The Stelar Mass Growth of Galaxies between z 8 and z 4

Details The Stelar Mass Growth of Galaxies between z 8 and z 4 The Stelar Mass Growth of Galaxies between z 8 and z 4

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21912903g&link_type=abstract

American Astronomical Society, AAS Meeting #219, #129.03

Astronomy and Astrophysics

Astronomy

Scientific paper

The recent deep and ultra-deep surveys with the HST WFC3/IR camera have resulted in the deepest ever near-IR images. Combined with the deepest optical images from the HST ACS camera, and the deep wide area Spitzer/IRAC mid-IR images from the GOODS-S, these represent a remarkable dataset that has produced very large samples of high redshift galaxies over a wide range of luminosities. From this dataset it has been possible to obtain fairly robust estimates of the properties of these galaxies, in particular, their star formation rates and stellar masses. Early results include the realisation that in high-z Lyman Break Galaxies the total SFR correlates with the Stellar Mass. This "main sequence" of star forming galaxies has been observed at lower redshifts but contrary to what is observed there, this relation does not seem to evolve at z>4-7, which posses an interesting puzzle to theory, sometimes referred to as the specific SFR plateau. This dataset has also resulted in the best estimates of the galaxy stellar mass functions at z 4-7 which now places interesting constraints on numerical simulations, particularly at low masses ( 108 Msun). The integral of these stellar mass functions also provide estimates of the stellar mass density of the Universe at different redshifts that can be compared to the values expected from the UV-derived star formation rate densities. In this presentation I will review these results including the latest progress and will discuss what these observations suggest regarding the way in which galaxies grew in the early Universe.

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