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Properties of the molecular gas in a starbursting QSO at z=1.83 in the COSMOS field by Aravena, Manuel; Bertoldi, Frank; Schinnerer, Eva; Weiss, Axel; Jahnke, Knud; Carilli, Chris L.; Frayer, David T.; Henkel, Christian; Brusa, Marcella; Menten, Karl M.; Salvato, Mara; Smolcic, Vernesa is a scholarly article available to read on EtoBox.

What is Properties of the molecular gas in a starbursting QSO at z=1.83 in the COSMOS field about?

Using the IRAM 30m telescope, we have detected the CO J=2-1, 4-3, 5-4, and 6-5 emission lines in the millimeter-bright, blank-field selected AGN COSMOS J100038+020822 at redshift z=1.8275. The sub-local thermodynamic equilibrium (LTE) excitation of the J=4 level implies that the gas is less excited than that in typical nearby starburst galaxies such as NGC253, and in the high-redshift quasars studied to date, such as J1148+5251 or BR1202-0725. Large velocity gradient (LVG) modeling of the CO line spectral energy distribution (CO SED; flux density vs. rotational quantum number) yields H2 densities in the range 10^{3.5}--10^{4.0} cm-3, and kinetic temperatures between 50 K and 200 K. The H2 mass of (3.6 - 5.4) x 10^{10} M_sun implied by the line intensities compares well with our estimate of the dynamical mass within the inner 1.5 kpc of the object. Fitting a two-component gray body spectrum, we find a dust mass of 1.2 x 10^{9} M_sun, and cold and hot dust temperatures of 42+/-5 K and 160+/-25 K, respectively. The broad MgII line allows us to estimate the mass of the central black hole as 1.7 x 10^{9} M_sun. Although the optical spectrum and multi-wavelength SED matches those of an a

Author

Aravena, Manuel; Bertoldi, Frank; Schinnerer, Eva; Weiss, Axel; Jahnke, Knud; Carilli, Chris L.; Frayer, David T.; Henkel, Christian; Brusa, Marcella; Menten, Karl M.; Salvato, Mara; Smolcic, Vernesa

Published

2008

Language

EN