SIMBAD references

2006ApJ...639..710K - Astrophys. J., 639, 710-715 (2006/March-2)

The radio-loud narrow-line quasar SDSS J172206.03+565451.6.

KOMOSSA S., VOGES W., ADORF H.-M., XU D., MATHUR S. and ANDERSON S.F.

Abstract (from CDS):

We report identification of the radio-loud narrow-line quasar SDSS J172206.03+565451.6, which we found in the course of a search for radio-loud narrow-line active galactic nuclei (AGNs). SDSS J172206.03+565451.6 is only about the fourth securely identified radio-loud narrow-line quasar and the second-most radio loud, with a radio index R1.4~100-700. Its black hole mass, MBH≃(2-3)x107 Mestimated from Hβ line width and 5100 Å luminosity, is unusually small given its radio loudness, and the combination of mass and radio index puts SDSS J172206.03+565451.6 in a scarcely populated region of MBH-R diagrams. SDSS J172206.03+565451.6 is a classical narrow-line Seyfert 1-type object with FWHM≃1490 km/s, an intensity ratio of [O III]/Hβ≃0.7, and Fe II emission complexes with Fe II λ4570/Hβ≃0.7. The ionization parameter of its narrow-line region, estimated from the line ratio [O II]/[O III], is similar to Seyferts, and its high ratio of [Ne V]/[Ne III] indicates a strong EUV-to-soft X-ray excess. We advertise the combined usage of [O II]/[O III] and [Ne V]/[Ne III] diagrams as a useful diagnostic tool to estimate ionization parameters and to constrain the EUV-soft X-ray continuum shape relatively independently from other parameters.

Abstract Copyright:

Journal keyword(s): Galaxies: Quasars: Emission Lines - Galaxies: Quasars: General - quasars: individual (SDSS J172206.03+565451.6) - Radio Continuum: Galaxies - X-Rays: Galaxies

Simbad objects: 7

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2019.10.19-15:39:48

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