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Luminous and Obscured Quasars and Their Host Galaxies

Del Moro, Agnese; Alexander, David M.; Bauer, Franz E.; Daddi, Emanuele; Kocevski, Dale D.; Stanley, Flora; McIntosh, Daniel H.

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Agnese Del Moro

Franz E. Bauer

Emanuele Daddi

Dale D. Kocevski

Flora Stanley

Daniel H. McIntosh


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.

Journal Article Type Article
Acceptance Date Dec 18, 2017
Online Publication Date Jan 12, 2018
Publication Date Jan 12, 2018
Deposit Date Apr 13, 2018
Publicly Available Date Apr 13, 2018
Journal Frontiers in Astronomy and Space Sciences
Publisher Frontiers Media
Peer Reviewed Peer Reviewed
Volume 4
Article Number 67
Public URL


Published Journal Article (577 Kb)

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Copyright Statement
© 2018 Del Moro, Alexander, Bauer, Daddi, Kocevski, Stanley and McIntosh. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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