Broadband X-ray observations of four gamma-ray narrow-line Seyfert 1 galaxies

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Marco Berton
  • V. Braito
  • S. Mathur
  • L. Foschini
  • E. Piconcelli
  • S. Chen
  • R. W. Pogge

Research units

  • University of Turku
  • INAF—Osservatorio Astronomico di Brera
  • The Ohio State University
  • INAF, Osservatorio Astronomico di Roma
  • Istituto Nazionale di Fisica Nucleare

Abstract

Narrow-line Seyfert 1 galaxies (NLS1s) is one of the few classes of active galactic nuclei harboring powerful relativistic jets and detected in gamma-rays. NLS1s are well-known X-ray sources. While in non-jetted sources the origin of this X-ray emission may be a hot corona surrounding the accretion disk, in jetted objects, especially beamed ones, the contribution of corona and relativistic jet is difficult to disentangle without a proper sampling of the hard X-ray emission. For this reason, we observed with NuSTAR the first four NLS1s detected at high energy gamma-rays. These data, along with XMM-Newton and Swift/XRT observations, confirmed that X-rays originate both in the jet and in the accretion disk corona. Time variability in hard X-rays furthermore suggests that, as observed in flat-spectrum radio quasars, the dissipation region during flares could change its position from source to source, and it can be located both inside and outside the broad-line region. We find that jetted NLS1s, and other blazars as well, seem not to follow the classical fundamental plane of black hole (BH) activity, which therefore should be used as a BH mass estimator in blazars with extreme care only. Our results strengthen the idea according to which gamma-NLS1s are smaller and younger version of flat-spectrum radio quasars, in which both a Seyfert and a blazar component co-exist.

Details

Original languageEnglish
Article number120
Number of pages15
JournalAstronomy & Astrophysics
Volume632
Publication statusPublished - 16 Dec 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • galaxies, active, jets, quasars, supermassive black holes, X-rays, ACTIVE GALACTIC NUCLEI, SPECTRAL ENERGY-DISTRIBUTION, PHOTON IMAGING CAMERA, BLACK-HOLE MASSES, XMM-NEWTON VIEW, RADIO-LOUD, BEPPOSAX OBSERVATIONS, RELATIVISTIC JET, EMISSION REGION, PMN J0948+0022

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