Extreme star formation in the Milky Way: luminosity distributions of young stellar objects in W49A and W51

Extreme star formation in the Milky Way: luminosity distributions of young stellar objects in W49A and W51
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银河系中的极端恒星形成:W49A和W51中年轻恒星的光度分布

DOI:
10.1093/mnras/sty606
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发表时间:
2018
影响因子:
4.8
通讯作者:
Eden D
Eden D
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Eden D

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我们利用赫歇尔红外银道巡天(Hi-GAL)的远红外数据和詹姆斯·克拉克麦克斯韦望远镜(JCMT)850米的观测数据比较了W 49 A和W51区域的恒星形成性质,分别获得了相关致密源的光度和质量。前者是来自Elia等人目录的红外光度,而后者来自JCMT平面测量源目录以及来自新数据的测量。两个区域的团块质量分布被发现是相互一致的,因为是团块形成效率和恒星形成效率的类似物。然而,年轻恒星天体的光度的频率分布是显着不同的。虽然W51的光度分布与银河系范围内的样本一致,但W 49 A的光度分布是头重脚轻的。差异并不明显,主要集中在W 49 A的中心区域。然而,他们认为那里的物理条件,部分与河外恒星爆发的物理条件相当,正在显着影响该地区致密团块的恒星形成特性或演化。
We have compared the star-formation properties of the W49A and W51 regions by using far-infrared data from theHerschelinfrared Galactic Plane Survey (Hi-GAL) and 850-m observations from the James Clerk Maxwell Telescope (JCMT) to obtain luminosities and masses, respectively, of associated compact sources. The former are infrared luminosities from the catalogue of Elia et al., while the latter are from the JCMT Plane survey source catalogue as well as measurements from new data. The clump-mass distributions of the two regions are found to be consistent with each other, as are the clump-formation efficiency and star-formation efficiency analogues. However, the frequency distributions of the luminosities of the young stellar objects are significantly different. While the luminosity distribution in W51 is consistent with Galaxy-wide samples, that of W49A is top heavy. The differences are not dramatic and are concentrated in the central regions of W49A. However, they suggest that physical conditions there, which are comparable in part to those in extragalactic starbursts, are significantly affecting the star-formation properties or evolution of the dense clumps in the region.
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