The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 ≤ z ≤ 5.4
Abstract
We present the first results of our survey for high-redshift quasars at 5≲ z≲ 5.7. The search for quasars in this redshift range has been known to be challenging due to the limitations of the filter sets used in previous studies. We conducted a quasar survey for two specific redshift ranges, 4.60 ≤ z ≤ 5.40 and 5.50 ≤ z ≤ 6.05, using multi-wavelength data that include observations made with custom-designed filters, is and iz. Using these filters and a new selection technique, we were able to reduce the fraction of interlopers. Through optical spectroscopy, we confirmed six quasars at 4.7 ≤ z ≤ 5.4 with -27.4< {M}1450< -26.4 that recently were discovered independently by another group. We estimated black hole masses and Eddington ratios of four of these quasars from optical and near-infrared spectra, and found that these quasars are undergoing nearly Eddington-limited accretion that is consistent with the rapid growth of supermassive black holes in luminous quasars at z ∼ 5.
Based on observations made with ESO Telescopes at the La Silla Paranal Observatory, under programme 091.A-0878.- Publication:
-
The Astrophysical Journal Supplement Series
- Pub Date:
- August 2017
- DOI:
- 10.3847/1538-4365/aa7de5
- arXiv:
- arXiv:1706.08454
- Bibcode:
- 2017ApJS..231...16J
- Keywords:
-
- cosmology: observations;
- quasars: emission lines;
- quasars: general;
- quasars: supermassive black holes;
- surveys;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 16 pages, 12 figures, and 9 tables. Accepted for publication in ApJS