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  • Authors: Stephanie M. LaMassa, C. Megan Urry, Nico Cappelluti, Hans Böhringer, Andrea Comastri, Eilat Glikman, Gordon Richards, Tonima Ananna, Marcella Brusa, Carie Cardamone, Gayoung Chon, Francesca Civano, Duncan Farrah, Marat Gilfanov, Paul Green, S. Komossa, Paulina Lira, Martin Makler, Stefano Marchesi, Robert Pecoraro, Piero Ranalli, Mara Salvato, Kevin Schawinski, Daniel Stern, Ezequiel Treister, and Marco Viero

2016 The Astrophysical Journal 817 172.

  • Provider: AAS Journals

Caption: Figure 13.

Left: spectroscopic redshift distribution of the 1775 extragalactic Stripe 82X sources, with different classes of objects highlighted. Half the sample is above a redshift of one, and contains predominantly broad-line AGNs at these distances. Nearly all obscured AGNs (i.e., sources optically classified as galaxies with but with full band X-ray luminosities above 1042 erg s−1) are at a redshift below 1, while the optical and X-ray galaxies are at z < 0.25 (Compton-thick AGNs that have low observed X-ray flux due to heavy obscuration can be included in the “galaxy” bin). Right: observed full-band luminosity distribution for the 1603 spectroscopically confirmed X-ray AGNs (i.e., ﹩{L}_{0.5-10\mathrm{keV}}\gt {10}^{42}﹩ erg s−1), where the distribution peaks at high-luminosities (44.25 dex < Log(﹩{L}_{0.5-10\mathrm{keV}}﹩ erg s−1) < 45.25 dex). High-luminosity AGNs are predominantly broad-line sources while the lower-luminosity AGNs are mostly obscured. We note that these trends are for the ∼30% of the parent Stripe 82X sample that have spectroscopic redshifts and that with increased completeness and more sources identified via photometric redshifts, we expect to confirm more AGNs at all luminosities and redshifts, including at z > 2 and ﹩{L}_{0.5-10\mathrm{keV}}\gt {10}^{45}﹩ erg s−1, and a higher percentage of obscured AGN.

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