Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2018

The host galaxies of luminous type 2 AGN at z ∼0.3-0.4

Résumé

We study the morphological and structural properties of the host galaxies associated with 57 optically-selected luminous type 2 AGN at z∼0.3-0.4: 16 high-luminosity Seyfert 2 (HLSy2, 8.0≤log(L[OIII]/L⊙)<8.3) and 41 obscured quasars (QSO2, log(L[OIII]/L⊙)≥8.3). With this work, the total number of QSO2 at z<1 with parametrized galaxies increases from ∼35 to 76. Our analysis is based on HST WFPC2 and ACS images that we fit with {\sc GALFIT}. HLSy2 and QSO2 show a wide diversity of galaxy hosts. The main difference lies in the higher incidence of highly-disturbed systems among QSO2. 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 spheoridal component spread across the total range of L[OIII], most disk-dominated galaxies concentrate at log(L[OIII]/L⊙)<8.6. This is expected if more powerful AGN 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 HLSy2 and 3.9±0.6 kpc for HLSy2 and QSO2 respectively. These are significantly smaller than those found for QSO1 and narrow line radio galaxies at similar z. We put the results of our work in context of related studies of AGN with quasar-like luminosities.

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hal-02094532 , version 1 (09-04-2019)

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J J Urbano-Mayorgas, M. Villar Martín, F Buitrago, J Piqueras López, B Rodríguez del Pino, et al.. The host galaxies of luminous type 2 AGN at z ∼0.3-0.4. Monthly Notices of the Royal Astronomical Society, 2018, 483 (2), pp.1829-1849. ⟨10.1093/mnras/sty2910⟩. ⟨hal-02094532⟩
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