Predicting the locations of possible long-lived low-mass first stars: importance of satellite dwarf galaxies
The search for metal-free stars has so far been unsuccessful, proving that if there are surviving stars from the first generation, they are rare, they have been polluted or we have been looking in the wrong place. To predict the likely location of Population III (Pop III) survivors, we semi-analytic...
| Main Authors: | , , , , , , |
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| Format: | Article |
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Oxford University Press (OUP)
2019
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| Online Access: | https://hdl.handle.net/1721.1/121256 |
| _version_ | 1826196974368456704 |
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| author | Magg, Mattis Hartwig, Tilman Agarwal, Bhaskar Frebel, Anna L. Glover, Simon C. O. Griffen, Brendan F. Klessen, Ralf S. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Magg, Mattis Hartwig, Tilman Agarwal, Bhaskar Frebel, Anna L. Glover, Simon C. O. Griffen, Brendan F. Klessen, Ralf S. |
| author_sort | Magg, Mattis |
| collection | MIT |
| description | The search for metal-free stars has so far been unsuccessful, proving that if there are surviving stars from the first generation, they are rare, they have been polluted or we have been looking in the wrong place. To predict the likely location of Population III (Pop III) survivors, we semi-analytically model early star formation in progenitors of Milky Way-like galaxies and their environments. We base our model on merger trees from the high-resolution dark matter only simulation suite Caterpillar. Radiative and chemical feedback are taken into account self-consistently, based on the spatial distribution of the haloes. Our results are consistent with the non-detection of Pop III survivors in the MilkyWay today.We find that possible surviving Pop III stars are more common in Milky Way satellites than in the main Galaxy. In particular, low-mass Milky Way satellites contain a much larger fraction of Pop III stars than the Milky Way. Such nearby, low-mass Milky Way satellites are promising targets for future attempts to find Pop III survivors, especially for high-resolution, high signal-to-noise spectroscopic observations.We provide the probabilities of finding a Pop III survivor in the red giant branch phase for all known Milky Way satellites to guide future observations. Keywords: stars: Population III; Local Group; dark ages; reionization; first stars; early universe |
| first_indexed | 2024-09-23T10:40:48Z |
| format | Article |
| id | mit-1721.1/121256 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T10:40:48Z |
| publishDate | 2019 |
| publisher | Oxford University Press (OUP) |
| record_format | dspace |
| spelling | mit-1721.1/1212562022-09-30T22:13:26Z Predicting the locations of possible long-lived low-mass first stars: importance of satellite dwarf galaxies Magg, Mattis Hartwig, Tilman Agarwal, Bhaskar Frebel, Anna L. Glover, Simon C. O. Griffen, Brendan F. Klessen, Ralf S. Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research The search for metal-free stars has so far been unsuccessful, proving that if there are surviving stars from the first generation, they are rare, they have been polluted or we have been looking in the wrong place. To predict the likely location of Population III (Pop III) survivors, we semi-analytically model early star formation in progenitors of Milky Way-like galaxies and their environments. We base our model on merger trees from the high-resolution dark matter only simulation suite Caterpillar. Radiative and chemical feedback are taken into account self-consistently, based on the spatial distribution of the haloes. Our results are consistent with the non-detection of Pop III survivors in the MilkyWay today.We find that possible surviving Pop III stars are more common in Milky Way satellites than in the main Galaxy. In particular, low-mass Milky Way satellites contain a much larger fraction of Pop III stars than the Milky Way. Such nearby, low-mass Milky Way satellites are promising targets for future attempts to find Pop III survivors, especially for high-resolution, high signal-to-noise spectroscopic observations.We provide the probabilities of finding a Pop III survivor in the red giant branch phase for all known Milky Way satellites to guide future observations. Keywords: stars: Population III; Local Group; dark ages; reionization; first stars; early universe National Science Foundation (U.S.) (Grant AST-1255160) 2019-06-12T17:37:25Z 2019-06-12T17:37:25Z 2018-02 2017-09 2019-03-22T14:17:00Z Article http://purl.org/eprint/type/JournalArticle 0035-8711 1365-2966 https://hdl.handle.net/1721.1/121256 Magg, Mattis et al. “Predicting the Locations of Possible Long-Lived Low-Mass First Stars: Importance of Satellite Dwarf Galaxies.” Monthly Notices of the Royal Astronomical Society 473, 4 (October 2017): 5308–5323 © 2017 The Authors http://dx.doi.org/10.1093/MNRAS/STX2729 Monthly Notices of the Royal Astronomical Society Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Oxford University Press (OUP) arXiv |
| spellingShingle | Magg, Mattis Hartwig, Tilman Agarwal, Bhaskar Frebel, Anna L. Glover, Simon C. O. Griffen, Brendan F. Klessen, Ralf S. Predicting the locations of possible long-lived low-mass first stars: importance of satellite dwarf galaxies |
| title | Predicting the locations of possible long-lived low-mass first stars: importance of satellite dwarf galaxies |
| title_full | Predicting the locations of possible long-lived low-mass first stars: importance of satellite dwarf galaxies |
| title_fullStr | Predicting the locations of possible long-lived low-mass first stars: importance of satellite dwarf galaxies |
| title_full_unstemmed | Predicting the locations of possible long-lived low-mass first stars: importance of satellite dwarf galaxies |
| title_short | Predicting the locations of possible long-lived low-mass first stars: importance of satellite dwarf galaxies |
| title_sort | predicting the locations of possible long lived low mass first stars importance of satellite dwarf galaxies |
| url | https://hdl.handle.net/1721.1/121256 |
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