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arXiv 1902.09370astro-ph.GA
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从kpcs到NGC 1097的中央秒差距：同时喂养恒星形成和黑洞

From kpcs to the central parsec of NGC 1097: feeding star formation and a black hole at the same time

M. Almudena Prieto, Juan A. Fernandez-Ontiveros, Gustavo Bruzual, Andreas Burkert, Marc Schartmann, Stephan Charlot

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16 pages, 9 color figures. To appear in MNRAS
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摘要：

本文给出了NGC 1097星系中央千秒差距恒星形成环和馈送过程的全色图象。在$\sim$ 10 pc的分辨率下，红外到紫外图像的组合使我们能够识别环中大约250个星团的数量，并解开包裹和喂养它们的尘埃和气体细丝网络。在过去的1亿年里，这个环是一个间歇性恒星爆发的地方。四个主要的情节，涵盖了原星系团阶段的11个中红外源的分子云的核心，和两（三）以前的爆发与时间间隔为20 - 30万年的确定。内部几千秒差距的消光图将NGC 1097的两条主要尘埃带分解为一束束狭窄的、$<$ 25秒差距宽的、沿着星系棒延伸的细丝。当它们接近环时，一些沿着环旋转，另一些则弯曲到中心，形成核螺旋。我们相信这些是kpc级的尘埃气体流为环和黑洞提供能量。在过去的1亿年里，环中形成的星团的总质量是$< 10^7\, \rm{M_\odot}$，即环中分子气体的$10^{9} M_\odot$的$< 1\% $;然而，按照目前的恒星形成速率$\sim1.8\, \rm{M_\odot \, yr^{-1}}$，在这段时间里，恒星质量应该高出一个数量级。这意味着环中气体的可用性并不是恒星形成的唯一驱动力，也许致密气体在环中积累的速度才是关键。

英文摘要：

A panchromatic view of the star forming ring and feeding process in the central kpc of the galaxy NGC 1097 is presented. The assembled IR to UV images at $\sim$10 pc resolution allow us to characterise the population of circa 250 clusters in the ring and disentangle the network of filaments of dust and gas that enshroud and feed them. The ring is a place of intermittent star bursts over the last 100 Myr. Four major episodes covering a proto-cluster phase of eleven mid-IR sources at the molecular clouds core, and two (three) previous bursts with a time separation of 20 - 30 Myr are identified. The extinction map of the inner few kpc resolves NGC1097's two major dust lanes in bundles of narrow, $<$25 pc width, filaments running along the galaxy's bar. As they approach the ring, some circularise along it, others curve to the centre to produce a nuclear spiral. We believe these are kpc-scale dust-gas streamers feeding the ring and the black-hole. The total mass in clusters formed in the ring in the last 100 Myr is $< 10^7\, \rm{M_\odot}$, i.e. $< 1\% $ of the $10^{9} M_\odot$ of molecular gas in the ring; yet, at its current star formation rate, $\sim1.8\, \rm{M_\odot \, yr^{-1}}$, an order of magnitude more in stellar mass should have been produced over that period. This means that the availability of gas in the ring is not the sole star formation driver, perhaps the rate at which dense gas accumulates in the ring is key.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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