Young stellar populations in type II quasars: timing the onset of star formation and nuclear activity
Young stellar populations in type II quasars: timing the onset of star formation and nuclear activity
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II 型类星体中的年轻恒星群:恒星形成和核活动开始的时间
DOI:
10.1093/mnras/stw3175
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发表时间:
2017
影响因子:
4.8
通讯作者:
Bessiere P
中科院分区:
文献类型:
--
作者:
Bessiere P
Despite the emerging morphological evidence that luminous quasar-like active galactic nuclei (AGN) are triggered in galaxy mergers, the natures of the triggering mergers and the order of events in the triggering sequence remain uncertain. In this work, we present a detailed study of the stellar populations of the host galaxies of 21 type II quasars, with the aim of understanding the sequence of events between the onset of the merger, the triggering of the associated starburst and the initiation of the quasar activity. To this end, we model high-quality, wide spectral coverage, intermediate-resolution optical spectra of the type II quasars. We find that of the 21 objects, the higher order Balmer absorption lines, characteristic of young stellar populations (YSPs), are directly detected in ∼62 per cent of the sample. We also fit these spectra using a number of combinations of stellar and/or power-law components, representative of viable formation histories, as well as including the possibility of scattered AGN light. We find that ∼90 per cent of the type II quasar host galaxies require the inclusion of a YSP to adequately model their spectra, whilst 71 per cent of the sample require the inclusion of a YSP with age <100 Myr. Since the ages of the YSP in most type II quasar host galaxies are comparable with the expected lifetimes of the AGN activity, these results provide strong evidence that the quasars are triggered close to the peaks of the merger-induced starbursts.
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DOI:
10.1111/j.1365-2966.2011.20082.x
发表时间:
2011
影响因子:
4.8
作者:
M. Swinbank;M. Balogh;R. Bower;A. Zabludoff;J. Lucey;S. McGee;C. Miller;R. Nichol;Icc;Durham;Waterloo;Arizona;Michigan.;Portsmouth
通讯作者:
Portsmouth
DOI:
--
发表时间:
2002
期刊:
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通讯作者:
T. Shanks
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发表时间:
1995
期刊:
影响因子:
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作者:
R. Dickson;C. Tadhunter;M. Shaw;N. Clark;R. Morganti
通讯作者:
R. Morganti
DOI:
--
发表时间:
2012
期刊:
影响因子:
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作者:
M. Villar;A. Cabrera;P. Bessiere;C. Tadhunter;M. Rose;C. Breuck
通讯作者:
C. Breuck
DOI:
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发表时间:
2008
期刊:
影响因子:
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作者:
K. Wills;C. Tadhunter;J. Holt;R. Delgado;K. Inskip;J. Zaurin;R. Morganti
通讯作者:
R. Morganti