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

Masers are a unique tool to investigate the emitting gas in the innermostregions of AGNs and to map accretion disks and tori orbiting aroundsupermassive black holes. IC485, which is classified as a LINER or Seyfertgalaxy, hosts a bright water maser whose nature is still under debate. Indeed,this might be either a nuclear disk maser, a jet/outflow maser, or even thevery first `inclined water maser disk'. We aim to investigate the nature of themaser by determining the location and the distribution of the maser emission atmas resolution and by associating it with the main nuclear components of IC485.In a broader context, this work might also provide further information forbetter understanding the physics and the disk/jet geometry in LINER or Seyfertgalaxies. We observed in 2018 the nuclear region of IC485 in continuum andspectral-line mode with the VLBA and the EVN at L, C, and K bands (linearscales from ~3 to 0.2 pc). We detected 2 water maser components separated invelocity by 472 km/s, with one centred at the systemic velocity of the nuclearregion and the other at a red-shifted velocity. We measured for the first timethe absolute positions of these components with an accuracy of ~0.1 mas.Assuming a maser associated with an edge-on disk in Keplerian rotation, theestimated enclosed mass is M_BH = 1.2 x 10^7 M_sun, consistent with theexpected mass for a SMBH in a LINER or Seyfert galaxy. The linear distributionof the maser components and a comparison with the high sensitivity GBT spectrumstrongly suggest that the bulk of the maser emission is associated with anedge-on accretion disk. This makes IC485 a new candidate for a disk-masergalaxy at the distance of 122 Mpc. In particular, thanks to the upcoming radiofacilities (e.g., the SKA and the ngVLA) IC485 will play an important role inour understanding of AGNs in an unexplored volume of Universe.

IC 485:a new candidate disk-maser galaxy at $\sim$100 Mpc distance.  Milliarcsecond resolution study of the galaxy nucleus and of the $H_{2}O$  megamaser