Colloquium on May. 9, 2022

The Active Galactic Nuclei in the Hobby-Eberly Telescope Dark Energy Experiment Survey (HETDEX)

Speaker: Chenxu Liu (University of Texas at Austin)

Venue: SWIFAR Building, Room 2111

Time: 15:00 PM, Thursday, May. 9, 2022

Abstract:

Hobby-Eberly Telescope Dark Energy Experiment Survey (HETDEX)  is an ongoing spectroscopic survey (3500 AA - 5500 AA) with no target pre-selection based on magnitudes, colors or morphologies, enabling us to select AGN based solely on their spectral features. I will present our first Active Galactic Nuclei (AGN) catalog of HETDEX observed between January 2017 and June 2020. Both luminous quasars and low-luminosity Seyferts are found in our catalog. AGN candidates are selected with at least two significant AGN emission lines, such as the LyA and CIV line pair, or with a single broad emission line with FWHM>1000 km/s. Each source is further confirmed by visual inspections. This catalog contains 5,322 AGN, covering an effective sky coverage of 30.61 deg2. A total of 3,733 of these AGN have secure redshifts, and we provide redshift estimates for the remaining 1,589 single broad-line AGN with no cross matched spectral redshifts from SDSS DR14Q. The redshift range of the AGN catalog is 0.25<z<4.32, with a median of z=2.1, the bolometric luminosity range is 10^9-10^14 Lsun with a median of 10^12 Lsun. The median r-band magnitude of our AGN catalog is 21.6 mag, with 34% having r>22.5, and 2.6% reaching the detection limit at r~26 mag of the deepest imaging surveys we searched. We also provide a composite spectrum of the AGN sample covering 700 AA - 4400 AA. I will also introduce the luminosity function of our HETDEX AGN and some interesting individual cases found in our catalog.

Report PPT:  SWIFAR_Chenxu Liu.pdf