摘要
This is the second paper in a series that utilizes integral field spectroscopy from MaNGA,NUV imaging from Swift/UVOT,and NIR imaging from 2MASS to investigate dust attenuation properties on kpc scales in nearby galaxies.We apply the method developed in our previous work to the updated SwiM_v4.2 catalog,and measure the optical attenuation curve and the attenuation in three NUV bands for 2487 spaxels selected from 91 galaxies with S/N> 20 and AV> 0.25.We classify all spaxels into two subsets:star-forming(SF) regions and non-SF regions.We explore the correlations of optical opacity(A_(V)) and the optical and NUV slopes of the attenuation curves(A_(B)/A_(V) and A_(w2)/A_(w1)) with a broad range of stellar population and emission-line properties,including specific surface brightness of Hα emission(∑_(Hα)/∑_(*)),stellar age,stellar and gas-phase metallicity,and diagnostics of recent star formation history.Overall,when comparing SF and non-SF regions,we find that A_(V) and A_(B)/A_(V) exhibit similar correlations with all the stellar population and emission-line properties considered,while the NUV slopes in SF regions tend to be flatter than those in non-SF regions.The NUV slope A_(w2)/A_(w1) exhibits an anti-correlation with ∑_(Hα)/∑_(*),a trend that is primarily driven by the positive correlation between A_(w2)/A_(w1) and ∑_(*).The NUV slope flattens in SF regions that contain young stellar populations and have experienced recent star formation,but it shows no obvious dependence on stellar or gas-phase metallicity.The spatially resolved dust attenuation properties exhibit no clear correlations with the inclination of host galaxies or the galactocentric distance of the regions.This finding reinforces the conclusion from Paper I that dust attenuation is primarily regulated by local processes on kpc scales or smaller,rather than by global processes at galactic scales.
基金
supported by the National Key R&D Program of China (grant No. 2022YFA1602902)
the National Natural Science Foundation of China (grant Nos. 12433003, 11821303 and 11973030)
the China Manned Space Program through its Space Application System.
