2009/02/24 by C. Vignali, F. Pozzi, J. Fritz +11
Physics and Astronomy · #Active galactic nucleus #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Bolometer #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gamma-ray bursts and supernovae #Infrared #Line (geometry) #Line-of-sight #Optics #Physics #Quasar #Torus #astro-ph.GA
paper · pdf · doi:10.1111/j.1365-2966.2009.14675.x
7 pages, 3 figures, 1 table, accepted for publication by MNRAS
arxiv created 2009/02/24 · openalex publication_date 2009/04/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present multiwavelength observations (from optical to submillimetre, including Spitzer and Submillimetre Common-User Bolometer Array) of H2XMMJ 003357.2−120038 (also GD 15819), an X-ray selected, luminous narrow-line (type 2) quasar at z= 1.957 selected from the HELLAS2XMM survey. Its broad-band properties can be reasonably well modelled assuming three components: a stellar component to account for the optical and near-infrared (IR) emission; an active galactic nucleus (AGN) component (i.e. dust heated by an accreting active nucleus), dominant in the mid-IR, with an optical depth at 9.7 along the line of sight (close to the equatorial plane of the obscuring matter) of τ(9.7) = 1 and a full covering angle of the reprocessing matter (torus) of 140° and a far-IR starburst component (i.e. dust heated by star formation) to reproduce the wide bump observed longward of 70 . The derived star formation rate is ≈1500 M⊙ yr−1. The overall modelling indicates that GD 15819 is a high-redshift X-ray luminous, obscured quasar with coeval powerful AGN activity and intense star formation. It is probably caught before the process of expelling the obscuring gas has started, thus quenching the star formation.