Thumbnail
Access Restriction
Open

Author Schlafly, E. F. ♦ Peek, J. E. G. ♦ Finkbeiner, D. P. ♦ Green, G. M.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ♦ ABSORPTION SPECTROSCOPY ♦ CLOUDS ♦ DENSITY ♦ DISTRIBUTION ♦ EVOLUTION ♦ INFRARED SPECTRA ♦ MILKY WAY ♦ PHOTOMETRY ♦ STARS ♦ THREE-DIMENSIONAL CALCULATIONS
Abstract Near-infrared spectroscopy from APOGEE and wide-field optical photometry from Pan-STARRS1 have recently made precise measurements of the shape of the extinction curve possible for tens of thousands of stars, parameterized by R ( V ). These measurements revealed structures in R ( V ) with large angular scales, which are challenging to explain in existing dust paradigms. In this work, we combine three-dimensional maps of dust column density with R ( V ) measurements to constrain the three-dimensional distribution of R ( V ) in the Milky Way. We find that the variations in R ( V ) are correlated on kiloparsec scales. In particular, most of the dust within one kiloparsec in the outer Galaxy, including many local molecular clouds (Orion, Taurus, Perseus, California, and Cepheus), has a significantly lower R ( V ) than more distant dust in the Milky Way. These results provide new input to models of dust evolution and processing, and complicate the application of locally derived extinction curves to more distant regions of the Milky Way and to other galaxies.
ISSN 0004637X
Educational Use Research
Learning Resource Type Article
Publisher Date 2017-03-20
Publisher Place United States
Journal Astrophysical Journal
Volume Number 838
Issue Number 1


Open content in new tab

   Open content in new tab