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Nearby, low-metallicity dwarf starburst galaxies hosting active galacticnuclei (AGNs) offer the best local analogs to study the early evolution ofgalaxies and their supermassive black holes (BHs). Here we present a detailedmulti-wavelength investigation of star formation and BH activity in thelow-metallicity dwarf-dwarf galaxy merger Mrk 709. Using Hubble Space TelescopeH$\alpha$ and continuum imaging combined with Keck spectroscopy, we determinethat the two dwarf galaxies are likely in the early stages of a merger (i.e.,their first pass) and discover a spectacular $\sim 10$ kpc-long string of youngmassive star clusters ($t \lesssim 10$ Myr; $M_\star \gtrsim 10^5~M_\odot$)between the galaxies triggered by the interaction. We find that the southerngalaxy, Mrk 709 S, is undergoing a clumpy mode of star formation resemblingthat seen in high-redshift galaxies, with multiple young clusters/clumps havingstellar masses between $10^7$ and $10^8~M_\odot$. Furthermore, we presentadditional evidence for a low-luminosity AGN in Mrk 709 S (first identified byReines et al. 2014 (arXiv:1405.0278) using radio and X-ray observations),including the detection of the coronal [Fe X] optical emission line. The workpresented here provides a unique glimpse into processes key to hierarchicalgalaxy formation and BH growth in the early Universe.

Clumpy Star Formation and AGN Activity in Dwarf-Dwarf Galaxy Merger Mrk 709