Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 479, Issue 1, Pages 900-916Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty1454
Keywords
Galaxy: centre; gamma-rays: galaxies; X-rays: galaxies; cataclysmic variables; pulsars: general; dark matter
Categories
Funding
- German Research Foundation (DFG) [Sonderforschungsbereich SFB 881]
- University of Rome Sapienza [52/2015]
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme ERC-2014-STG [638435]
- Hungarian National Research, Development, and Innovation Office [NKFIH KH-125675]
- National Science Foundation [PHY-1607761]
Ask authors/readers for more resources
The Milky Way centre exhibits an intense flux in the gamma and X-ray hands, whose origin is partly ascribed to the possible presence of a large population of millisecond pulsars (MSPs) and cataclysmic variables (CVs), respectively. However, the number of sources required to generate such an excess is much larger than what is expected from in situ star formation and evolution, opening a series of questions about the formation history of the Galactic nucleus. In this paper, we make use of direct N-body simulations to investigate whether these sources could have been brought to the Galactic centre by a population of star clusters that underwent orbital decay and formed the Galactic nuclear star cluster (NSC). Our results suggest that the gamma-ray emission is compatible with a population of MSPs that were mass segregated in their parent clusters, while the X-ray emission is consistent with a population of CVs born via dynamical interactions in dense star clusters. Combining observations with our modelling, we explore how the observed gamma-ray flux can be related to different NSC formation scenarios. Finally, we show that the high-energy emission coining from the galactic central regions can be used to detect black holes heavier than 10(5) M-circle dot in nearby dwarf galaxies.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available