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Luminous and Obscured Quasars and Their Host Galaxies
- Source :
- Frontiers in Astronomy and Space Sciences, Vol 4 (2018)
- Publication Year :
- 2018
- Publisher :
- Frontiers Media S.A., 2018.
-
Abstract
- 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.
Details
- Language :
- English
- ISSN :
- 2296987X
- Volume :
- 4
- Database :
- Directory of Open Access Journals
- Journal :
- Frontiers in Astronomy and Space Sciences
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.f0a2b7b4ee8a421697367e2d9a75f6b3
- Document Type :
- article
- Full Text :
- https://doi.org/10.3389/fspas.2017.00067