The unusual spectral energy distribution of LBQS 0102-2713

TL;DR

This study analyzes the spectral energy distribution of quasar LBQS 0102-2713 across multiple wavelengths, revealing unusual UV and X-ray properties that suggest it may belong to a new class of quasars.

Contribution

It provides a detailed multiwavelength analysis of LBQS 0102-2713, highlighting its unique spectral energy distribution and proposing it as a potential new quasar class.

Findings

Alpha_ox values are -2.3 and -2.2, similar to BAL quasars.

ROSAT photon index is 6.0±1.3.

2500 A luminosity density is ten times higher than typical luminous SDSS quasars.

Abstract

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.