2015A&A...577L...1K -
Astronomy and Astrophysics, volume 577, L1-1 (2015/5-1)
Proving strong magnetic fields near to the central black hole in the quasar PG 0043+039 via cyclotron lines.
KOLLATSCHNY W., SCHARTEL N., ZETZL M., SANTOS-LLEO M., RODRIGUEZ-PASCUAL P.M. and BALLO L.
Abstract (from CDS):
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 αox 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 αox=-2.37±0.05 gradient is consistent with an unusual steep gradient Fν~να with α=-2.67±0.02 seen in the UV/far-UV continuum. The optical/UV continuum flux has a clear maximum near 2500Å. 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∼3keV and magnetic field strengths of B ∼2x108G for the line-emitting regions close to the black hole.
Abstract Copyright:
∼
Journal keyword(s):
galaxies: active - quasars: emission lines - galaxies: individual: PG0043+039
Simbad objects:
4
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2015A&A...577L...1K and select 'bookmark this link' or equivalent in the popup menu