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The optical luminous quasar PG0043+039 has not been detected before in deepX-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 deepX-ray exposure. Furthermore, we wanted to check out whether this object showsspecific spectral properties in other frequency bands. We took deep X-ray(XMM-Newton), far-ultraviolet (HST), and optical (HET, SALT telescopes) spectraof PG0043+039 simultaneously in July 2013. We just detected PG0043+039 in ourdeep X-ray exposure. The steep ${\alpha}_{ox} = -2.37 {\pm} 0.05$ gradient isconsistent 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/UVcontinuum flux has a clear maximum near 2500 {\AA}. The UV spectrum is verypeculiar because it shows broad humps in addition to known emission lines. Amodeling of these observed humps with cyclotron lines can explain theirwavelength positions, their relative distances, and their relative intensities.We derive plasma temperatures of T ${\sim}$ 3keV and magnetic field strengthsof B ${\sim}$ 2 ${\times} 10^8$ G for the line-emitting regions close to theblack hole.

Proving strong magnetic fields near to the central black hole in the quasar PG0043+039 via cyclotron lines