The unusual spectral energy distribution of LBQS 0102-2713

Details The unusual spectral energy distribution of LBQS 0102-2713 The unusual spectral energy distribution of LBQS 0102-2713

2009-05-06

arxiv.org/abs/0905.0808v1

Astrophys.J.699:732-741,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

16 pages, 8 figures, accepted by ApJ

Scientific paper

10.1088/0004-637X/699/1/732

We have studied the SED of the quasar LBQS 0102-2713. The available multiwavelength data are one optical spectrum between 3200 and 7400 A, 7 HST FOS spectra between 1700 and 2300 A, one GALEX NUV flux density and a K_S magnitude obtained from NED, and 3 public ROSAT PSPC pointed observations in the 0.1$-$2.4 keV energy band. The alpha_ox values obtained are -2.3 and -2.2, respectively, comparable to BAL quasars. The ROSAT photon index is 6.0+-1.3. The 2500 A luminosity density is about a factor of 10 higher compared to the mean of the most luminous SDSS quasars. We argue that the object might be indicative for a new class of quasars with an unusual combination in their UV-, X-ray, and N_H properties.

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