Physical Properties of 15 Quasars at z ≳ 6.5
- Mazzucchelli, C.
- Bañados, E.
- Venemans, B. P.
- Decarli, R.
- Farina, E. P.
- Walter, F.
- Eilers, A.-C.
- Rix, H.-W.
- Fan, X.
- Rosa, G. De
- Hennawi, J.
- Chambers, K. C.
- Burgett, W.
- Draper, P. W.
- Kaiser, N.
- Kudritzki, R.-P.
- Metcalfe, N.
- Wainscoat, R. J.
- Simcoe, Robert A
- Sternberg, David C.
- Schlafly, Eddie Ford
- Greiner, Julia
- Magnier, Eugene A.
- Waters, Christopher Lee
DOIAbstract
Quasars are galaxies hosting accreting supermassive black holes; due to their brightness, they are unique probes of the early universe. To date, only a few quasars have been reported at z > 6.5 (<800Myr after the big bang). In this work, we present six additional z ≳ 6.5 quasars discovered using the Pan-STARRS1 survey. We use a sample of 15 z ≳ 6.5 quasars to perform a homogeneous and comprehensive analysis of this highest-redshift quasar population. We report four main results: (1) the majority of z ≳ 6.5 quasars show large blueshifts of the broad CIVλ1549 emission line compared to the systemic redshift of the quasars, with a median value ∼3× higher than a quasar sample at z ∼ 1; (2) we estimate the quasars black hole masses (MBH∼(0.3-5) ×...
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