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

In order to study the state of gas in galaxies, diagrams of the relation ofoptical emission line fluxes are used allowing one to separate main ionizationsources: young stars in the H II regions, active galactic nuclei, and shockwaves. In the intermediate cases, when the contributions of radiation from OBstars and from shock waves mix, identification becomes uncertain, and the issueremains unresolved on what determines the observed state of the diffuse ionizedgas (DIG) including the one on large distances from the galactic plane. Addingof an extra parameter - the gas line-of-sight velocity dispersion - toclassical diagnostic diagrams helps to find a solution. In the present paper,we analyze the observed data for several nearby galaxies: for UGC 10043 withthe galactic wind, for the star forming dwarf galaxies VII Zw 403 and Mrk 35,for the galaxy Arp 212 with a polar ring. The data on the velocity dispersionare obtained at the 6-m SAO RAS telescope with the Fabry-Perot scanninginterferometer, the information on the relation of main emission-line fluxes -from the published results of the integral-field spectroscopy (the CALIFAsurvey and the MPFS spectrograph). A positive correlation between the radialvelocity dispersion and the contribution of shock excitation to gas ionizationare observed. In particular, in studying Arp 212, "BPT-sigma relation" allowedus to confirm the assumption on a direct collision of gaseous clouds on theinclined orbits with the main disk of the galaxy.

Diagnostics of ionized gas in galaxies with the "BPT--radial velocity dispersion" relation