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Minkowski's Object: A Starburst Triggered by a Radio Jet, Revisited

机译:闵可夫斯基的物体:由无线电喷气机触发的星暴,再探

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摘要

We present neutral hydrogen, ultraviolet, optical and near-infrared imaging, and optical spectroscopy, of Minkowski's Object (MO), a star forming peculiar galaxy near NGC 541. The observations strengthen evidence that star formation in MO was triggered by the radio jet from NGC 541. Key new results are the discovery of a 4.9E8 solar mass double HI cloud straddling the radio jet downstream from MO, where the jet changes direction and decollimates; strong detections of MO, also showing double structure, in UV and H-alpha; and numerous HII regions and associated clusters in MO. In UV, MO resembles the radio-aligned, rest-frame UV morphologies in many high redshift radio galaxies (HzRGs), also thought to be caused by jet-induced star formation. MO's stellar population is dominated by a 7.5 Myr-old, 1.9E7 solar mass instantaneous burst, with current star formation rate 0.52 solar masses per year (concentrated upstream from where the HI column density is high). This is unlike the jet-induced star formation in Centaurus A, where the jet interacts with pre-existing cold gas; in MO the HI may have cooled out of a warmer, clumpy intergalactic or interstellar medium as a result of jet interaction, followed by collapse of the cooling clouds and subsequent star formation (consistent with numerical simulations). Since the radio source that triggered star formation in MO is much less luminous, and therefore more common, than powerful HzRGs, and because the environment around MO is not particularly special in terms of abundant dense, cold gas, jet-induced star formation in the early universe might be even more prevalent than previously thought.
机译:我们介绍了Minkowski的天体(MO)的中性氢,紫外线,光学和近红外成像以及光谱学,这是NGC 541附近形成恒星的特殊星系。这些观测结果进一步证明了MO中的恒星形成是由来自NGC541。新的关键结果是发现了一个4.9E8太阳质量双HI云横跨MO下游的无线电射流,该射流改变方向并准直。在紫外线和H-alpha中,对MO的强检测也显示出双重结构;以及MO中的许多HII区域和相关的群集。在紫外线中,MO类似于许多高红移射电星系(HzRGs)中的无线电定线,静止帧紫外线形态,这也被认为是由射流诱发的恒星形成引起的。 MO的恒星种群主要由7.5 Myr的1.9E7太阳质量瞬时爆发控制,当前恒星形成率每年为0.52太阳质量(集中在HI柱密度高的上游)。这与半人马座A中由喷流引起的恒星形成不同,在Centaurus A中,喷流与预先存在的冷气相互作用。在MO中,由于喷流相互作用,HI可能已经从温暖,结块的星际或星际介质中冷却下来,随后冷却云坍塌并随后形成恒星(与数值模拟一致)。由于在MO中触发恒星形成的无线电源比强大的HzRGs发光要少得多,因此更为普遍,并且因为MO周围的环境就致密,冷气,射流引起的恒星形成而言并不是特别特殊。早期宇宙可能比以前认为的更为普遍。

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