsid = 000130000 / Unique Observation/Sequence Number
object = Cas_A_NW / Object name
pi_name = Tashiro Makoto / Proposal Principal Investigator Name
ra = 350.830623422035 / Right Ascension (Pointing Position) (deg)
dec = 58.8224439117093 / Declination (Pointing Position) (deg)
roll_angle = 254.057231310686 / Roll Angle (deg)
start_time = 2023-12-14T14:01:04 / Start Time of the Observation
stop_time = 2023-12-17T16:01:04 / Stop Time of the Observation
exposure = 223023.7031393 / Effective Total Observation Exposure (s)
public_date= 2025-08-31 / Public Date