作为恒星形成指示器的射电-X射线关系：VLA巡天的结果
The Radio - X-ray relation as a star formation indicator: Results from the VLA--E-CDFS Survey
摘要：
为了追踪高红移下的瞬时恒星形成率，从而帮助理解与恒星形成相关的不同发射机制之间的关系，我们结合了最近的4 Ms Chandra X射线数据和扩展Chandra深场南部地区的深VLA射电数据。我们发现在X射线和无线电波段检测到268个源。在我们的样本中的源的$\sim 95$的红移的可用性，使我们能够获得可靠的光度估计和X射线分析的大多数对象的内在属性。为了在两个波段选择由恒星形成提供动力的源，我们采用了基于X射线和射电数据的分类标准，利用了X射线光谱特征和时间变化，利用了分散在十多年内的观测。我们确定了43个与恒星形成有关的物体。我们还增加了另外111和70只在无线电或X射线波段检测到的恒星形成候选人，分别。我们发现，在三个数量级以上，直到$z \sim 1.5$的恒星形成星系中，射电和X射线光度之间存在明显的线性相关。我们还测量了一个显着的分散的顺序为0.4德克斯，高于在低红移观察到的，这意味着一个内在的散射组件。关联与局域测量结果一致，没有观测到随红移的演化。利用局部校准的SFR与射电光度的关系，研究了高红移下的L_X（2- 10 keV）-SFR关系。对银河系和M31这两个典型的旋涡星系的恒星形成率的测量结果与一些理论模型的比较表明，利用现有的数据，我们只能追踪z<0.2的典型旋涡星系，以及恒星形成率高达$\sim 100 M_\odot yr^{-1}$到$z\sim 1.5$的强星暴星系。
英文摘要：
In order to trace the instantaneous star formation rate at high redshift, and hence help understanding the relation between the different emission mechanisms related to star formation, we combine the recent 4 Ms Chandra X-ray data and the deep VLA radio data in the Extended Chandra Deep Field South region. We find 268 sources detected both in the X-ray and radio band. The availability of redshifts for $\sim 95$ of the sources in our sample allows us to derive reliable luminosity estimates and the intrinsic properties from X-ray analysis for the majority of the objects. With the aim of selecting sources powered by star formation in both bands, we adopt classification criteria based on X-ray and radio data, exploiting the X-ray spectral features and time variability, taking advantage of observations scattered across more than ten years. We identify 43 objects consistent with being powered by star formation. We also add another 111 and 70 star forming candidates detected only in the radio or X-ray band, respectively. We find a clear linear correlation between radio and X-ray luminosity in star forming galaxies over three orders of magnitude and up to $z \sim 1.5$. We also measure a significant scatter of the order of 0.4 dex, higher than that observed at low redshift, implying an intrinsic scatter component. The correlation is consistent with that measured locally, and no evolution with redshift is observed. Using a locally calibrated relation between the SFR and the radio luminosity, we investigate the L_X(2-10keV)-SFR relation at high redshift. The comparison of the star formation rate measured in our sample with some theoretical models for the Milky Way and M31, two typical spiral galaxies, indicates that, with current data, we can trace typical spirals only at z<0.2, and strong starburst galaxies with star-formation rates as high as $\sim 100 M_\odot yr^{-1}$, up to $z\sim 1.5$.
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