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

The AGN-host co-evolution issue is investigated here by focusing on theevolution of the [\ion{O}{3}]$\lambda5007$ emission-line profile. In order tosimultaneously measure both [\ion{O}{3}] line profile and circumnuclear stellarpopulation in individual spectrum, a large sample of narrow emission-linegalaxies is selected from the MPA/JHU SDSS DR7 catalog. By requiring that 1)the [\ion{O}{3}] line signal-to-noise ratio is larger than 30, 2) the[\ion{O}{3}] line width is larger than the instrumental resolution by a factorof 2, our sample finally contains 2,333 Seyfert galaxies/LINERs (AGNs), 793transition galaxies, and 190 starforming galaxies. In additional to thecommonly used profile parameters (i.e., line centroid, relative velocity shiftand velocity dispersion), two dimensionless shape parameters, skewness andkurtosis, are used to quantify the line shape deviation from a pure Gaussianfunction. We show that the transition galaxies are systematically associatedwith narrower line widths and weaker [\ion{O}{3}] broad wings than the AGNs,which implies that the kinematics of the emission-line gas is different in thetwo kinds of objects. By combining the measured host properties and line shapeparameters, we find that the AGNs with stronger blue asymmetries tend to beassociated with younger stellar populations. However, the similar trend is notidentified in the transition galaxies. The failure is likely resulted from aselection effect in which the transition galaxies are systematically associatedwith younger stellar populations than the AGNs. The evolutionary significancerevealed here suggests that both NLR kinematics and outflow feedback in AGNsco-evolve with their host galaxies.

Evolution of [OIII]5007 emission-line profiles in narrow emission-line galaxies