English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Radio and $\gamma$-ray loud narrow-line Seyfert 1 galaxies (NLS1s) are uniqueobjects to study the formation and evolution of relativistic jets, as they arebelieved to have high accretion rates and powered by low mass black holescontrary to that known for blazars. However, only about a dozen $\gamma$-raydetected NLS1s ($\gamma$-NLS1s) are known to date and all of them are at$z\le1$. Here, we report the identification of a new $\gamma$-ray emitting NLS1TXS 1206+549 at $z=1.344$. A near-infrared spectrum taken with the Subarutelescope showed H$\beta$ emission line with FWHM of $1194\pm77$ km s$^{-1}$and weak [O III] emission line but no optical Fe II lines, due to the limitedwavelength coverage and poor signal-to-noise ratio. However, UV Fe II lines arepresent in the SDSS optical spectrum. The source is very radio-loud,unresolved, and has a flat radio spectrum. The broadband SED of the source hasthe typical two hump structure shown by blazars and other $\gamma$-NLS1s. Thesource exhibits strong variability at all wavelengths such as the optical,infrared, and $\gamma$-ray bands. All these observed characteristics show thatTXS 1206+549 is the most distant $\gamma$-NLS1 known to date.

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