title: Mapping 3D Extinction and Structures in the Milky Way
creator: Hanson, Richard James
subject: ddc-520
subject: 520 Astronomy and allied sciences
description: We present a parametric Bayesian method to simultaneously infer interstellar extinction, stellar effective temperature and distance modulus to stars. We create three dimensional maps of extinction towards the Galactic poles using multiband photometry from Sloan Digital Sky Survey and UKIRT Infrared Deep Sky Survey, and maps in the Galactic plane using data from Pan-STARRS1 and Spitzer GLIMPSE surveys.  Using optical and near-infrared photometry we train a forward model to emulate the colour change due to properties of stars and the interstellar medium. We predict the probability density function of astrophysical parameters for millions of stars individually and then construct weighted distance profiles in extinction A0 and extinction parameter R0.  Furthermore we present a non-parametric model to self-consistently predict the three-dimensional dust density in the Milky Way using a Gaussian process. Using individual extinction and distance measurements to stars and basic assumptions about the spatial correlation of the dust density we infer the most probable density at any point, even if no observations are present along that line of sight. We demonstrate the method’s ability to reliably reconstruct known dust structures with mock data.
date: 2017
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/22614/1/hanson-thesis-FINAL.pdf
identifier: DOI:10.11588/heidok.00022614
identifier: urn:nbn:de:bsz:16-heidok-226144
identifier:   Hanson, Richard James  (2017) Mapping 3D Extinction and Structures in the Milky Way.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/22614/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng