9 papers
Euclid: Discovery of 31 new quasars at
D. Yang, J. F. Hennawi, F. Guarneri +211
We report the discovery of 31 new high- quasars in the redshift range . These quasars were selected from approximately 3000 deg of sky covered during the firs…
The host halo masses of AGNs and quasars at with TNG-Cluster, FLAMINGO and other cosmological galaxy simulations
Akanksha Kapahtia, Annalisa Pillepich, Joey Braspenning +5
Most observations and clustering analyses suggest that quasars inhabit a narrow range of dark-matter halo masses ( M) across cosmic time (). Recen…
The Radio--X-ray Correlation of High-Redshift AGN: A Numerical Study of Inverse-Compton Scattering of the CMB Photons in Relativistic Jets
Aditya Sharma, Bhargav Vaidya, Silvia Belladitta +5
Relativistic jets from active galactic nuclei are expected to exhibit strong redshift evolution in their radiative output due to the increasing energy density of the cosmic microwa…
Persephone's Torch: A 15th Magnitude Quadruply-Lensed Quasar From the Couch Discovered with SPHEREx and the LBT
Frederick B. Davies, Eduardo Bañados, Sarah E. I. Bosman +4
Here we report the spectroscopic and geometric confirmation of an extremely bright () and compact (Einstein radius of ) quadruply-lensed quasar at , J1…
Observations of Early Black Holes Before and After JWST
Eduardo Banados
These notes are from three lectures given at the 54th Saas-Fee Advanced Course of the Swiss Society of Astrophysics and Astronomy in January 2025. This chapter reviews the dramatic…
Three Hundred Quasars from the Couch: A first look at high-redshift quasar discovery with SPHEREx
Frederick B. Davies, Sarah E. I. Bosman, Arpita Ganguly +9
Photometric selection of luminous high-redshift () quasars is plagued by contamination from numerous low-mass Galactic stars, reddened lower-redshift quasars, as well as…