Jarvis, MJ; van Breukelen, C; Wilman, RJ; (2005) The discovery of a type II quasar at z= 1.65 with integral-field spectroscopy. Monthly Notices of the Royal Astronomical Society , 358 (1) L11 - L15. 10.1111/j.1745-3933.2005.00017.x.

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Abstract

In this Letter we report the serendipitous discovery of a genuine type II quasar at ɀ = 1.65 using integral-field data from the Visual Multi-Object Spectrograph (VIMOS) on the Very Large Telescope (VLT). This is the first discovery of a type II quasar at ɀ > 1 from optical data alone. J094531-242831, hereafter J0945-2428, exhibits strong narrow (v < 1500 km s−1) emission lines, has a resolved host galaxy, and is undetected to a radio flux density limit of S5 GHz = 0.15 mJy (3σ). All of these characteristics lead us to believe that J0945-2428 is a bona fide type II quasar. The luminosity of the narrow emission lines in this object suggest that the intrinsic power of the central engine is similar to that found in powerful radio galaxies, indicative of a similarly large supermassive black hole of ∼ 3 × 108 M⊙ (assuming that it is accreting at its Eddington limit). However, from near-infrared imaging observations we find that the old stellar population in the host galaxy has a luminosity of ∼ 0.2 L★, mildly inconsistent with the correlation between black hole mass and bulge luminosity found locally, although the uncertainty in the black hole mass estimate is large. This discovery highlights the power that integral-field units have in discovering hidden populations of objects, particularly the sought-after type II quasars, which are invoked to explain the hard X-ray background. As such, future large integral-field surveys could open up a new window on the obscured accretion activity in the Universe.

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