Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12666/369
Title: | The host galaxies of luminous type 2 AGNs at z ∼ 0.3–0.4 |
Authors: | Urbano Mayorgas, J. J. Villar Martín, M. Buitrago, F. Piqueras López, J. Rodríguez del Pino, B. Koekemoer, A. M. Huertas Company, M. Domínguez Tenreiro, R. Carrera, F. J. Tadhunter, C. |
Keywords: | Galaxies: active;Galaxies: evolution;Quasars: general |
Issue Date: | 28-Feb-2019 |
Publisher: | Oxford Academics: Oxford University Press |
DOI: | 10.1093/mnras/sty2910 |
Published version: | https://academic.oup.com/mnras/article/483/2/1829/5145863 |
Citation: | Monthly Notices of the Royal Astronomical Society 483(2): 1829–1849(2019) |
Abstract: | We study the morphological and structural properties of the host galaxies associated with 57 optically selected luminous type 2 active galactic nuclei (AGNs) at z ∼ 0.3–0.4: 16 high-luminosity Seyfert 2 [HLSy2, 8.0 ≤ log(L[OIII]/L⊙)< 8.3] and 41 obscured [QSO2, log(L[OIII]/L⊙)≥ 8.3] quasars. With this work, the total number of QSO2s at z < 1 with parametrized galaxies increases from ∼35 to 76. Our analysis is based on Hubble Space Telescope WFPC2 and ACS images that we fit with GALFIT. HLSy2s and QSO2s show a wide diversity of galaxy hosts. The main difference lies in the higher incidence of highly disturbed systems among QSO2s. This is consistent with a scenario in which galaxy interactions are the dominant mechanism triggering nuclear activity at the highest AGN power. There is a strong dependence of galaxy properties with AGN power (assuming L[OIII] is an adequate proxy). The relative contribution of the spheroidal component to the total galaxy light (B/T) increases with L[OIII]. While systems dominated by the spheroidal component spread across the total range of L[OIII], most disc-dominated galaxies concentrate at log(L[OIII]/L⊙)<8.6. This is expected if more powerful AGNs are powered by more massive black holes which are hosted by more massive bulges or spheroids. The average galaxy sizes (〈re〉) are 5.0 ± 1.5 kpc for HLSy2s and 3.9 ± 0.6 kpc for HLSy2s and QSO2s, respectively. These are significantly smaller than those found for QSO1s and narrow-line radio galaxies at similar z. We put the results of our work in the context of related studies of AGNs with quasar-like luminosities. |
URI: | http://hdl.handle.net/20.500.12666/369 |
E-ISSN: | 1365-2966 |
ISSN: | 0035-8711 |
Appears in Collections: | (CAB) Artículos |
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