Viewing angle observations and effects of evolution with redshift, black hole mass, and Eddington ratio in quasar based cosmology

Understand

This study is focused on the observational measurement of the viewing angle of individual quasars by modeling the broadband quasar spectrum ranging from the infra-red (IR) to the soft X-ray band.

• Sources are selected from various published catalogs, and their broadband quasi-simultaneous spectral data points were collected and used to model.
• We started with a COSMOS sample of type-1 sources which have broadband photometric points.
• Then, to include more data points, we cross-matched the COSMOS with the SDSS DR14 quasar catalog, and eventually, we find 90 sources that have broadband data ranging from IR to soft X-ray.