تقرير
INSPIRE: INvestigating Stellar Population In RElics IV. The Initial Mass Function slope in relics
| العنوان: | INSPIRE: INvestigating Stellar Population In RElics IV. The Initial Mass Function slope in relics |
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| المؤلفون: | Martin-Navarro, I., Spiniello, C., Tortora, C., Coccato, L., D'Ago, G., Ferre-Mateu, A., Pulsoni, C., Hartke, J., Arnaboldi, M., Hunt, L., Napolitano, N. R., Scognamiglio, D., Spavone, M. |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | In the last decade, growing evidence has emerged supporting a non-universal stellar Initial Mass Function (IMF) in massive galaxies, with a larger number of dwarf stars with respect to the Milky-Way (bottom-heavy IMF). However, a consensus about the mechanisms that cause IMF variations is yet to be reached. Recently, it has been suggested that stars formed early-on in cosmic time, via a star formation burst, could be characterised by a bottom-heavy IMF. A promising way to confirm this is to use relics, ultra-compact massive galaxies, almost entirely composed by these "pristine" stars. The INSPIRE Project aims at assembling a large sample of confirmed relics, that can serve as laboratory to investigate on the conditions of star formation in the first 1-3 Gyr of the Universe. In this third INSPIRE paper, we build a high signal-to-noise spectrum from five relics and one from five galaxies with similar sizes, masses, and kinematical properties, but characterised by a more extended star formation history (non-relics). Our detailed stellar population analysis suggests a systematically bottom-heavier IMF slope for relics than for non-relics, adding new observational evidence for the non-universality of the IMF at various redshifts and further supporting the above proposed physical scenario. Comment: Accepted for publication in MNRAS. 8 pages, 5 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stad503 |
| URL الوصول: | http://arxiv.org/abs/2302.06533 |
| رقم الأكسشن: | edsarx.2302.06533 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/stad503 |
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