Exploring the nature of z<1 Ultraviolet Luminous Galaxies (UVLGs): Local analogs of Lyman Break Galaxies

Details Exploring the nature of z<1 Ultraviolet Luminous Galaxies (UVLGs): Local analogs of Lyman Break Galaxies Exploring the nature of z<1 Ultraviolet Luminous Galaxies (UVLGs): Local analogs of Lyman Break Galaxies

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phdt........13b&link_type=abstract

Proquest Dissertations And Theses 2009. Section 0054, Part 0606 150 pages; [Ph.D. dissertation].United States -- New York: Colu

Other

Ultraviolet, Galaxies, Starburst, Star Formation

Scientific paper

Many studies have focused on the nature of high-redshift (z>2) UV-selected galaxies ( i.e. Lyman Break Galaxies (LBGs) and Lyman Alpha Emitters (LAEs)) in order to understand what causes their intense star formation and to gain understanding about the formation and evolution of galaxies. However, as distant galaxies, observations of these galaxies require time-consuming, deep coverage in order to sufficiently study their properties. GALEX has identified a population of z<1 galaxies. Ultraviolet Luminous Galaxies (UVLGs)--a subset, the supercompact UVLGs (ScUVLGs), are remarkably similar to LBGs in most physical properties. As local LBG-analogs. ScUVLGs present an opportunity for studying details of galaxy formation in the early Universe with very high physical resolution and sensitivity: as unique and extreme star-forming systems in the local universe, ScUVLGs merit detailed study.
In this thesis, we have studied diverse properties of these galaxies: (1) their environments, (2) the dynamics and kinematics of their ionized gas, and (3) their star formation histories and dust attenuation properties.
We find evidence of interactions both statistically, through our study of UVLG environment, and from the kinematics of ScUVLGs, using integral field spectroscopy of the Paa emission line. We conclude that mergers play an important role in triggering star formation in these galaxies.
In our study of the dust attenuation and underlying stellar populations in this sample, we find that the scUVLGs have less dust attenuation, given their star formation rates (SFRs), than other nearby (z~0.2) star-forming galaxies and star formation histories consistent with continuous SFR. Our results reinforce the connection to high-z LBGs, and distinguish UVLGs as unique systems in the local universe.
Finally, in a separate project, we discovered an obscured AGN in a z=3.09 Lyman Alpha Blob (LAB), using Chandra X-ray data. The origin of Lya emission in LABs is poorly understood, but they are often found near LBGs and may be important objects for understanding structure formation.

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