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We present HST UV/optical imaging, Spitzer mid-IR photometry, and opticalspectroscopy of a sample of 30 low-redshift (z=0.1-0.3) galaxies chosen fromSDSS/GALEX to be accurate local analogs of the high-z Lyman Break Galaxies. TheLyman Break Analogs (LBAs) are similar in mass, metallicity, dust, SFR, sizeand gas velocity dispersion, thus enabling a detailed investigation ofprocesses that are important at high-z. The optical emission line properties ofLBAs are also similar to those of LBGs, indicating comparable conditions intheir ISM. In the UV, LBAs are characterized by complexes of massivestar-forming "clumps", while in the optical they most often show evidence for(post-)mergers/interactions. In 6 cases, we find an extremely massive (>10^9Msun) compact (R~100 pc) dominant central object (DCO). The DCOs arepreferentially found in LBAs with the highest mid-IR luminosities andcorrespondingly high SFRs (15-100 Msun/yr). We show that the massive SF clumps(including the DCOs) have masses much larger than the nuclear super starclusters seen in normal late type galaxies. However, the DCOs have masses,sizes, and densities similar to the excess-light/central-cusps seen in typicalelliptical galaxies with masses similar to the LBA galaxies. We suggest thatthe DCOs form in present-day examples of the dissipative mergers at highredshift that are believed to have produced the central-cusps in localellipticals. More generally, the properties of the LBAs are consistent with theidea that instabilities in a gas-rich disk lead to very massive star-formingclumps that eventually coalesce to form a spheroid. We speculate that the DCOsare too young at present to be growing a supermassive black hole because theyare still in a supernova-dominated outflow phase.

astrophysical journal/the astrophysical journal

Local Lyman Break Galaxy Analogs: The Impact of Massive Star-forming  Clumps on the Interstellar Medium and the Global Structure of Young, Forming  Galaxies