The Spiderweb Protocluster in X-ray: AGN activity and diffuse baryons
Abstract
We present an overview of the Spiderweb Protocluster at z~2.156, mostly based on the new 700 ks Chandra observation of the field around the Spiderweb Galaxy. We find 13 X-ray emitting protocluster members distributed approximately over a ~3.2 X 1.3 Mpc2 region, with Seyfert-like luminosity, half of them strongly absorbed. The X-ray AGN fraction is measured to be (25.5 +- 4.5)% in the stellar mass range log(M_*/M_sun)>10.5. This value corresponds to an enhancement factor of 6.0 (3.0-15.0 at 1 sigma c.l.) for the nuclear activity with respect to the COSMOS field at comparable redshift and stellar mass range. Thanks to the exquisite Chandra angular resolution, we are able to identify diffuse, Inverse-Compton emission associated to the radio jets in the Spiderweb Galaxy, and also a ~2 keV thermal component, consistent with a virialized halo of ~4 X 10^13 M_sun. Taken together, our results shows a rapidly evolving environment that is shaping the BH/galaxy population on Mpc scales and regulating the baryon cycle in the central ~ 100 kpc regions. The properties of the Spiderweb complex are discussed in the context of protocluster studies.
- Publication:
-
44th COSPAR Scientific Assembly. Held 16-24 July
- Pub Date:
- July 2022
- Bibcode:
- 2022cosp...44.2342T