Star Formation at z = 2.481 in the Lensed Galaxy SDSS J1110+6459. II. What is Missed at the Normal Resolution of the Hubble Space Telescope?
Star Formation at z = 2.481 in the Lensed Galaxy SDSS J1110+6459. II. What is Missed at the Normal Resolution of the Hubble Space Telescope?
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透镜星系 SDSS J1110 6459 中 z = 2.481 处的恒星形成。
DOI：
10.3847/1538-4357/aa775e
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
E. Wuyts
中科院分区：
文献类型：
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作者：
J. Rigby;T. Johnson;K. Sharon;K. Whitaker;K. Whitaker;M. Gladders;M. Florian;J. Lotz;M. Bayliss;E. Wuyts
对于红移z = 2.481的透镜星系SGAS J111020.0+645950.8，放大倍数为28 ± 8，我们分析了星星形成的形态，如在高度放大的源平面和模拟中的静止帧紫外辐射所追踪的，该星系在没有透镜放大的情况下将如何出现。如果这个星系没有透镜，而是从哈勃太空望远镜的深视场中绘制出来，我们可以得出结论，几乎所有的星星形成都来自一个指数盘（Sérsic指数为1.0 ± 0.4），其有效半径是通过使用Galfit对F606 W进行二维拟合来测量的，并通过将径向轮廓拟合到F606 W椭圆等照度线来测量。在深场的正常空间分辨率下，SGAS J111020.0+645950.8内没有星团星星形成的迹象。然而，引力透镜增强的空间分辨率讲述了一个非常不同的故事;大部分星星形成于24个大小为r = 30-50 pc的团块中，分布在7 kpc的星系长度上。漫反射分量的颜色和空间分布表明，还有更小的团块未被解析。尽管有这种杂乱的、杂乱的形态，但径向轮廓仍然具有指数轮廓的良好特征。在这个透镜星系中，恒星正在形成大小远低于100 pc的复合体;这样的大小完全没有被银河系演化的调查所探索。
For lensed galaxy SGAS J111020.0+645950.8 at redshift z = 2.481, which is magnified by a factor of 28 ± 8, we analyze the morphology of star formation, as traced by rest-frame ultraviolet emission, in both the highly magnified source plane and simulations of how this galaxy would appear without lensing magnification. Were this galaxy not lensed, but rather drawn from a Hubble Space Telescope deep field, we would conclude that almost all its star formation arises from an exponential disk (Sérsic index of 1.0 ± 0.4) with an effective radius of measured from two-dimensional fitting to F606W using Galfit, and measured by fitting a radial profile to F606W elliptical isophotes. At the normal spatial resolution of the deep fields, there is no sign of clumpy star formation within SGAS J111020.0+645950.8. However, the enhanced spatial resolution enabled by gravitational lensing tells a very different story; much of the star formation arises in two dozen clumps with sizes of r = 30–50 pc spread across the 7 kpc length of the galaxy. The color and spatial distribution of the diffuse component suggests that still-smaller clumps are unresolved. Despite this clumpy, messy morphology, the radial profile is still well-characterized by an exponential profile. In this lensed galaxy, stars are forming in complexes with sizes well below 100 pc; such sizes are wholly unexplored by surveys of galaxy evolution at .
DOI：
10.1088/0004-637x/739/1/45
发表时间：
2011-04
期刊：
The Astrophysical Journal
影响因子：
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作者：
N. F. Schreiber;A. Shapley;R. Genzel;N. Bouché;G. Cresci;R. Davies;D. Erb;S. Genel;D. Lutz
通讯作者：
N. F. Schreiber;A. Shapley;R. Genzel;N. Bouché;G. Cresci;R. Davies;D. Erb;S. Genel;D. Lutz