Probing AGN Fuelling and the Build-Up of Stellar Mass in the Center of IR Luminous Major Mergers with HST

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Major mergers are important drivers of galaxy evolution, transform spirals into massive ellipticals, are fuelling active galactic nuclei and trigger the most rapid and intense star-formation known in the universe. During a merger process, violent relaxation acts on stars present in gas-rich progenitor disks, while the centres are structured by the relics of dissipational, compact starbursts, imprinting a central "extra light" component or "cusp" into the surface brightness profiles of merger remnants. Our HST NICMOS imaging program of the 88 most luminous LIRGs in the Great Observatories All-sky LIRG Survey (GOALS) shows that the central luminosity surface density in nearby LIRGs increases significantly along the merger sequence, indicating that the gas inflow fuels a central starburst and subsequently builds a compact stellar cusp. We will examine the relation between the cusp luminosity (central starburst) and AGN activity (as measured by our mid-IR line spectroscopy diagnostics), and discuss its implication for SMBH growth and AGN fuelling.

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