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

We analyze the kinematics of the central regions of five isolated Seyfertspiral galaxies from the DEGAS sample (four with new data presented in thispaper, IC184, UGC3223, NGC2639, NGC6814, and NGC6951 from our previous data),by using long slit spectroscopy in the CaII triplet range (at ~ 8600 A)obtained with a 4m-class telescope. A drop of the velocity dispersions in theinnermost 1-3 arcsec is observed in four of them, and hinted in the remaininggalaxy (NGC6814). The available HST images for our sample together with anothernine galaxies with reported velocity dispersion drops, are also used toinvestigate the presence of morphological inner structures at the scales of thekinematical drops. Evidence for disk-like shapes is found in 12 out of the 14cases. The only exceptions are NGC6814 and NGC6951. Existing N-body simulationsincluding stars, gas and star formation predict that such a drop is mostprobably due to a young stellar population born from dynamically cold gasaccreted in a circumnuclear disk formed during an episode of central gasaccretion driven by a bar. The equivalent widths of the Calcium triplet linesfor our 5 galaxies have been measured. Even if the profiles could be formallyconsistent with constant EW(CaT) values, they seem to indicate the presence ofa local maximum in the regions corresponding spatially to the drops; ifconfirmed, this would imply the presence of a different stellar population,whose properties could help constraining the models.Comment: A&A accepted for publicatio

The detection of stellar velocity dispersion drops in the central regions of five isolated Seyfert spirals