2024年7月11日 · JWST has discovered a large population of Active Galactic Nuclei (AGN) at high redshift. Many of these newly discovered AGN have broad permitted lines (typically H$\alpha$), but are extremely weak in the X-rays.

2023年3月21日 · Mid-infrared observations are powerful in identifying heavily obscured Active Galactic Nuclei (AGN) which have weak emission in other wavelengths. Data from the Mid-Infrared Instrument (MIRI) onboard JWST provides an …

2023年10月27日 · Galaxies with strong Na I D absorption are distinguished by enhanced emission line ratios consistent with AGN ionization. We conservatively measure mass outflow rates of 3 - 100 M_\odot yr ^ {-1}; comparable to or exceeding ionized gas outflow rates measured for galaxies at similar stellar mass and redshift.

2024年5月16日 · After one year of operations, one of the most surprising findings in the field of extragalactic astronomy produced by the JWST (Gardner et al. 2023; Rigby et al. 2023) is the unexpectedly high abundance of active galactic nuclei (AGN) during the first billion years of cosmic history (z ≳ 5.5; Greene et al. 2023; Harikane et al. 2023; Kocevski ...

2025年1月28日 · In this paper, we provide a theoretical perspective on the abundance of AGN candidates unveiled with JWST by comparing their number to predictions from large-scale cosmological simulations. We describe the simulations in Section 2.

2024年10月16日 · JWST has discovered a large population of active galactic nuclei (AGN) at high redshift, which are weak in the X-rays.

At the time of writing, about 50 active galactic nucleus (AGN) detections and candidates have been identified through spectroscopy, photometry, and/or morphology. Broad-line AGN are about a hundred times more numerous than the faint end of the UV-bright quasar population at …

JWST has discovered a large population of active galactic nuclei (AGN) at high redshift, which are weak in the X-rays. Here we present the NIRSpec spectrum of the most extreme of these objects, GN-28074, an AGN at $z=2.26$ with prominent hydrogen and He I broad lines, and with the highest limit on the bolometric to X-ray luminosity ratio among ...

2025年3月17日 · Specifically, we measured the fluxes in the HST and JWST filters from within 0.3 arcsec of the galaxy centre, where most of the AGN emission was expected according to the PSFs.

1 天前 · Abstract. JWST has uncovered large numbers of compact galaxies at high redshift with broad hydrogen/helium lines. These include the enigmatic population known as “little red dots” (LRDs)[1, 2].Their nature is debated, but they are thought to be powered by supermassive black holes (SMBHs)[3, 4] or intense star formation[].They exhibit unusual properties for SMBHs, such as black holes that ...