红移4<z<6.5星系星际介质中尘埃颗粒的生长
Dust grain growth in the interstellar medium of galaxies at redshifts 4<z<6.5
摘要：
区分不同的粉尘形成过程是了解其性质的关键问题。我们分析了6个红移为4<z<5的亚毫米星系和9个红移为5<z<6.4的类星体。我们估计他们的尘埃质量从他们的（亚）毫米发射和他们的恒星质量的光谱能量分布建模或从动力学和气体质量从CO线检测。我们计算了每个AGB恒星和每个SN的尘埃产量，以解释这些尘埃质量，并得出结论，AGB恒星是不够有效的，在大多数这些星系形成尘埃。SN可能是粉尘产生的原因，但只有在SN冲击中的粉尘破坏不被考虑在内的情况下。否则，即使是SNe也不够有效，这就提倡使用其他一些粉尘产生机制。我们提出的假设，颗粒生长的星际介质是负责大部分的尘埃质量积累在这些星系。
英文摘要：
To discriminate between different dust formation processes is a key issue in order to understand its properties. We analysed six submillimeter galaxies at redshifts 4<z<5 and nine quasars at 5<z<6.4. We estimated their dust masses from their (sub)millimeter emission and their stellar masses from the spectral energy distribution modelling or from the dynamical and gas masses obtained from the CO line detections. We calculated the dust yields per AGB star and per SN required to explain these dust masses and concluded that AGB stars are not efficient enough to form dust in the majority of these galaxies. SN could be responsible for dust production, but only if dust destruction in the SN shocks is not taken into account. Otherwise even SNe are not efficient enough, which advocates for some other dust production mechanism. We present the hypothesis that grain growth in the interstellar medium is responsible for bulk of the dust mass accumulation in these galaxies.
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