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Creators/Authors contains: "Lippitt, Erin"

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  1. Abstract We identify a ∼600 pc wide region of active star formation located within a tidal streamer of M82 via Hαemission (F∼ 6.5 × 10−14erg s−1cm−2), using a pathfinder instrument based on the Dragonfly Telephoto Array. The object is kinematically decoupled from the disk of M82 as confirmed via Keck/LRIS spectroscopy and is spatially and kinematically coincident with an overdensity of Hiand molecular hydrogen within the “northern Histreamer” induced by the passage of M81 several hundred Myr ago. From Hidata, we estimate that ∼5 × 107Mof gas is present in the specific overdensity coincident with the Hαsource. The object’s derived metallicity (12+ log ( O / H ) 8.6 ), position within a gas-rich tidal feature, and morphology (600 pc diameter with multiple star-forming clumps), indicate that it is likely a tidal dwarf galaxy in the earliest stages of formation. 
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