The Starburst-AGN Connection: Integral Field Spectroscopy of Merging and Seyfert 2 Galaxies

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Luminous galaxies can be powered by two different mechanisms, accretion of matter onto a super-massive black hole at the nucleus, and a rapid burst of star formation that produces many luminous young stars, a "starburst." Both events occur inside a large optical depth of dust: a Seyfert 2 through its dusty torus and starbursts through their dusty cocoons. Using the UIST integral field unit on the United Kingdom Infrared Telescope we make observations in the K-band where obscuration due to dust is ten times less than at visible wavelengths. With a resolution of 900 and a field of 6 x 3.3 square arcseconds, the integral field unit allows us to use infrared spectral diagnostics for a sample of galaxies identified as merging starbursts and another sample identified as Seyfert 2s to investigate the presence of both starbursts and AGNs in both samples, and look for evidence of the starburst-AGN connection.

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