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The VMC survey – XLIII. The spatially resolved star formation history across the Large Magellanic Cloud
Monthly Notices of the Royal Astronomical Society ( IF 4.8 ) Pub Date : 2021-08-18 , DOI: 10.1093/mnras/stab2399
Alessandro Mazzi 1 , Léo Girardi 2 , Simone Zaggia 2 , Giada Pastorelli 3 , Stefano Rubele 2 , Alessandro Bressan 4 , Maria-Rosa L Cioni 5 , Gisella Clementini 6 , Felice Cusano 6 , João Pedro Rocha 7 , Marco Gullieuszik 2 , Leandro Kerber 7 , Paola Marigo 1 , Vincenzo Ripepi 8 , Kenji Bekki 9 , Cameron P M Bell 5 , Richard de Grijs 10, 11 , Martin A T Groenewegen 12 , Valentin D Ivanov 13, 14 , Joana M Oliveira 15 , Ning-Chen Sun 16 , Jacco Th van Loon 15
Affiliation  

We derive the spatially resolved star formation history (SFH) for a 96 deg2 area across the main body of the Large Magellanic Cloud (LMC), using the near-infrared photometry from the VISTA survey of the Magellanic Clouds (VMC). The data and analyses are characterized by a great degree of homogeneity and a low sensitivity to the interstellar extinction. 756 subregions of size 0.125 deg2 – corresponding to projected sizes of about $296\times 322\, \mathrm{pc}^{2}$ in the LMC – are analysed. The resulting SFH maps, with typical resolution of 0.2–0.3 dex in logarithm of age, reveal main features in the LMC disc at different ages: the patchy star formation at recent ages, the concentration of star formation on three spiral arms and on the Bar up to ages of ∼1.6 Gyr, and the wider and smoother distribution of older populations. The period of most intense star formation occurred roughly between 4 and 0.5 Gyr ago, at rates of $\sim \!0.3\, \mbox{$\mathrm{M}_{\odot }$}\mathrm{yr}^{-1}$. We compare young and old star formation rates with the observed numbers of RR Lyrae and Cepheids. We also derive a mean extinction and mean distance for every subregion, and the plane that best describes the spatial distribution of the mean distances. Our results cover an area about 50 per cent larger than the classical SFH maps derived from optical data. Main differences with respect to those maps are lower star formation rates at young ages, and a main peak of star formation being identified at ages slightly younger than 1 Gyr.

中文翻译:

VMC 调查 – XLIII。大麦哲伦星云的空间分辨恒星形成历史

我们使用来自麦哲伦星云 (VMC) 的 VISTA 调查的近红外光度法,推导出大麦哲伦星云 (LMC) 主体 96 度区域的空间分辨恒星形成历史 (SFH)。数据和分析的特点是同质化程度高,对星际灭绝的敏感性低。分析了 756 个大小为 0.125 deg2 的子区域 - 对应于 LMC 中约 $296\times 322\, \mathrm{pc}^{2}$ 的预计大小。由此产生的SFH图,典型分辨率为0.2-0.3 dex的年龄对数,揭示了LMC盘在不同年龄的主要特征:最近年龄的斑块状恒星形成,三个旋臂和棒上的恒星形成集中高达~1.6 Gyr的年龄,以及更广泛和更平滑的老年人口分布。最强烈的恒星形成时期大约发生在 4 到 0.5 Gyr 之前,速率为 $\sim \!0.3\, \mbox{$\mathrm{M}_{\odot }$}\mathrm{yr}^{ -1}$。我们将年轻和年老的恒星形成率与观测到的天琴座 RR 和造父变星的数量进行比较。我们还推导出每个子区域的平均消光和平均距离,以及最能描述平均距离空间分布的平面。我们的结果覆盖的区域比源自光学数据的经典 SFH 地图大约 50%。与这些地图的主要区别在于年轻时恒星形成率较低,并且在年龄略小于 1 Gyr 时确定了恒星形成的主峰。我们将年轻和年老的恒星形成率与观测到的天琴座 RR 和造父变星的数量进行比较。我们还推导出每个子区域的平均消光和平均距离,以及最能描述平均距离空间分布的平面。我们的结果覆盖的区域比源自光学数据的经典 SFH 地图大约 50%。与这些地图的主要区别在于年轻时恒星形成率较低,并且在年龄略小于 1 Gyr 时确定了恒星形成的主峰。我们将年轻和年老的恒星形成率与观测到的天琴座 RR 和造父变星的数量进行比较。我们还推导出每个子区域的平均消光和平均距离,以及最能描述平均距离空间分布的平面。我们的结果覆盖的区域比源自光学数据的经典 SFH 地图大约 50%。与这些地图的主要区别在于年轻时恒星形成率较低,并且在年龄略小于 1 Gyr 时确定了恒星形成的主峰。我们的结果覆盖的区域比源自光学数据的经典 SFH 地图大约 50%。与这些地图的主要区别在于年轻时恒星形成率较低,并且在年龄略小于 1 Gyr 时确定了恒星形成的主峰。我们的结果覆盖的区域比源自光学数据的经典 SFH 地图大约 50%。与这些地图的主要区别在于年轻时恒星形成率较低,并且在年龄略小于 1 Gyr 时确定了恒星形成的主峰。
更新日期:2021-08-18
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