Three-Dimensional Distribution of the Interstellar Dust in the Milky Way

Abstract

We present a three-dimensional (3D) extinction map of the southern sky. The map covers the SkyMapper Southern Survey (SMSS) area of $\sim$ 14,000 $\mathrm{de}{\mathrm{g}}^2$ and has spatial resolutions between 6.9 and 27 arcmin. Based on the multi-band photometry of SMSS, the Two Micron All Sky Survey, the Wide-Field Infrared Survey Explorer Survey and the Gaia mission, we have estimated values of the $r$-band extinction for $\sim$ 19 million stars with the spectral energy distribution (SED) analysis. Together with the distances calculated from the Gaia data release 2 (DR2) parallaxes, we have constructed a three-dimensional extinction map of the southern sky. By combining our 3D extinction map with those from the literature, we present an all-sky 3D extinction map, and use it to explore the 3D distribution of the Galactic dust grains. We use two different models, one consisting a single disk and another of two disks, to fit the 3D distribution of the Galactic dust grains. The data is better fitted by a two-disk model, yielding smaller values of the Bayesian Information Criterion (BIC). The best fit model has scale heights of 73 and 225 pc for the "thin" and "thick" dust disks, respectively.

18 pages, 14 figures, accepted for publication in ApJ, data avaiable via https://nadc.china-vo.org/article/20200722160959?id=101032

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Cited by in corpus (7)

• Updated Gaia-2MASS 3D maps of Galactic interstellar dust
• GALExtin: An alternative online tool to determine the interstellar extinction in the Milky Way
• Correction to the photometric colors of Gaia Early Data Release 3
• Dust distributions in the Magellanic Clouds
• A large catalogue of molecular clouds in the southern sky
• Weather Forecast of the Milky Way: Shear and Stellar feedback determine the lives of Galactic-scale filaments
• The distances of 61 PGCCs in the Second Galactic Quadrant