A&A 480, 69-77 (2008)
Slit and integral-field optical spectroscopy of the enigmatic quasar HE 0450-2958G. Letawe1, P. Magain1, and F. Courbin2
1 Institut d'Astrophysique et Géophysique, Université de Liège, Allée du 6 Août, 17 Bâtiment B5C, 4000 Liège, Belgium
2 Laboratoire d'Astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire, 1290 Sauverny, Switzerland
(Received 24 September 2007 / Accepted 3 December 2007)
Context.Interest in the quasar HE 0450-2958 arose following the publication of the non-detection of its expected massive host, leading to various interpretations.
Aims.This article investigates the gaseous and stellar contents of the system through additional VLT/FORS slit spectra and integral field spectroscopy from VLT/VIMOS.
Methods.We apply our MCS deconvolution algorithm on slit spectra for the separation of the QSO and diffuse components, and develop a new method to remove the point sources in Integral Field Spectra, allowing extraction of velocity maps, narrow-line images, spatially resolved spectra or ionization diagrams of the surroundings of HE 0450-2958.
Results.The whole system is embedded in gas, mostly ionized by the QSO radiation field and shocks associated with radio jets. The observed gas and star dynamics are unrelated, revealing a strongly perturbed system. Despite longer spectroscopic observations, the host galaxy remains undetected.
Key words: galaxies: active -- quasars: individual: HE 0450-2958
© ESO 2008