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The Habitability of the Galactic Bulge
Amedeo Balbi1, Maryam Hami1, Andjelka Kovačević2
1Dipartimento di Fisica, Università di Roma "Tor Vergata", Via della Ricerca Scientifica, 00133 Roma, Italy.
Life (Basel, Switzerland)
|August 7, 2020
Summary
The Milky Way bulge may be habitable, despite a harsh radiation environment and frequent supernovae. Life could potentially spread between stars via panspermia, with models estimating event rates and diffusion times.
Area of Science:
- Astronomy and Astrophysics
- Astrobiology
Background:
- The Galactic Habitable Zone concept is expanded to investigate the Milky Way bulge.
- Previous studies on bulge habitability are limited, particularly regarding unique environmental factors.
Purpose of the Study:
- To assess the habitability of the Milky Way bulge, considering factors like planet abundance, metallicity, and orbital stability.
- To analyze the impact of the central supermassive black hole and supernovae on the ionizing radiation environment.
- To evaluate the efficiency of lithopanspermia for life's diffusion in the dense bulge environment.
Main Methods:
- Review of existing knowledge on planet formation and characteristics in the galactic bulge.
- Analytical modeling of stellar density to estimate catastrophic event rates.
- Modeling of diffusion timescales for life over interstellar distances.
Main Results:
- The bulge presents a unique ionizing radiation environment due to its central black hole and high supernova rate.
- The dense stellar environment impacts orbital stability and the frequency of close encounters.
- Analytical models provide estimates for catastrophic event rates and life diffusion timescales.
Conclusions:
- The Milky Way bulge's habitability is influenced by its extreme radiation and high stellar density.
- Lithopanspermia efficiency is a key factor in assessing potential life spread within the bulge.
- Further research is needed to fully understand the conditions for life in this galactic region.
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