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Insights Into Physical Conditions and Magnetic Fields from High Redshift Quasars by Lee, Bomee; Chary, Ranga-Ram is a scholarly article available to read on EtoBox.

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We use archival WISE and Spitzer photometry to derive optical line fluxes for a sample of distant quasars at z ~6. We find evidence for exceptionally high equivalent width [OIII] emission (rest-frame EW ~400 {\AA}) similar to that inferred for star-forming galaxies at similar redshifts. The median Halpha and Hbeta equivalent widths are derived to be ~400{\AA} and 100~{\AA}, respectively, and are consistent with values seen among quasars in the local Universe, and at z ~2. After accounting for the contribution of photoionization in the broad line regions of quasars, we suggest that the OIII emission corresponds to strong, narrow line emission likely arising from feedback due to massive star-formation in the quasar host. The high [OIII]/Hbeta line ratios can uniquely be interpreted with radiative shock models, and translate to magnetic field strengths of ~8 microGauss with shock velocities of ~400km/s. Our measurement implies that strong, coherent magnetic fields were present in the interstellar medium at a time when the universe was < 1 billion years old. Comparing our estimated magnetic field strengths with models for the evolution of galaxy-scale fields, favors high seed field str

Author

Lee, Bomee; Chary, Ranga-Ram

Published

2022

Language

EN