Submillimetre photometry of X-ray absorbed QSOs: their formation and evolutionary status

Details Submillimetre photometry of X-ray absorbed QSOs: their formation and evolutionary status Submillimetre photometry of X-ray absorbed QSOs: their formation and evolutionary status

2005-03-29

arxiv.org/abs/astro-ph/0503618v1

Mon.Not.Roy.Astron.Soc. 360 (2005) 610-618

Astronomy and Astrophysics

Astrophysics

MNRAS in press, 9 pages, 4 figs

Scientific paper

10.1111/j.1365-2966.2005.09051.x

We present an analysis of the submillimetre/X-ray properties of 19 X-ray absorbed, Compton-thin quasi-stellar objects (QSOs) selected to have luminosities and redshifts which represent the peak of cosmic QSO activity. i.e. ~L* objects at 11.5, the high star formation rates are consistent with a scenario in which the QSOs evolve to become local luminous elliptical galaxies. Combining these results with previously published data for X-ray unabsorbed QSOs and submillimetre-selected galaxies we propose the following evolutionary sequence: the forming galaxy is initially far-infrared luminous but X-ray weak similar to the sources discovered by the Submillimetre Common-User Bolometer Array; as the black hole and spheroid grow with time a point is reached when the central QSO becomes powerful enough to terminate the star formation and eject the bulk of the fuel supply (the Compton-thin absorbed QSO phase); this transition is followed by a period of unobscured QSO activity which subsequently declines to leave a quiescent spheroidal galaxy.

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