Luminous and Obscured Quasars and Their Host Galaxies
Artikel i vetenskaplig tidskrift, 2018

The most heavily-obscured, luminous quasars might represent a specific phase of the evolution of the actively accreting supermassive black holes and their host galaxies, possibly related to mergers. We investigated a sample of the most luminous quasars at z approximate to 1 - 3 in the GOODS fields, selected in the mid-infrared band through detailed spectral energy distribution (SED) decomposition. The vast majority of these quasars (-80%) are obscured in the X-ray band and 30% of them to such an extent, that they are undetected in some of the deepest (2 and 4 Ms) Chandra X-ray data. Although no clear relation is found between the star-formation rate of the host galaxies and the X-ray obscuration, we find a higher incidence of heavily-obscured quasars in disturbed/merging galaxies compared to the unobscured ones, thus possibly representing an earlier stage of evolution, after which the system is relaxing and becoming unobscured.

quasars: general

X-rays: galaxies

infrared: galaxies

quasars: supermassive black holes

galaxies: active

galaxies: star formation


Agnese Del Moro


David M. Alexander

Durham University

Franz E. Bauer


Space Science Institute

Pontificia Universidad Catolica de Chile

Instituto Milenio de Astrofísica

Emanuele Daddi

Université Paris Diderot

Dale D. Kocevski

University of Kentucky

Flora Stanley

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

Daniel H. McIntosh

University of Missouri

Frontiers in Astronomy and Space Sciences

2296987X (eISSN)

Vol. 4


Oorganisk kemi

Astronomi, astrofysik och kosmologi

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