Analysis of the Spatially Resolved V-3.6 μm Colors and Dust Extinction in 257 Nearby NGC and IC Galaxies

Duho Kim, Rolf A. Jansen, Rogier A. Windhorst, Seth H. Cohen, Tyler J. Mccabe

Research output: Contribution to journalArticle

Abstract

We present and analyze spatially resolved maps for the observed V- A nd g-band to 3.6 μm flux ratios and the inferred dust-extinction values, A V, 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- A nd 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 β V 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 β V 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 A V. β V 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 β V 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.

Original languageEnglish (US)
Article number21
JournalAstrophysical Journal
Volume884
Issue number1
DOIs
StatePublished - Oct 10 2019

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extinction
dust
galaxies
color
pixel
stars
James Webb Space Telescope
point spread functions
prediction
molecular clouds
Hubble Space Telescope
active galactic nuclei
analysis
pixels
cameras
mosaic
method
predictions

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Analysis of the Spatially Resolved V-3.6 μm Colors and Dust Extinction in 257 Nearby NGC and IC Galaxies. / Kim, Duho; Jansen, Rolf A.; Windhorst, Rogier A.; Cohen, Seth H.; Mccabe, Tyler J.

In: Astrophysical Journal, Vol. 884, No. 1, 21, 10.10.2019.

Research output: Contribution to journalArticle

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