The Active Galactic Nuclei in the Hobby-Eberly Telescope Dark Energy Experiment Survey (HETDEX) III. A red quasar with extremely high equivalent widths showing powerful outflows

TL;DR

This paper reports the discovery of a high equivalent width AGN at z~2.24 with powerful outflows, characterized by a double-peaked LyA emission line and significant spectral features, indicating an obscured active nucleus with strong winds.

Contribution

It presents the identification and detailed spectral analysis of a rare high EW AGN with extreme outflows, expanding understanding of AGN properties at high redshift.

Findings

Detected an AGN with EW(LyA+NV) > 921 Å at z~2.24.

Observed a double-peaked LyA emission profile with a 10.1 kpc separation.

Indicated the presence of powerful winds in an obscured AGN.

Abstract

We report an Active Galactic Nucleus (AGN) with extremely high equivalent width (EW), EW(LyA+NV,rest)>921 AA in the rest-frame, at z~2.24 in the Hobby-Eberly Telescope Dark Energy Experiment Survey (HETDEX) as a representative case of the high EW AGN population. The continuum level is a non-detection in the HETDEX spectrum, thus the measured EW is a lower limit. The source is detected with significant emission lines (>7sigma) at LyA+NV, CIV, and moderate emission line (~4sigma) at HeII within the wavelength coverage of HETDEX (3500 AA - 5500 AA). The r-band magnitude is 24.57 from the Hyper Suprime-Cam-HETDEX joint survey with a detection limit of r=25.12 at 5sigma. The LyA emission line spans a clearly resolved region of ~10 arcsec (85 kpc) in diameter. The LyA line profile is strongly double peaked. The spectral decomposed blue gas and red gas Ly$\alpha$ emission are separated by ~1.2 arcsec (10.1 kpc) with a line-of-sight velocity offset of ~1100 km/s. This source is probably an obscured AGN with powerful winds.