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.

infrared: galaxies

quasars: general

galaxies: active

galaxies: star formation

quasars: supermassive black holes

X-rays: galaxies


Agnese Del Moro

Max Planck-institutet

David M. Alexander

Durham University

Franz E. Bauer

Space Science Institute


Pontificia Universidad Catolica de Chile

Millennium Institute of Astrophysics

Emanuele Daddi

Université Paris Diderot-Paris 7

Dale D. Kocevski

University of Kentucky

Flora Stanley

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

Daniel H. McIntosh

University of Missouri

Frontiers in Astronomy and Space Sciences

2296-987X (ISSN)

Vol. 4


Oorganisk kemi

Astronomi, astrofysik och kosmologi

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