A redline starburst: CO(2-1) observations of an Eddington-limited galaxy reveal star formation at its most extreme
Geach, J. E.; Hickox, R. C.; Diamond-Stanic, A. M.; Krips, M.; Moustakas, J.; Tremonti, C. A.; Coil, A. L.; Sell, P. H.; Rudnick, G. H.
Citation: Geach , J E , Hickox , R C , Diamond-Stanic , A M , Krips , M , Moustakas , J , Tremonti , C A , Coil , A L , Sell , P H & Rudnick , G H 2013 , ' A redline starburst: CO(2-1) observations of an Eddington-limited galaxy reveal star formation at its most extreme ' Astrophysical Journal Letters , vol 767 , no. 1 , L17 . DOI: 10.1088/2041-8205/767/1/L17
We report observations of the CO(2-1) emission of SDSS J1506+54, a compact (r(e) approximate to 135 pc) starburst galaxy at z = 0.6. SDSS J1506+ 54 appears to be forming stars close to the limit allowed by stellar radiation pressure feedback models: the measured L-IR/L-CO' approximate to 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-circle dot), low gas fraction (M-H2 /M-star approximate to 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, SDSS J1504+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.
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