Euclid
Euclid preparation. Observational expectations for redshift z<7 active galactic nuclei in the Euclid Wide and Deep surveys
Selwood et al., 2024 used our current best understanding of AGN to model the expected number of the population in the photometric Euclid surveys.
The figure shows with empty triangles the expected surface density of AGN detected in at least one of the Euclid bands. However, we do not know a priori their nature. If we apply a simple colour-colour selection criterion, we can retrieve immediately about 10% of the strongest QSO.
This simple selection will provide unparalleled numbers of many millions of AGN across the entire sky. Bridging the gap between the expected numbers and our current selection methods will keep us busy for the next years.
Euclid preparation XXXVIII. Spectroscopy of active galactic nuclei with NISP
Lusso et al., 2024 predicted the capability of the spectroscopic observations with Euclid. The AGN population typically shows emission lines that are broadened due to the fast rotation of gas clouds close to the black hole. As Euclid was designed to have low-resolution spectrographs, we created simulations to assess the possibility to model the broad emission lines, and thus measure the masses of black holes using Euclid spectra. The news are good! We will be able to have a good assessment of black holes masses directly from Euclid spectra, breaking all records from other surveys (see figure below).
Euclid. I. Overview of the Euclid mission
Mellier et al., 2024 presented an updated overview of the Euclid mission, launched on July 1st, 2023. Euclid will deliver an unprecedented survey of the extragalactic Universe. We will observe the majority of the extragalactic sky, at resolution comparable to the Hubble Space Telescope.
The mission will last nominally six years, with periodical public data releases of images and spectra. The figure shows that we expect to detect the largest number of redshifts among all existing an planned surveys to date.
[ESA page]