Mapping the Milky Way in 5-D with 170 Million Stars
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Speagle, Joshua S. Zucker, Catherine Bonaca, Ana Cargile, Phillip A. Johnson, Benjamin D. Beane, Angus Conroy, Charlie Finkbeiner, Douglas P. Green, Gregory M. Kamdar, Harshil M. Naidu, Rohan Rix, Hans-Walter Schlafly, Edward F. Dotter, Aaron Eadie, Gwendolyn Eisenstein, Daniel J. Goodman, Alyssa A. Han, Jiwon Jesse Saydjari, Andrew K. Ting, Yuan-Sen Zelko, Ioana A. |
| author_facet | Speagle, Joshua S. Zucker, Catherine Bonaca, Ana Cargile, Phillip A. Johnson, Benjamin D. Beane, Angus Conroy, Charlie Finkbeiner, Douglas P. Green, Gregory M. Kamdar, Harshil M. Naidu, Rohan Rix, Hans-Walter Schlafly, Edward F. Dotter, Aaron Eadie, Gwendolyn Eisenstein, Daniel J. Goodman, Alyssa A. Han, Jiwon Jesse Saydjari, Andrew K. Ting, Yuan-Sen Zelko, Ioana A. |
| contents | We present "augustus", a catalog of distance, extinction, and stellar parameter estimates to 170 million stars from $14\,{\rm mag} < r < 20\,{\rm mag}$ and with $|b| > 10^\circ$ drawing on a combination of optical to near-IR photometry from Pan-STARRS, 2MASS, UKIDSS, and unWISE along with parallax measurements from \textit{Gaia} DR2 and 3-D dust extinction maps. After applying quality cuts, we find 125 million objects have "high-quality" posteriors with statistical distance uncertainties of $\lesssim 10\%$ for objects with well-constrained stellar types. This is a substantial improvement over distance estimates derived from Gaia parallaxes alone and in line with results from previous work. We find the fits are able to accurately reproduce the de-reddened Gaia color-magnitude diagram, which serves as a useful consistency check of our results. We show that we are able to clearly detect large, kinematically-coherent substructures in our data relative to the input priors, including the Monoceros Ring and the Sagittarius stream, attesting to the quality of the catalog. Our results are publicly available at doi:10.7910/DVN/WYMSXV. An accompanying interactive visualization can be found at http://allsky.s3-website.us-east-2.amazonaws.com. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_02200 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Mapping the Milky Way in 5-D with 170 Million Stars Speagle, Joshua S. Zucker, Catherine Bonaca, Ana Cargile, Phillip A. Johnson, Benjamin D. Beane, Angus Conroy, Charlie Finkbeiner, Douglas P. Green, Gregory M. Kamdar, Harshil M. Naidu, Rohan Rix, Hans-Walter Schlafly, Edward F. Dotter, Aaron Eadie, Gwendolyn Eisenstein, Daniel J. Goodman, Alyssa A. Han, Jiwon Jesse Saydjari, Andrew K. Ting, Yuan-Sen Zelko, Ioana A. Astrophysics of Galaxies Solar and Stellar Astrophysics We present "augustus", a catalog of distance, extinction, and stellar parameter estimates to 170 million stars from $14\,{\rm mag} < r < 20\,{\rm mag}$ and with $|b| > 10^\circ$ drawing on a combination of optical to near-IR photometry from Pan-STARRS, 2MASS, UKIDSS, and unWISE along with parallax measurements from \textit{Gaia} DR2 and 3-D dust extinction maps. After applying quality cuts, we find 125 million objects have "high-quality" posteriors with statistical distance uncertainties of $\lesssim 10\%$ for objects with well-constrained stellar types. This is a substantial improvement over distance estimates derived from Gaia parallaxes alone and in line with results from previous work. We find the fits are able to accurately reproduce the de-reddened Gaia color-magnitude diagram, which serves as a useful consistency check of our results. We show that we are able to clearly detect large, kinematically-coherent substructures in our data relative to the input priors, including the Monoceros Ring and the Sagittarius stream, attesting to the quality of the catalog. Our results are publicly available at doi:10.7910/DVN/WYMSXV. An accompanying interactive visualization can be found at http://allsky.s3-website.us-east-2.amazonaws.com. |
| title | Mapping the Milky Way in 5-D with 170 Million Stars |
| topic | Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2503.02200 |