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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

[Abridged] Narrow-line Seyfert 1 (NLS1) galaxies are a class of activegalactic nuclei (AGN) that have all the properties of type 1 Seyfert galaxiesbut show peculiar characteristics, including the narrowest Balmer lines,strongest Fe II emission, and extreme properties in the X-rays. Line andcontinuum radio observations provide an optimal tool to access the (often)optically obscured innermost regions of AGN and reveal the kinematics of thegas around their central engines. We investigate the interplay between thepeculiar NLS1 class of AGN and the maser phenomenon, to help us understand thenature of the maser emission in some NLS1s where water maser emission has beendetected. We observed a sample of NLS1 galaxies with the Green Bank Telescopein a search for water maser emission at 22 GHz. We also reduced and analysedarchival Green Bank Telescope and Very Large Array data and produced 22-GHzspectra for the five NLS1 galaxies with detected maser emission. In particular,we imaged the maser and nuclear radio continuum of NGC5506 at subarcsec scaleswith the Very Large Array. We discovered maser emission in two NLS1 galaxies:IGRJ16385-2057, and IRAS03450+0055. In addition to the three previously knownmaser detections in the NLS1s Mrk766, NGC4051, and NGC5506, this yields a watermaser detection rate in NLS1 galaxies of ~7% (5/71). This value risessignificantly to ~21% (5/24) when considering only NLS1 galaxies at recessionalvelocities less than 10000 km/s. For NGC4051 and NGC5506, we find that thewater maser emission is located within 5 and 12 pc, respectively, of nuclearradio continuum knots, which are interpreted as core-jet structures.

Narrow-line Seyfert 1 galaxies: an amasing class of AGN