Stellar Populations And Galactic Outflows At z ∼ 3

Details Stellar Populations And Galactic Outflows At z ∼ 3 Stellar Populations And Galactic Outflows At z ∼ 3

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21911103m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #111.03

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Scientific paper

We have measured a velocity offset between the Lyman-α emission line and the [OIII] nebular emission line in three spectroscopically confirmed z 3.1 Lyman-α emitting galaxies (LAEs). Such velocity offsets indicate the presence of powerful outflows in these galaxies. We made these measurements by combining near-infrared spectroscopy of the [OIII] line (from LBT/LUCIFER) with optical spectroscopy of the Lyman-α line (from MMT/Hectospec). We contend that tracing the kinematics of these galaxies is crucial for understanding how the prominent Ly-α emission from these galaxies is produced and how it escapes. LAEs are an exciting tool for studying the early universe, as Lyman-α emission is a prominent sign of young star forming galaxies at high redshift. It can be used to identify galaxy samples with characteristic continuum luminosities and stellar masses well below those typically obtained from Lyman break selection or other high-redshift galaxy search methods.
To further understand what these young, low-mass objects tell us about galaxy formation, assembly, and evolution we have used our NIR spectroscopic data to demonstrate how the [OIII] emission line in the Ks filter alters SED fitting results of our z 3.1 LAEs. This information allows us to produce more accurate SED fits of those LAEs with NIR data, and predict [OIII] line fluxes in those LAEs that have yet to be observed in the NIR. Our SED fitting sample of 30 confirmed z 3.1 LAEs is one of the largest produced to date and provides a powerful look at accurate ages, masses, metallicities, dust characteristics and star formation histories of these early galaxies.

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