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The First Galaxies and the Likely Discovery of Their Fossils in the Local Group
Author
Source
Issue
Vol. 2010, Issue 2010 (31 Dec. 2010), pp.1-21, 21 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2010-02-24
Country of Publication
Egypt
No. of Pages
21
Main Subjects
Abstract EN
The lower bound for the mass of a galaxy is unknown, as are the typical luminosity of the smallest galaxies and their numbers.
The answers depend on the extent to which star formation in the first population of small mass halos may be suppressed by radiative feedback loops.
If early populations of dwarf galaxies did form in significant number before reionization, their “fossils” should be found today in the Local Group.
This paper reviews our ongoing efforts to simulate and identify fossil dwarfs in the Local Group.
It is widely believed that reionization stopped star formation in fossil dwarfs.
However, here we dispute this idea and discuss a physical mechanism whereby recent episodes of star formation would be produced in some fossil dwarfs that, hence, may characterized by a bimodal star formation history.
The same mechanism could turn dark halos that failed to form stars before reionization into gas-rich “dark galaxies”.
We believe that current observational data supports the thesis that a fraction of the new ultra-faint dwarfs discovered in the Local Group are fossil dwarfs and we predict the existence of a population of ultra-faint dwarfs with lower surface brightness than currently observed.
American Psychological Association (APA)
Ricotti, Massimo. 2010. The First Galaxies and the Likely Discovery of Their Fossils in the Local Group. Advances in Astronomy،Vol. 2010, no. 2010, pp.1-21.
https://search.emarefa.net/detail/BIM-459213
Modern Language Association (MLA)
Ricotti, Massimo. The First Galaxies and the Likely Discovery of Their Fossils in the Local Group. Advances in Astronomy No. 2010 (2010), pp.1-21.
https://search.emarefa.net/detail/BIM-459213
American Medical Association (AMA)
Ricotti, Massimo. The First Galaxies and the Likely Discovery of Their Fossils in the Local Group. Advances in Astronomy. 2010. Vol. 2010, no. 2010, pp.1-21.
https://search.emarefa.net/detail/BIM-459213
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-459213