Speaker
Description
This study presents a spectroscopic analysis of the central few parsecs around Sgr A* using the Mid-Infrared Instrument in Medium-Resolution Spectroscopy (MIRI-MRS) Integral-Field Spectroscopy (IFS) mode on JWST. Data consist of calibrated three-dimensional spectral cubes spanning the full MRS coverage λ∈[4.9, 27.9] μm at resolving power R∈[1330, 3750]. From these cubes we derive region-integrated spectra that trace dynamics in the immediate environment of the Galactic Center (GC). The spatial sampling and spectral resolution provide the first systematic mid-IR integral-field view of these dynamics at the GC. As an initial application, a 13-spaxel aperture spectrum of the Ofpe/WN9 star IRS 16 NW is analyzed in Channel 1. Residual sub-band discontinuities are corrected by anchoring to the most photometrically stable sub-band and applying additive offsets at seams. Candidate emission and absorption features are isolated via sliding-median continuum subtraction and a prominence-based significance test, then identified by rest-wavelength matching within standard GC velocity bounds. Lines are refined through multi-component deblending (with Gaussians) and velocity-based association across lines. Unknown lines and potential implications are discussed.
| Keyword-1 | Integral-Field Spectroscopy |
|---|---|
| Keyword-2 | Sagittarius A* |
| Keyword-3 | IRS 16 NW |