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首页> 外文期刊>The Astrophysical journal >THE MAGELLANIC INTER-CLOUD PROJECT (MAGIC). I. EVIDENCE FOR INTERMEDIATE-AGE STELLAR POPULATIONS IN BETWEEN THE MAGELLANIC CLOUDS
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THE MAGELLANIC INTER-CLOUD PROJECT (MAGIC). I. EVIDENCE FOR INTERMEDIATE-AGE STELLAR POPULATIONS IN BETWEEN THE MAGELLANIC CLOUDS

机译:麦哲伦云间项目(MAGIC)。 I.麦哲伦群之间的中年星空人口的证据

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摘要

The origin of the gas in between the Magellanic Clouds (MCs)—known as the "Magellanic Bridge" (MB)—is puzzling. Numerical simulations suggest that the MB formed from tidally stripped gas and stars in a recent interaction between the MCs. However, the apparent lack of stripped intermediate- or old-age stars associated with the MB is at odds with this picture. In this paper, we present the first results from the MAGellanic Inter-Cloud program (MAGIC) aimed at probing the stellar populations in the inter-Cloud region. We present observations of the stellar populations in two large fields located in between the Large and Small Magellanic Clouds (LMC/SMC), secured using the WFI camera on the 2.2?m telescope in La Silla. Using a synthetic color-magnitude diagram technique, we present the first quantitative evidence for the presence of intermediate-age and old stars in the inter-Cloud region. The intermediate-age stars—which make up ~28% of all stars in the region—are not present in fields at a similar distance from the SMC in a direction pointing away from the LMC. This provides potential evidence that these intermediate-age stars could have been tidally stripped from the SMC. However, spectroscopic studies will be needed to confirm or rule out the tidal origin for the inter-Cloud gas and stars.
机译:麦哲伦云(MC)之间的气体起源(被称为“麦哲伦桥”(MB))令人困惑。数值模拟表明,在MC之间最近的相互作用中,由潮汐剥离的气体和恒星形成的MB。然而,与MB相关的明显缺少中,老年恒星的剥离与这张照片相矛盾。在本文中,我们提出了麦哲伦星际云计划(MAGIC)的第一个结果,旨在探测云间地区的恒星种群。我们介绍了在大和小的麦哲伦星云(LMC / SMC)之间的两个大视野中的恒星种群的观测结果,这些观测器使用La Silla的2.2?m望远镜上的WFI摄像机固定。使用合成的色度图技术,我们提出了云间区域中存在中年和老恒星的第一个定量证据。中等年龄的恒星(约占该区域所有恒星的28%)不在远离LMC的方向上与SMC距离相近的区域中。这提供了潜在证据,证明这些中年恒星可能已经从SMC中经过潮汐剥离。但是,将需要光谱研究来确认或排除云间气体和恒星的潮汐起源。

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