本文選題：星系　切入點(diǎn)：演化　出處：《天文學(xué)報(bào)》2014年02期

【摘要】：為了理解銀盤的徑向豐度梯度形成機(jī)制及冷氣體演化,構(gòu)建了銀盤化學(xué)演化模型.模型中采用了與分子氫相關(guān)的恒星形成律,分開計(jì)算了分子氫和原子氫的質(zhì)量面密度演化,并將模型預(yù)言和觀測到的各物理量徑向輪廓進(jìn)行了比較.結(jié)果表明,模型預(yù)言對所采用的內(nèi)落時(shí)標(biāo)非常敏感,采用與分子氫相關(guān)的恒星形成律的模型能夠較好地符合銀盤基本的觀測特征,尤其是能夠自然地得到銀盤的徑向氧豐度梯度和冷氣體的徑向面密度輪廓.采用瞬時(shí)或非瞬時(shí)循環(huán)假設(shè)對冷氣體的演化影響不大,在氣體密度較低的情況下更是如此.
[Abstract]:In order to understand the radial abundance gradient formation mechanism of silver disk and the cold gas evolution, a silver disk chemical evolution model was constructed. The star formation law related to molecular hydrogen was used in the model, and the mass surface density evolution of molecular hydrogen and atomic hydrogen were calculated separately. The model predictions are compared with the observed radial profiles of physical quantities. The results show that the model predictions are very sensitive to the falling time scales used. The model of star formation law related to molecular hydrogen can better accord with the basic observation characteristics of silver disk. Especially, the radial oxygen abundance gradient of silver disk and the radial surface density profile of cold gas can be obtained naturally. The instantaneous or non-instantaneous cycle assumption has little effect on the evolution of cold gas, especially when the gas density is low.
【作者單位】： 中國科學(xué)院上海天文臺(tái);中國科學(xué)院大學(xué);
【基金】：國家自然科學(xué)基金項(xiàng)目(Y345321001)資助
【分類號(hào)】：P156

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本文編號(hào)：1675743