TXS 1206+549: a new $\gamma$-ray detected narrow-line Seyfert 1 galaxy at redshift 1.34?

Abstract

Radio and $\gamma$-ray loud narrow-line Seyfert 1 galaxies (NLS1s) are unique objects to study the formation and evolution of relativistic jets, as they are believed to have high accretion rates and powered by low mass black holes contrary to that known for blazars. However, only about a dozen $\gamma$-ray detected NLS1s ($\gamma$-NLS1s) are known to date and all of them are at $z\le 1$. Here, we report the identification of a new $\gamma$-ray emitting NLS1 TXS 1206+549 at $z=1.344$. A near-infrared spectrum taken with the Subaru telescope showed H$\beta$ emission line with FWHM of $1194\pm 77$ km s${}^{-1}$ and weak [O III] emission line but no optical Fe II lines, due to the limited wavelength coverage and poor signal-to-noise ratio. However, UV Fe II lines are present in the SDSS optical spectrum. The source is very radio-loud, unresolved, and has a flat radio spectrum. The broadband SED of the source has the typical two hump structure shown by blazars and other $\gamma$-NLS1s. The source exhibits strong variability at all wavelengths such as the optical, infrared, and $\gamma$-ray bands. All these observed characteristics show that TXS 1206+549 is the most distant $\gamma$-NLS1 known to date.

arXiv commentAccepted in MNRAS Letter

References in corpus (46)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Swift X-ray Telescope
• Determining Central Black Hole Masses in Distant Active Galaxies and Quasars. II. Improved Optical and UV Scaling Relationships
• First Results from the Catalina Real-time Transient Survey
• Spectral Energy Distributions and Multiwavelength Selection of Type 1 Quasars
• Initial Performance of the NEOWISE Reactivation Mission
• Optical and Radio Properties of Extragalactic Sources Observed by the FIRST and SDSS Surveys
• Canonical high power blazars
• The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
• A Comprehensive Study of 2 000 Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey: I. The Sample
• Radio-loud Narrow-Line Type 1 Quasars
• Radio-Loud Narrow-Line Seyfert 1 as a New Class of Gamma-Ray AGN
• On Black Hole Masses and Radio Loudness in AGN
• A Population of Radio-loud Narrow Line Seyfert 1 Galaxies with Blazar-like Properties?
• Slim Disk Model for Soft X-Ray Excess and Variability of Narrow-Line Seyfert 1 Galaxies
• A spectrophotometric atlas of Narrow-Line Seyfert 1 galaxies
• Jets and accretion processes in Active Galactic Nuclei: further clues
• Fe II Emission in 14 Low-Redshift Quasars: I - Observations
• Estimating Black Hole Masses in Active Galactic Nuclei Using the MgII 2800 Emission Line
• Spectral properties of quasars from Sloan Digital Sky Survey data release 14: The catalog
• The VLBA Imaging and Polarimetry Survey at 5 GHz
• Gamma-Ray Studies of Blazars: Synchro-Compton Analysis of Flat Spectrum Radio Quasars
• A Unified Catalog of Radio Objects Detected by NVSS, FIRST, WENSS, GB6, and SDSS
• A Catalog of Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey Data Release 12
• Constraining the limiting brightness temperature and Doppler factors for the largest sample of radio bright blazars
• A narrow line Seyfert 1--blazar composite nucleus in 2MASX J0324+3410
• Are the black hole masses in Narrow Line Seyfert 1 galaxies actually small?
• A radio spectral index map and catalogue at 147-1400 MHz covering 80 per cent of the sky
• Narrow-line Seyfert 1 Galaxies from the Sloan Digital Sky Survey Early Data Release
• General Physical Properties of CGRaBS Blazars
• A Very Radio-Loud Narrow-Line Seyfert 1: PKS 2004-447
• Rapid Infrared Variability of Three Radio-loud Narrow-line Seyfert 1 Galaxies: A View from the Wide-field Infrared Survey Explorer
• Optical Variability of Narrow and Broad line Seyfert 1 galaxies
• Gamma-ray Emitting Narrow Line Seyfert 1 Galaxies in The Sloan Digital Sky Survey
• Identification of a New $\gamma$-ray-emitting narrow-line Seyfert 1 Galaxy, at Redshift $\sim 1$
• The disc-like host galaxies of radio-loud Narrow-Line Seyfert 1s
• General Physical Properties of Gamma-ray Emitting Narrow-Line Seyfert 1 Galaxies
• Contemporaneous VLBA 5 GHz Observations of LAT-Detected Blazars
• Probing narrow-line Seyfert 1 galaxies in the southern hemisphere
• The physical properties of $Fermi$-4LAC flat spectrum radio quasars
• The FeII/MgII flux ratio of low-luminosity quasars at z~3
• Broad line region and black hole mass of PKS 1510-089 from spectroscopic reverberation mapping
• WISE view of Narrow-Line Seyfert 1 galaxies: mid-infrared color and variability
• SDSS J094635.06+101706.1: a redshift one, very radio-loud, γ-ray emitting narrow-line Seyfert 1 galaxy
• A comparison of X-ray photon indices among the narrow and broad-line Seyfert 1 galaxies
• Blazars in the LOFAR Two-Metre Sky Survey First Data Release

Cited by in corpus (8)

• Radio spectra of narrow-line Seyfert 1 galaxies observed with ATCA and VLASS
• Multiwavelength variability of gamma-ray emitting narrow-line Seyfert 1 galaxies
• A γ-ray emitting NLS1 galaxy SDSS J095909.51+460014.3 identified by multiwavelength contemporaneous brightening
• Superluminal Motion and Jet Parameters in the Gamma-ray-Emitting Narrow-Line Seyfert 1 Galaxy TXS 1206+549
• Intra-night optical variability and radio characteristics of extremely radio-loud narrow-line Seyfert 1 galaxies
• Hunting for the nature of the enigmatic narrow-line Seyfert 1 galaxy PKS 2004-447
• Unravelling the origin of extended radio emission in narrow-line Seyfert 1 galaxies with the JVLA
• Modeling Cosmological Evolution of Jetted Seyfert Galaxies for z<10