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19 April 2024 |
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Article overview
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Is There a Missing Galaxy Problem at High Redshift? | | Kentaro Nagamine
; Renyue Cen
; Lars Hernquist
; Jeremiah P. Ostriker
; Volker Springel
; | | Date: |
13 Nov 2003 | | Journal: | Astrophys.J. 610 (2004) 45-50 | | Subject: | astro-ph | | Affiliation: | 2,3), Volker Springel ( Harvard-CfA, Princeton, IoA Cambridge, MPA | | Abstract: | We study the evolution of the global stellar mass density in a Lambda cold dark matter universe using two different types of hydrodynamical simulations (Eulerian TVD and SPH) and the analytical model of Hernquist & Springel (2003). We find that the theoretical calculations all predict both a higher stellar mass density at z~3 than indicated by current observations, and that the peak of the cosmic star formation rate history should lie at z~5. Such a star formation history implies that as much as (70%, 30%) of the total stellar mass density today must already have formed by z=(1, 3). Our results suggest that current observations at z~3 are missing as much as 50% of the total stellar mass density in the Universe, perhaps owing to an inadequate allowance for dust obscuration in star-forming galaxies, limited sample sizes, or cosmic variance. We also compare our results with some of the updated semi-analytic models of galaxy formation. | | Source: | arXiv, astro-ph/0311294 | | Services: | Forum | Review | PDF | Favorites | |
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