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 this third paper in a series on the nature of extended, asymmetric Lymanalpha emitters at z ~ 3 we report the discovery, in an ultra-deep, blind,spectroscopic long-slit survey, of a Lyman alpha emitting halo around a QSO atredshift 3.045. The QSO is a previously known, obscured AGN. The halo appearsextended along the direction of the slit and exhibits two faint patchesseparated by 17 proper kpc in projection from the QSO. Comparison of the2-dimensional spectrum with archival HST ACS images shows that these patchescoincide spatially with emission from a peculiar, dumbbell-shaped, faintgalaxy. The assumptions that the Lyman alpha emission patches are originatingin the galaxy and that the galaxy is physically related to the QSO are atvariance with photometric estimates of the galaxy redshift. We show, however,that a population of very young stars at the redshift of the QSO may fit theexisting rest frame broad band UV photometry of the galaxy. If this scenario iscorrect then the symmetry of the galaxy in continuum and Lyman alpha emission,the extension of the QSO's Lyman alpha emission in its direction, and thelikely presence of a young stellar population in close proximity to a(short-lived) AGN suggest that this may be an example of AGN feedbacktriggering external star formation in high redshift galaxies.

A z=3.045 Lyman alpha emitting halo hosting a QSO and a possible candidate for AGN-triggered star-formation