The Radio‐Loud Narrow‐Line Quasar SDSS J172206.03+565451.6

2005/11/16 by S. Komossa, W. Voges, H. M. Adorf +7 · 25 citations
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Cosmic Phenomena #Galaxies: Formation, Evolution, Phenomena #Galaxy #Hydrogen line #Line (geometry) #OVV quasar #Physics #Quasar #Spectral line #astro-ph

paper · pdf · doi:10.1086/499764

published in The Astrophysical Journal 639(2), 710-715 (IOP Publishing) · 17 pages, 4 figures; ApJ, in press

arxiv created 2005/11/16 · openalex publication_date 2006/03/06 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

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 (AGN). SDSSJ172206.03+565451.6 is only the ~4th securely identified radio loud narrow-line quasar and the second-most radio loudest with a radio index R₁.4 ~ 100-700. Its black hole mass, M_BH = (2-3) 10⁷ M_sun, is unusually small given its radio loudness, and the combination of mass and radio index puts SDSSJ172206.03+565451.6 in a scarcely populated region of M_BH-R diagrams. SDSSJ172206.03+565451.6 is a classical Narrow-Line Seyfert1-type object with FWHM_Hbeta = 1490 km/s, an intensity ratio of [OIII]/Hbeta = 0.7 and FeII emission complexes with FeII4570/Hbeta = 0.7. The ionization parameter of its narrow-line region, estimated from the line ratio [OII]/[OIII], is similar to Seyferts and its high ratio of [NeV]/[NeIII] indicates a strong EUV to soft-X-ray excess. We advertise the combined usage of [OII]/[OIII] and [NeV]/[NeIII] diagrams as a useful diagnostic tool to estimate ionization parameters and to constrain the EUV continuum shape relatively independent from other parameters.

Citations

• The NRAO VLA Sky Survey
• A Very Radio Loud Narrow‐Line Seyfert 1: PKS 2004−447
• Exploring Narrow-Line Seyfert 1 Galaxies through the Physical Properties of Their Hosts
• M BH - Relation for a Complete Sample of Soft X-Ray-selected Active Galactic Nuclei
• Narrow-line Seyfert 1 Galaxies from the Sloan Digital Sky Survey Early Data Release
• CLOUDY 90: Numerical Simulation of Plasmas and Their Spectra
• An Active Galactic Nucleus Sample with High X‐Ray–to–Optical Flux Ratio from RASS. II. Optical Emission Line Properties of Seyfert 1–Type Active Galactic Nuclei
• Extreme slim accretion disks and narrow line Seyfert 1 galaxies: The nature of the soft X-ray hump
• The black hole--bulge relation in active galactic nuclei
• Evolution of active galaxies: black-hole mass–bulge relations for narrow line objects
• The relationship between radio luminosity and black hole mass in optically selected quasars
• The USNO-B Catalog
• A Large, Uniform Sample of X-Ray-emitting AGNs: Selection Approach and an Initial Catalog from theROSATAll-Sky and Sloan Digital Sky Surveys

Cited by

• A Large, Uniform Sample of X-Ray-emitting Active Galactic Nuclei from the ROSAT All Sky and Sloan Digital Sky Surveys: The Data Release 5 Sample