2026-04-14T03:35:28Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2182582025-12-05T16:10:03Zcom_2072_1057col_2072_478904col_2072_478917

Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XVII. Black Hole Mass Distribution at z 6 Estimated via Spectral Comparison with Low-z Quasars Takahashi, A. Matsuoka, Y. Onoue, M. Strauss, M. A. Kashikawa, N. Toba, Y. Iwasawa, Kazushi Imanishi, M. Akiyama, M. Kawaguchi, T. Noboriguchi, A. Lee, C.-H. Forats negres (Astronomia) Galàxies Quàsars Black holes (Astronomy) Galaxies Quasars We report the distribution of black hole (BH) masses and Eddingont ratios estimated for a sample of 131 low luminosity quasars in the early cosmic epoch (5.6 < z < 7.0). Our work is based on the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, which has constructed a low luminosity quasar sample down to M1450 ∼ − 21 mag, exploiting the survey data of Hyper Suprime-Cam installed on Subaru Telescope. The discovery spectra of these quasars are limited to the rest-frame wavelengths of ∼1200–1400 Å, which contain no emission lines that can be used as BH mass estimators. In order to overcome this problem, we made use of low-z counterpart spectra from the Sloan Digital Sky Survey, which are spectrally matched to the high-z spectra in overlapping wavelengths. We then combined the C iv emission line widths of the counterparts with the continuum luminosity from the SHELLQs data to estimate BH masses. The resulting BH mass distribution has a range of ∼107–10M⊙, with most of the quasars having BH masses ∼108M⊙ with sub-Eddington accretion. The present study provides not only a new insight into normal quasars in the reionization epoch, but also a new promising way to estimate BH masses of high-z quasars without near-infrared spectroscopy. 2025-01-30T17:14:27Z 2025-01-30T17:14:27Z 2024 2025-01-30T17:14:27Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.3847/1538-4357/ad045e Astrophysical Journal, 2024, vol. 960, num.112 https://doi.org/10.3847/1538-4357/ad045e (c) American Astronomical Society, 2024 info:eu-repo/semantics/openAccess Institute of Physics (IOP) Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))