Abstract
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.
Highlights
Active galactic nuclei (AGNs) emit enormous luminosities at all frequency ranges from the radio to the X-ray regime
We wanted to test whether PG0043+039 shows additional special spectral properties
We indicate the identifications of the strongest UV emission lines Lyα, O vi λ1038, etc., of the geo-coronal lines, as well as of other emission lines that we attribute to two cyclotron systems A and B with their second to seventh harmonics
Summary
Active galactic nuclei (AGNs) emit enormous luminosities at all frequency ranges from the radio to the X-ray regime. The overall spectral energy distribution (SED) of these broad line emitting AGN shows general trends seen in their mean SED (Richards et al 2006). It is the only quasar in the PG sample (Schmidt & Green 1983) that was not detected in a dedicated deep XMM-Newton pointing (Czerny et al 2008). It shows the most extreme optical to X-ray slope of all AGNs in the Brandt et al (2000) sample. The majority of broad absorption line quasars are X-ray weak. This is usually explained by the absorption of the outflowing wind in combination with the wind’s velocity shear. We wanted to test whether PG0043+039 shows additional special spectral properties
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
