CFHT UM2025 - Presentation Details
Abstract Details
Title: Detection and characterization of supernova remnants in SIGNALS dwarf galaxies: the case of NGC 4449 and IC 1613
Presenter: Pénélope Glasman
Abstract:
We present the results of a study on supernova remnants (SNRs) in dwarf galaxies that are part of SIGNALS, SITELLE’s large survey program. To illustrate the case of SNRs in this seven-galaxy sample, we present the cases of NGC 4449 and IC 1613, two irregular galaxies located at 4.2 Mpc and 730 kpc, respectively. Regarding NGC 4449, we pursue a complete study of the physical properties of the 48 SNR candidates reported earlier. The detection of SNRs in NGC 4449 is particularly challenging due to the galaxy’s high star formation rate and the presence of ubiquitous Diffuse Ionised Gas (DIG) which complicates the use of the [SII]/Hα ratio as a diagnostic marker. For IC 1613, we present the two SNRs identified in this galaxy. The detection and characterization of SNRs are performed by leveraging the wide spectral range and large field of view (11’ x 11’) accessible with SITELLE. To address the various challenges of detection, we highlight the use of the ξ = σ× [SII]:Hα diagnostic diagram, where σ represents the velocity dispersion to distinguish SNRs from HII regions.