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首页> 外文期刊>The Astrophysical journal >RADIO PROPERTIES OF YOUNG STELLAR OBJECTS IN THE CORE OF THE SERPENS SOUTH INFRARED DARK CLOUD
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RADIO PROPERTIES OF YOUNG STELLAR OBJECTS IN THE CORE OF THE SERPENS SOUTH INFRARED DARK CLOUD

机译:南半球深红外云团中年轻恒星物体的放射特性

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摘要

We present deep radio continuum observations of the star-forming core of the Serpens South Infrared Dark Cloud with the Karl G. Jansky Very Large Array. Observations were conducted in two bands centered at 7.25 GHz (4.14 cm) and 4.75 GHz (6.31 cm) with a of 8.5 and 11.1 μJy/beam, respectively. We also use 2MASS, Spitzer and Herschel data to put our radio observations in the context of young stellar populations characterized by near and far-infrared observations. Within a 5'?×?5' region of interest around the central cluster, we detect roughly eighteen radio sources, seven of which we determine are protostellar in nature due to their radio spectral indices and their association with infrared sources. We find evidence for a previously undetected embedded Class 0 protostar and reaffirm Class 0 protostellar classifications determined by previous millimeter wavelength continuum studies. We use our infrared data to derive mid-infrared luminosities for three of our protostellar sources and find relative agreement between the known young stellar object (YSO) radio luminosity versus bolometric luminosity correlation. Lastly, we marginally detect an additional six radio sources at the 2–3σ level that lie within two arcseconds of infrared YSO candidates, providing motivation for higher sensitivity studies to clarify the nature of these sources and further probe embedded and/or low luminosity YSOs in Serpens South.
机译:我们用Karl G.Jansky超大型阵列对Serpens南红外暗云的恒星形成核心进行深层无线电连续观测。在以7.25 GHz(4.14 cm)和4.75 GHz(6.31 cm)为中心的两个频带中分别以8.5和11.1μJy/束的a进行观察。我们还使用2MASS,Spitzer和Herschel数据将我们的无线电观测结果放在以近红外和远红外观测为特征的年轻恒星种群的背景下。在中央星团周围的一个5'?×?5'感兴趣区域内,我们检测到大约18个无线电源,由于它们的无线电频谱指数以及它们与红外源的关系,我们确定其中有7个属于原恒星。我们找到了先前未被发现的嵌入式0级原星的证据,并重申了由先前毫米波波长连续体研究确定的0级原星分类。我们使用我们的红外数据来推导我们三个原恒星源的中红外光度,并找到已知的年轻恒星物体(YSO)的放射性光度与辐射热强度相关性之间的相对一致性。最后,我们在红外YSO候选物的两弧秒内以2–3σ的水平检测了另外六个无线电源,从而为进行更高灵敏度的研究提供了动力,以阐明这些源的性质,并进一步探测嵌入式和/或低发光度YSO。塞尔彭斯南部。

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