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arXiv 2102.05972astro-ph.SRastro-ph.GA
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R136核的高对比度和高分辨率近红外测光

High contrast and resolution near infrared photometry of the core of R136

Zeinab Khorrami, Maud Langlois, Paul C. Clark, Farrokh Vakili, Anne S. M. Buckner, Marta Gonzalez, Paul Crowther, Richard Wunsch, Jan Palous, Stuart Lumsden, Estelle Moraux

摘要:

我们提出了最尖锐和最深的近红外光度分析的核心R136,一个新形成的大质量星团的中心的30剑鱼座恒星形成区的大麦云。我们使用了ESO甚大望远镜上实现的SPHERE聚焦仪器的极端自适应光学,并在其IRDIS成像模式下操作,第二次在H和K滤波器中具有更长的曝光时间。我们的目标是(i)增加R136核心中分辨源的数量,以及(ii)与第一个历元进行比较,对两个历元之间检测到的共同源的属性进行分类。在10.8“x12.1”(2.7pc x3.0pc)的视场(FOV)内,我们在H和K滤波器中检测到1499个源,其中76%的源具有小于0.2”的视觉同伴。检测到的源的数量更大,使我们能够更好地采样质量函数(MF)。MF斜率估计年龄为1,1.5和2百万年,在不同的半径,并为不同的质量范围。对于整个视场和不同半径,质量范围为10-300太阳质量的MF斜率比质量范围为3-300太阳质量的MF斜率陡约0.3倍。比较两个时期共有的790个源的JHK颜色,在外部区域(r >3”)检测到的67%的源与1- 200万年的演化模型不一致,并且与平均星团值相似,这表明起源于30剑鱼座内正在进行的恒星形成,与R136无关。

英文摘要:

We present the sharpest and deepest near infrared photometric analysis of the core of R136, a newly formed massive star cluster at the centre of the 30 Doradus star forming region in the Large Magellanic Cloud. We used the extreme adaptive optics of the SPHERE focal instrument implemented on the ESO Very Large Telescope and operated in its IRDIS imaging mode, for the second time with longer exposure time in the H- and K filters. Our aim was to (i) increase the number of resolved sources in the core of R136, and (ii) to compare with the first epoch to classify the properties of the detected common sources between the two epochs. Within the field of view (FOV) of 10.8"x12.1" (2.7pc x3.0pc), we detected 1499 sources in both H and K filters, for which 76% of these sources have visual companions closer than 0.2". The larger number of detected sources, enabled us to better sample the mass function (MF). The MF slopes are estimated at ages of 1, 1.5 and 2 Myr, at different radii, and for different mass ranges. The MF slopes for the mass range of 10-300 solar-mass are about 0.3 dex steeper than the mass range of 3-300 solar-mass, for the whole FOV and different radii. Comparing the JHK colours of 790 sources common in between the two epochs, 67% of detected sources in the outer region (r >3") are not consistent with evolutionary models at 1-2 Myr and with extinctions similar to the average cluster value, suggesting an origin from ongoing star formation within 30 Doradus, unrelated to R136.

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