Other
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..783..394w&link_type=abstract
THE EVOLUTION OF STARBURSTS: The 331st Wilhelm and Else Heraeus Seminar. AIP Conference Proceedings, Volume 783, pp. 394-400 (2
Other
2
Galaxies, Interstellar Matter, Gases, Star Formation, Starburst Galaxies And Infrared Excess Galaxies, Atomic, Molecular, Chemical, And Grain Processes
Scientific paper
We present high-resolution VLA observations of the molecular gas in the host galaxy of the highest redshift quasar currently known, SDSS J1148+5251 (z=6.42). Our VLA data of the CO(3-2) emission have a maximum resolution of 0.''17 × 0.''13 (<=1 kpc), and enable us to resolve the molecular gas emission both spatially and in velocity. The molecular gas in J1148+5251 is extended to a radius of 2.5 kpc, and the central region shows 2 peaks, separated by 0.''3 (1.7 kpc). These peaks account for about half of the total emission, while the remainder is more extended. Each of these unresolved peaks contains a molecular gas mass of ~ 5 × 109 Msolar (similar to the total mass found in nearby ULIRGS) and has an intrinsic brightness temperature of ~ 35 K (averaged over the 1 kpc-sized beam), comparable to what is found in nearby starburst centers. Assuming that the molecular gas is gravitationally bound, we estimate a dynamical mass of ~ 4.5 × 1010 Msolar within a radius of 2.5 kpc (~ 5.5 × 1010 Msolar if corrected for a derived inclination of i ~ 65°). This dynamical mass estimate leaves little room for matter other than the detected molecular gas, and in particular the data are inconsistent with a ~ 1012 Msolar stellar bulge which would be predicted based on the MBH - σbulge relation. The presence of abundant molecular gas in the host galaxy of SDSS J1148+5251 provides strong evidence that massive star formation is going on in this system (~ 870 Myr after the Big Bang).
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