Clear evidence for the early triggering of a luminous quasar-like active galactic nuclei in a major, gas-rich merger
Clear evidence for the early triggering of a luminous quasar-like active galactic nuclei in a major, gas-rich merger
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明确的证据表明,在一次富含气体的大型合并中,早期触发了类发光类星体活动星系核
DOI:
10.1093/mnras/stt2333
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发表时间:
2014
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
We present deep, intermediate resolution, long slit Gemini GMOS-S optical spectra of the SDSS type II quasar J002531-104022, which is a highly disturbed system currently undergoing a major merger event. We use these data to model the ages and reddenings of the stellar populations in three distinct spatial regions and find a remarkable uniformity in the properties of the young stellar populations (YSP) that dominate the optical spectra. The YSPs are all found to have relatively young ages (tysp < 40$ Myr), strongly implying that the latest episode of star formation and quasar activity have been triggered quasi-simultaneously. The lack of reddening deduced from both continuum modelling and the measured Balmer decrements (E(B-V) <0.3) suggests that starburst and/or AGN induced outflows have already effectively removed a substantial proportion of the gas and dust from the central region. These findings starkly contrast with model predictions which suggest an offset of a few 100 Myr between the peak of merger induced star formation and the emergence of the optically visible quasar activity. Based on our stellar population fits we also show that the total stellar mass is in the range (4 - 17) X 10^10 solar masses, lower than typically found for quasar host galaxies.
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DOI:
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发表时间:
2002
期刊:
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作者:
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1995
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2012
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发表时间:
2008
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