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Predicting the Yields of $z$ > 6.5 Quasar Surveys in the Era of Roman and Rubin by Tee, Wei Leong; Fan, Xiaohui; Wang, Feige; Yang, Jinyi; Malhotra, Sangeeta; Rhoads, James E. is a scholarly article available to read on EtoBox.

What is Predicting the Yields of $z$ > 6.5 Quasar Surveys in the Era of Roman and Rubin about?

Around 70 $z>6.5$ luminous quasars have been discovered, strongly biased toward the bright end, thus not providing a comprehensive view on quasar abundance beyond cosmic dawn. We present the predicted results of Roman/Rubin high-redshift quasar survey, yielding 3 times more, $2-4$ magnitudes deeper quasar samples, probing high-redshift quasars across broad range of luminosities, especially faint quasars at $L_\mathrm{bol}\sim 10^{10}\;L_{\odot}$ or $M_\mathrm{1450} \sim-22$ that are currently poorly explored. We include high-$z$ quasars, galactic dwarfs and low-$z$ compact galaxies with similar colors as quasar candidates. We create mock catalogs based on population models to evaluate selection completeness and efficiency. We utilize classical color dropout method in $z$ and $Y$ bands to select primary quasar candidates, followed up with Bayesian selection method to identify quasars. We show that overall selection completeness $> 80\%$ and efficiency $\sim 10\%$ at $6.5<z<9$, with 180 quasars at $z>6.5$, 20 at $z > 7.5$ and 2 at $z > 8.5$. The quasar yields depend sensitively on the assumed quasar luminosity shape and redshift evolution. Brown dwarf rejection through proper motion

Author

Tee, Wei Leong; Fan, Xiaohui; Wang, Feige; Yang, Jinyi; Malhotra, Sangeeta; Rhoads, James E.

Published

2023

Language

EN