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A redline starburst: CO(2-1) observations of an Eddington-limited galaxy reveal star formation at its most extreme

We report observations of the CO(2-1) emission of SDSSJ1506+54, a compact (r_e~135pc) starburst galaxy at z=0.6. SDSSJ1506+54 appears to be forming stars close to the limit allowed by stellar radiation pressure feedback models: the measured L_IR/L'_CO 1500 is one of the highest measured for any galaxy. With its compact optical morphology but extended low surface brightness envelope, post-starburst spectral features, high infrared luminosity (L_IR>10^12.5 L_Sun), low gas fraction (M_H2/M_stars~15%), and short gas depletion time (tens of Myr), we speculate that this is a feedback- limited central starburst episode at the conclusion of a major merger. Taken as such, SDSSJ1504+54 epitomizes the brief closing stage of a classic model of galaxy growth: we are witnessing a key component of spheroid formation during what we term a 'redline' starburst.

preprint2013arXivOpen access
J. E. GeachR. C. HickoxA. M. Diamond-StanicM. KripsJ. MoustakasC. A. TremontiA. L. CoilP. H. SellG. H. Rudnick
astro-ph.CO
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J. E. GeachR. C. HickoxA. M. Diamond-StanicM. KripsJ. MoustakasC. A. TremontiA. L. CoilP. H. SellG. H. Rudnick

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