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

HE 0435-5304 from Hamburg European Southern Observatory survey is a quasarthat appears in the literature with two conflicting redshift values: $\sim 1.2$and $\sim 0.4$. It was used in the studies of the intergalactic medium throughfitting of the narrow absorption lines in its ultraviolet (UV) spectrum. Thissource is also known historically as a luminous infrared galaxy. We presentoptical spectra of HE 0435-5304, aiming to precisely measure its redshift andto study its physical properties. In particular, properties of its activenucleus, which is studied in the context of the source being identified here asan ultra-luminous infrared galaxy, allow us to place this quasar in the contextof the general population. Fitting the spectra, we focused on modeling H$\beta$and [O III] lines. Based on these, we derived the virial black hole mass,bolometric luminosity, and Eddington ratio of the active galactic nucleus(AGN). Additionally, we performed broad band photometry fitting which allows usto quantify host galaxy parameters. The improved redshift value of HE 0435-5304is estimated to $0.42788 \pm 0.00027$ based on the [O II] line, which is mostlyconsistent with the narrowest components of the other emission lines. Thesource was found to be a relatively massive and luminous AGN whose host galaxyis actively forming stars. Although its stellar population seems to be heavilyobscured, we did not find evidence for significant obscuration of the nucleus.We conclude that the AGN HE 0435-5304 is a rather prominent iron emitter fromthe extreme type-A population very close to the narrow-line Seyfert 1 group.The fact that the width of the H$\beta$ line appears to be systematicallygrowing in its broadest component with time may suggest that this AGN ischanging its broad line region. Due to the influence of atmospheric effects,this finding is uncertain.

AGN in the ULIRG HE 0435-5304