Highly-excited CO emission in APM08279+5255 at z=3.9

摘要: We report the detection of CO 4-3, 6-5, 9-8, 10-9, and 11-10 lines in Broad Absorption Line quasar APM08279+5255 at z=3.9 using IRAM 30m telescope. also present PdBI high spatial resolution observations 4-3 9-8 lines, 1.4mm dust radiation as well an improved spectrum HCN(5-4) line. Unlike other QSO host galaxies, line SED rises up to CO(10-9) transition. The fluxes ladder continuum are best fit by a two component model, "cold" ~65K with density n(H2)= 1x10^5 cm^-3, "warm", ~220K 1x10^4 cm^-3. show that IR pumping via 14 micron bending mode HCN is most likely channel for excitation. From our models we find, CO(1-0) emission dominated {\it dense} gas which implies conversion factor higher than usually assumed high-z galaxies alpha~5 SM/(K km/s pc^2). Using brightness temperature arguments, results from high-resolution mapping, lens literature, argue molecular arise very compact (r~100-300 pc), highly gravitationally magnified (m= 60-110) region surrounding central AGN. Part difference relative high-$z$ QSOs may therefore be due configuration gravitational lens, gives us high-magnification zoom right into 200-pc radius where plays significant role excitation lines.