Mass Distributions of z ~ 1 Galaxies: Probing Substructure and Dynamical Evidence for Bulges in Velocity Profiles

Details Mass Distributions of z ~ 1 Galaxies: Probing Substructure and Dynamical Evidence for Bulges in Velocity Profiles Mass Distributions of z ~ 1 Galaxies: Probing Substructure and Dynamical Evidence for Bulges in Velocity Profiles

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10249v&link_type=abstract

HST Proposal ID #10249

Physics

Hst Proposal Id #10249 Galaxies

Scientific paper

We propose to use the unique resolving capabilities of STIS to conduct a pilot study of the internal kinematics, structure, and star formation properties of five spiral galaxies at redshifts z 1. Our aim is to determine if these large, rapidly rotating disks have bulges in place at this epoch, and hence can be viewed as direct precursors to their local counterparts. The resolution of ground-based telescopes is insufficient to resolve velocity profiles across these galaxies on the small physical scales necessary to explore the strength of the bulge component and the level of mass-concentration in the potential core. STIS thus provides a unique opportunity to study the detailed kinematics of distant galaxies, and to probe evolution in the shape of the mass distribution. We have selected targets from a high redshift sample containing 100+ Keck+LRIS major-axis, optical rotation curves for which the [OII]3727A optical emission line has high S/N across the disk. STIS spectroscopy will be combined with existing LRIS spectroscopy and WFPC2, NICMOS and ground-based photometry to derive fundamental structural parameters {rotation velocity profile, stellar mass, mass concentration, disk scale length}, luminosities and star formation rates, and compare them with local counterparts. This will provide a stringent test of current scenarios for the formation of galactic disks and bulges.

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