arXiv: Solar and Stellar Astrophysics | VOL. 38
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3D Interstellar Extinction Map within the Nearest Kiloparsec

Publication Date Jun 30, 2016

Abstract

The product of the previously constructed 3D maps of stellar reddening (Gontcharov 2010) and $R_V$ 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 $0.2^m$. 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 $E_{(B-V)}>0.8^m$, has a zero-point error and systematic errors gradually increasing with reddening, and among the analytical models those that take into account the extinction in the Gould Belt are more accurate. Our extinction map shows that it is determined by reddening variations at low latitudes and $R_V$ variations at high ones. This naturally explains the contradictory data on the correlation or anticorrelation between reddening and $R_V$ available in the literature. There is a correlation in a thin layer near the Galactic equator, because both reddening and $R_V$ here increase toward the Galactic center. There is an anticorrelation outside this layer, because higher values of $R_V$ correspond to lower reddening at high and middle latitudes. Systematic d...

Concepts

3D Extinction Map High Latitudes Gould Belt Extinction Map Analytical Models Galactic Equator 3D Map Galactic Center 3D Extinction Zero-point Error

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