Astrophys. J., 884, 21-21 (2019/October-2)
Analysis of the spatially resolved V-3.6 µm colors and dust extinction in 257 nearby NGC and IC galaxies.
KIM D., JANSEN R.A., WINDHORST R.A., COHEN S.H. and McCABE T.J.
Abstract (from CDS):
We present and analyze spatially resolved maps for the observed V- and g-band to 3.6 µm flux ratios and the inferred dust-extinction values, AV, for a sample of 257 nearby NGC and IC galaxies. Flux ratio maps are constructed using point-spread function-matched mosaics of Sloan Digital Sky Survey g- and r-band images and Spitzer/InfraRed Array Camera 3.6 µm mosaics, with all pixels contaminated by foreground stars or background objects masked out. By applying the βV method, which was recently calibrated as a function of redshift and morphological type by Kim et al., dust-extinction maps were created for each galaxy. The typical 1σ scatter in βV around the average, both within a galaxy and in each morphological type bin, is ∼20%. Combined, these result in a ∼0.4 mag scatter in AV. βV becomes insensitive to small-scale variations in stellar populations once resolution elements subtend an angle larger than that of a typical giant molecular cloud (∼200 pc). We find noticeably redder V-3.6 µm colors in the center of star-forming galaxies and galaxies with a weak active galactic nucleus. The derived intrinsic V-3.6 µm colors for each Hubble type are generally consistent with the model predictions of Kim et al. Finally, we discuss the applicability of the βV dust-correction method to more distant galaxies, for which well-matched Hubble Space Telescope rest-frame visible and James Webb Space Telescope rest-frame ∼3.5 µm images will become available in the near-future.
© 2019. The American Astronomical Society. All rights reserved.
Extinction - Extragalactic astronomy - Photometry - Stellar populations - Surveys
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