dc.contributor.advisor | Finkbeiner, Douglas P. | |
dc.contributor.advisor | Manoharan, Vinothan | |
dc.contributor.advisor | Oberg, Karin | |
dc.contributor.author | Lee, Albert | |
dc.date.accessioned | 2019-05-20T12:24:14Z | |
dc.date.created | 2018-05 | |
dc.date.issued | 2018-05-15 | |
dc.date.submitted | 2018 | |
dc.identifier.uri | http://nrs.harvard.edu/urn-3:HUL.InstRepos:40050157 | * |
dc.description.abstract | We present a simple but effective technique for measuring angular variation in R_V across the sky. We divide stars from the Pan-STARRS catalog into Healpix pixels and determine the posterior distribution of reddening and R_V for each pixel using two independent Monte Carlo methods. We find the two methods to be self-consistent in the limits where they are expected to perform similarly. We also find some agreement with high-precision photometric studies of R_V in Perseus and Ophiuchus, as well as with a map of reddening near the galactic plane based on stellar spectra from APOGEE. While current studies of R_V are mostly limited to isolated clouds, we have developed a systematic method for comparing R_V values for the majority of observable dust. This is a proof of concept for a more rigorous galactic reddening map.
We also present a method for inferring the three dimensional variation in dust temperature. By combining extinction information from Bayestar17 and emission information from Planck and SFD, we fit a graybody model to each Healpix pixel and generate a map covering 3π steradians and distances from 0.06 kpc to 25 kpc. We compare these results to the above maps of R_V and show that it is possible to probe the physics and composition of interstellar dust by applying simple models to large data sets. | |
dc.description.sponsorship | Physics | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en | |
dash.license | LAA | |
dc.subject | Physics, Astronomy and Astrophysics | |
dc.title | Mapping the Relationship Between Interstellar Dust and Radiation in the Milky Way | |
dc.type | Thesis or Dissertation | |
dash.depositing.author | Lee, Albert | |
dc.date.available | 2019-05-20T12:24:14Z | |
thesis.degree.date | 2018 | |
thesis.degree.grantor | Graduate School of Arts & Sciences | |
thesis.degree.level | Doctoral | |
thesis.degree.name | Doctor of Philosophy | |
dc.type.material | text | |
thesis.degree.department | Physics | |
dash.identifier.vireo | http://etds.lib.harvard.edu/gsas/admin/view/2368 | |
dc.description.keywords | interstellar medium; interstellar dust; photometry; galactic structure; data analysis | |
dc.identifier.orcid | 0000-0002-1441-770X | |
dash.author.email | alberthjlee@gmail.com | |