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The Active Galactic Nuclei in the Hobby–Eberly Telescope Dark Energy Experiment Survey (HETDEX). I. Sample Selection

  • Authors: Chenxu Liu, Karl Gebhardt, Erin Mentuch Cooper, Dustin Davis, Donald P. Schneider, Robin Ciardullo, Daniel J. Farrow, Steven L. Finkelstein, Caryl Gronwall, Yuchen Guo, Gary J. Hill, Lindsay House, Donghui Jeong, Shardha Jogee, Wolfram Kollatschny, Mirko Krumpe, Martin Landriau, Oscar A Chavez Ortiz, Yechi Zhang

Chenxu Liu et al 2022 The Astrophysical Journal Supplement Series 261 .

  • Provider: AAS Journals

Caption: Figure 2.

Example AGN at different redshifts selected by the 2em search. Left: r-band images collected from various surveys. More information of the r-band imaging surveys searched can be found in Appendix B. The blue crosses show the positions of all detections in the raw emission-line and continuum catalogs within the field. The orange cross shows the emission-line flux-weighted friend-of-friend (fof) center of these detections (see Section 4.5 for more details), while the red cross indicates the position of the best detection (detectidbest), i.e., the detection closest to the emission-line flux-weighted fof center among all member detections. The red dashed circle shows the aperture of the PSF-extracted spectra of detectidbest. The PSF extraction collects all fibers within a 3.″5 radius aperture and then applies flux weights to each fiber spectrum that consider both the PSF and the differential atmospheric refraction (DAR) of light across the aperture. Right: The spectrum of the detectidbest of each AGN extracted with the aperture shown by the red circle in the left panels. The black data points with error bars are the observed spectra. The red curve shows our best-fit spectrum. The cyan dashed line is our best-fit model to the continuum with the green shaded windows. The best-fit redshift of each AGN is labeled in the upper right corner.

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