Three-dimensional structure of the milky way dust: modeling of LAMOST data

Abstract

We present a three-dimensional modeling of the Milky Way dust distribution by fitting the value-added star catalog of LAMOST spectral survey. The global dust distribution can be described by an exponential disk with scale-length of 3,192 pc and scale height of 103 pc. In this modeling, the Sun is located above the dust disk with a vertical distance of 23 pc. Besides the global smooth structure, two substructures around the solar position are also identified. The one located at $150^{\circ }<l<200^{\circ }$ and $-5^{\circ }<b<-30^{\circ }$ is consistent with the Gould Belt model of \citet{Gontcharov2009}, and the other one located at $140^{\circ }<l<165^{\circ }$ and $0^{\circ }<b<15^{\circ }$ is associated with the Camelopardalis molecular clouds.

15 pages, 6 figure, accepted by ApJ