The following document lists the file abstract/JCLAVEL_BALQSO_R.abs
from catalogue VI/111.
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===================================================================== ===================================================================== I propose ISOCAM observations of the recently identified and truly unique QSO 1556+3517 (z = 1.48). Indeed, 1556+3517 is to date the only broad absorption line (BAL) QSO which is also a genuine and powerful radio source. Other peculiarities of 1556+3517 are (1) it belongs to the relatively rare sub-class of low ionisation BAL QSOs (2) it shows absorption lines from metastable levels of iron (3) its optical spectrum is very red. All these properties suggest that 1556+3517 is a proto-QSO caught in a very early stage of evolution when the source is still shrouded by a thick and hardly ionized cocoon of dust and gas. Moreover, by being the only source which combines the mutually exclusive properties of radio-loudness and BAL, 1556+3517 may yield clues as to the origin of both phenomena. The ISOCAM observations are aimed at measuring the thickness of the dust cocoon and studying the environment of the nuclear source, searching in particular for signs of galactic scale burst of star formation, cooling flows or merging, which may all be related to the onset of nuclear activity.