Luminous and Obscured Quasars and Their Host Galaxies

Frontiers in Astronomy and Space Sciences

Bauer, Franz E.⁵  Daddi, Emanuele⁷  Del Moro, Agnese⁸  McIntosh, Daniel H.^1,11  Alexander, David M.^1,12  Kocevski, Dale D.^1,13  Stanley, Flora^1,14 

[1] Paris Diderot, Sorbonne Paris CitéParis-Saclay, Université, CNRS, France;CEA, IRFU, DAp, AIM, UniversitéDepartment of Physics, Centre for Extragalactic Astronomy, Durham University, United Kingdom;EMBIGGEN Anillo, Chile;Facultad de FíMax-Planck-Institut füMillennium Institute of Astrophysics (MAS), Chile;Space Science Institute, United States;lica de Chile, Chile;r Extraterrestrische Physik, Germany;sica, Instituto de Astrofísica, Pontificia Universidad Cató

关键词: galaxies: active;    quasars: general;    Quasars: supermassive black holes;    X-rays: galaxies;    infrared: galaxies;    galaxies: star formation;   

DOI  :  10.3389/fspas.2017.00067

学科分类：空间科学

来源: Frontiers

【 摘 要 】

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 ≈ 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.

【 授权许可】

CC BY