Estimating Dust Attenuation From Galactic Spectra. II. Stellar and Gas Attenuation in Star-forming and Diffuse Ionized Gas Regions in MaNGA

We investigate the dust attenuation in both stellar populations and ionized gas kpc-scale regions nearby galaxies, using integral field spectroscopy data from MaNGA MPL-9. identify star-forming (HII) diffuse (DIG) datacubes. From stacked spectrum of each region, we measure attenuation, $E(B-V)_{\rm star}$, technique developed by Li et al.(2020), as well gas}$, Balmer decrement. then examine correlation gas}-E(B-V)_{\rm star}$ star}/E(B-V)_{\rm gas}$ with 16 regional/global properties, for different $\rm H{\alpha}$ surface brightnesses ($\Sigma_{\rm H\alpha}$). find a stronger between higher $\Sigma_{\rm H\alpha}$. Luminosity-weighted age ($t_L$) is found to be property that most strongly correlated consequently gas}$. At fixed H\alpha}$, $\log_{10}t_L$ linearly negatively at all ages. Gas-phase metallicity ionization level are important gas. Our results indicate ionizing source DIG likely distributed outer-skirt while HII our can explained two-component model Charlot & Fall (2000).