3D Interstellar Extinction Map within the Nearest Kiloparsec
George Gontcharov

TL;DR
This study presents a high-resolution 3D interstellar extinction map within 1 kpc of the Sun, integrating previous reddening and $R_V$ variation maps, and compares it with existing models to analyze dust properties and Galactic structures.
Contribution
It provides a new detailed 3D extinction map with improved accuracy and resolution, and analyzes the spatial variations of reddening and $R_V$ across the nearest kiloparsec.
Findings
Good agreement with existing maps and models except near the Galactic center.
Schlegel et al.'s map saturates at high reddening and has systematic errors.
Dust grain properties vary systematically across different Galactic regions.
Abstract
The product of the previously constructed 3D maps of stellar reddening (Gontcharov 2010) and variations (Gontcharov 2012) has allowed us to produce a 3D interstellar extinction map within the nearest kiloparsec from the Sun with a spatial resolution of 50 pc and an accuracy of . This map is compared with the 2D reddening map by Schlegel et al. (1998), the 3D extinction map at high latitudes by Jones et al. (2011), and the analytical extinction models by Arenou et al. (1992) and Gontcharov (2009). In all cases, we have found good agreement and show that there are no systematic errors in the new map everywhere except the direction toward the Galactic center. We have found that the map by Schlegel et al. (1998) reaches saturation near the Galactic equator at , has a zero-point error and systematic errors gradually increasing with reddening, and among the…
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