The Stellar Mass Function of Disks and Bulges at z = 1

Details The Stellar Mass Function of Disks and Bulges at z = 1 The Stellar Mass Function of Disks and Bulges at z = 1

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hst..prop10651f&link_type=abstract

HST Proposal ID #10651

Computer Science

Hst Proposal Id #10651 Cosmology

Scientific paper

The disks of galaxies are thought to form quiescently, while bulges form in mergers. Measuring the amount of mass in bulges and disks separately therefore determines the relative importance of these two formation channels versus time. This proposal would exploit a unique multiwavelength database to measure the total stellar mass functions of red and blue galaxies down to 1 billion solar masses at z = 1, and obtain the first measurement of the mass functions of bulges and disks SEPARATELY at that redshift. The cornerstone of the project is a set of parallel NIC3 images in the Extended Groth Strip, which is unique among Hubble near-IR imaging surveys and is much more sensitive to old stellar components than ACS V or I. NIC3 photometry will be used to improve and deepen IRAC photometry and to measure accurate photo-z's for faint galaxies far below the spectroscopy limit. ACS and NIC3 images together will be used to construct SEDs separately for bulge and disk components to determine bulge-to-disk mass ratios of individual galaxies and, from them, mass functions. The data will go deep enough to reveal any faint population of red galaxies at z = 1, and will provide the first measurement of disk-radius evolution based on underlying old stars. High Level Data Products will be created to distribute all catalogs to the public.

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