NDLI: THE FORMATION OF MILKY WAY–MASS DISK GALAXIES IN THE FIRST 500 MILLION YEARS OF A COLD DARK MATTER UNIVERSE

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THE FORMATION OF MILKY WAY–MASS DISK GALAXIES IN THE FIRST 500 MILLION YEARS OF A COLD DARK MATTER UNIVERSE

Content Provider	Scilit
Author	Feng, Yu DiMatteo, Tiziana Croft, Rupert A. C. Tenneti, Ananth Bird, Simeon Battaglia, Nicholas Wilkins, Stephen
Copyright Year	2015
Description	Journal: The Astrophysical Journal Letters Whether or not among the myriad tiny protogalaxies there exists a population with similarities to present-day galaxies is an open question. We show, using BlueTides, the first hydrodynamic simulation large enough to resolve the relevant scales, that the first massive galaxies to form are predicted to have extensive rotationally supported disks. Although their morphology resembles in some ways Milky Way types seen at much lower redshifts, these high-redshift galaxies are smaller, denser, and richer in gas than their low-redshift counterparts. From a kinematic analysis of a statistical sample of 216 galaxies at redshift z = 8–10, we have found that disk galaxies make up 70% of the population of galaxies with stellar mass or greater. Cold dark matter cosmology therefore makes specific predictions for the population of large galaxies 500 million years after the Big Bang. We argue that wide-field satellite telescopes (e.g., WFIRST) will in the near future discover these first massive disk galaxies. The simplicity of their structure and formation history should make new tests of cosmology possible.
Related Links	http://iopscience.iop.org/article/10.1088/2041-8205/808/1/L17/pdf
ISSN	20418205
DOI	10.1088/2041-8205/808/1/l17
Journal	The Astrophysical Journal Letters
Issue Number	1
Volume Number	808
Language	English
Publisher	IOP Publishing
Publisher Date	2015-07-20
Access Restriction	Open
Subject Keyword	Journal: The Astrophysical Journal Letters Astronomy and Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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