在具有9.7 μ m硅酸盐深吸收的z~2超高速红外星系中发现射电喷流
Discovery of Radio Jets in z~2 ULIRGs with Deep 9.7um Silicate Absorption
摘要：
最近的Spitzer观测发现了大量的具有深硅酸盐吸收（τ 9.7>1）的z~2超晶格。本文报道了这样一个样品的20厘米射电研究，以阐明其物理性质。我们发现，在z~2处的深硅酸盐吸收ULIRGs中，相当一部分（40%）是中等射电强的，L_{1.4GHz} =10^{25}-10 ^<$26}WHz^{-1}。这与z<1的射电星系和射电噪类星体形成强烈对比，在这些射电星系和类星体中，没有一个具有可用IRS谱的源具有τ_{9.7}>1。此外，我们还在两个源中观测到射电喷流，其中一个源具有约200 kpc的双瓣结构，另一个源显示从核延伸约90 kpc的单侧喷流。后者可能的高倾角，加上其深硅酸盐吸收，意味着中红外遮蔽不与射电喷流共享一个轴。这些源是高度模糊的类星体，在射电源诞生后的过渡阶段被观测到，但在反馈效应消除ISM并停止黑洞吸积和星暴活动之前。
英文摘要：
Recent Spitzer observations have revealed a substantial population of z~2 ULIRGs with deep silicate absorption (τ_{9.7}>1). This paper reports a 20cm radio study of such a sample to elucidate their physical nature. We discover that a substantial fraction (40%) of deep silicate absorption ULIRGs at z~2 are moderately radio-loud with L_{1.4GHz}=10^{25}--10^{26}WHz^{-1}. This is in strong contrast with z<1 radio galaxies and radio-loud quasars where none of the sources with available IRS spectra have τ_{9.7}>1. In addition, we observe radio jets in two of our sources where one has a double lobe structure ~200kpc in extent, and another shows a one-sided jet extending ~90kpc from the nucleus. The likely high inclination of the latter, coupled with its deep silicate absorption, implies the mid-IR obscuration does not share an axis with the radio jets. These sources are highly obscured quasars, observed in the transition stage after the birth of the radio source, but before feedback effects dispel the ISM and halt the black hole accretion and starburst activity.
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