AGN obscuration, Eddington ratio distribution and clustering: deep and wide X-ray surveys with NuSTAR and Chandra in the UKIDSS-UDS and Bootes fields
Abstract
X-ray surveys are one of the most efficient ways to detect active galactic nuclei (AGN) and perform statistically meaningful population studies. In the past decade, important results in this field came from both wide and deep X-ray surveys of the sky performed by the Chandra and XMM-Newton observatories. The launch of NuSTAR in 2012 allowed to extend such sensitive surveys to higher energies, starting a fruitful synergy between soft and hard X-rays.On one side, recent deep hard X-ray surveys confirmed the presence of a population of heavily obscured AGN: related to this, I will present the results coming from a deep NuSTAR survey of the UKIDSS-UDS field, as well as the aggregated results in the COSMOS, ECDFS and UDS fields obtained exploiting three new hard NuSTAR bands, focusing on an interesting source in the COSMOS field barely detected by Chandra due to heavy obscuration, but standing out in the NuSTAR 8-16 keV band.On the other side, the first steps and perspectives for a new Chandra survey in the central 6 deg^2 of the Bootes field (the Chandra Deep Wide Field Survey, CDWFS) will be discussed. The CDWFS will take advantage of the exquisite Chandra angular resolution and sensitivity in order to study in detail the large-scale clustering of AGN and their Eddington-ratio distribution.
- Publication:
-
42nd COSPAR Scientific Assembly
- Pub Date:
- July 2018
- Bibcode:
- 2018cosp...42E2193M