Proving strong magnetic fields near to the central black hole in the
  quasar PG0043+039 via cyclotron lines
  The optical luminous quasar PG0043+039 has not been detected before in deep
X-ray observations indicating the most extreme optical-to-X-ray slope index
${\alpha}_{ox}$ of all quasars. This study aims to detect PG0043+039 in a deep
X-ray exposure. Furthermore, we wanted to check out whether this object shows
specific spectral properties in other frequency bands. We took deep X-ray
(XMM-Newton), far-ultraviolet (HST), and optical (HET, SALT telescopes) spectra
of PG0043+039 simultaneously in July 2013. We just detected PG0043+039 in our
deep X-ray exposure. The steep ${\alpha}_{ox} = -2.37 {\pm} 0.05$ gradient is
consistent with an unusual steep gradient $F_{\nu} {\sim} {\nu}^{\alpha}$ with
${\alpha} = -2.67 {\pm} 0.02$ seen in the UV/far-UV continuum. The optical/UV
continuum flux has a clear maximum near 2500 {\AA}. The UV spectrum is very
peculiar because it shows broad humps in addition to known emission lines. A
modeling of these observed humps with cyclotron lines can explain their
wavelength positions, their relative distances, and their relative intensities.
We derive plasma temperatures of T ${\sim}$ 3keV and magnetic field strengths
of B ${\sim}$ 2 ${\times} 10^8$ G for the line-emitting regions close to the
black hole.
