Astrophys. J., 528, 626-636 (2000/January-2)
CO (4-3) and dust emission in two powerful high-z radio galaxies, and CO lines at high redshifts.
PAPADOPOULOS P.P., ROETTGERING H.J.A., VAN DER WERF P.P., GUILLOTEAU S., OMONT A., VAN BREUGEL W.J.M. and TILANUS R.P.J.
Abstract (from CDS):
We report the detection of submillimeter emission from dust at 850 µm and of the 12CO J=4-3 line in the two distant powerful radio galaxies 4C 60.07 (z=3.79) and 6C 1909+722 (z=3.53). In 4C 60.07, the dust emission is also detected at 1.25 mm. The estimated molecular gas masses are large, of the order of ~(0.5-1)x1011 M☉. The large far-infrared (FIR) luminosities (LFIR∼1013 L☉) suggest that we are witnessing two major starburst phenomena, while the observed large velocity widths (ΔVFWHM≳500 km.s–1) are characteristic of mergers. In the case of 4C 60.07, the CO emission extends over ∼30 kpc and spans a velocity range of ≳1000 km.s–1. It consists of two distinct features with FWHM of ≳550 km.s–1 and ∼150 km.s–1, and line centers separated by ≳700 km.s–1. The least massive of these components is probably very gas rich, with potentially ≳60% of its dynamical mass in the form of molecular gas. The extraordinary morphology of the CO emission in this object suggests that it is not just a scaled-up version of a local ultraluminous infrared galaxy, and it may be a formative stage of the elliptical host of the residing radio-loud active galactic nucleus (AGN). Finally, we briefly explore the effects of the wide range of gas-excitation conditions expected for starburst environments on the luminosity of high-J CO lines and conclude that in unlensed objects, CO (J+1⟶J), J+1>3 lines can be significantly weak with respect to CO J=1-0, and this can hinder their detection even in the presence of substantial molecular gas masses.
Galaxies: Active - Galaxies: Formation - Galaxies: Individual: Alphanumeric: 4C 60.07 - Galaxies: Individual: Alphanumeric: 6C 1909+722 - Galaxies: ISM
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