GLOBAL SPECTRAL ENERGY DISTRIBUTION OF THE CRAB NEBULA IN THE PROSPECT OF THE PLANCK SATELLITE POLARIZATION CALIBRATION
GLOBAL SPECTRAL ENERGY DISTRIBUTION OF THE CRAB NEBULA IN THE PROSPECT OF THE PLANCK SATELLITE POLARIZATION CALIBRATION
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DOI：
10.1088/0004-637x/711/1/417
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发表时间：
2008-02
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影响因子：
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通讯作者：
J. Macías-Pérez;F. Mayet;J. Aumont;F. Désert
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作者：
J. Macías-Pérez;F. Mayet;J. Aumont;F. Désert
在普朗克卫星偏振校准的框架内，我们对六十多年来蟹状星云光谱能量分布（SED）的频率范围从 1 到 106 GHz（从 299 到 2.99 × 10−4 mm）进行了研究。普朗克卫星任务在 30 至 857 GHz（从 9.99 至 0.3498 毫米）范围内观测天空，因此我们重点关注毫米区域。我们使用来自 23 至 94 GHz（从 13 至 3.18 毫米）的 WMAP 卫星的无线电和亚毫米数据、来自 143（2.1 毫米）至 545 GHz（0.55 毫米）之间的始祖气球实验的无线电数据和亚毫米数据，以及其他蟹状星云观测的概要。 Crab SED 与包含三个主要组件的模型进行了比较：负责低频和高频发射的同步加速器、解释 IRAS 卫星观测到的通量过剩的尘埃，以及毫米级的额外组件。从这一分析中，我们得出结论，蟹状星云在微波和毫米波长下的非偏振发射与在射电域中观察到的同步加速器发射相同。因此，我们预计蟹状星云的毫米波发射的偏振度和方向与射电发射相同。我们对由任何毫米额外分量在重建偏振度和角度时引起的可能误差设定上限为百分比水平。这一结果有力地支持了普朗克合作选择蟹状星云发射来在 30 (299 mm) 至 353 GHz (0.849 mm) 范围内执行偏振交叉检查。
Within the framework of the Planck satellite polarization calibration, we present a study of the Crab Nebula spectral energy distribution (SED) over more than six decades in frequency ranging from 1 to 106 GHz (from 299 to 2.99 × 10−4 mm). The Planck satellite mission observes the sky from 30 to 857 GHz (from 9.99 to 0.3498 mm) and therefore we focus on the millimeter region. We use radio and submillimeter data from the WMAP satellite between 23 and 94 GHz (from 13 to 3.18 mm), from the Archeops balloon experiment between 143 (2.1 mm) and 545 GHz (0.55 mm), and a compendium of other Crab Nebula observations. The Crab SED is compared to models including three main components: synchrotron that is responsible for the emission at low and high frequencies, dust that explains the excess of flux observed by the IRAS satellite, and an extra component on the millimeter regime. From this analysis, we conclude that the unpolarized emission of the Crab Nebula at microwave and millimeter wavelengths is the same synchrotron emission as the one observed in the radio domain. Therefore, we expect the millimeter emission of the Crab Nebula to be polarized with the same degree of polarization and orientation as the radio emission. We set upper limits on the possible errors induced by any millimeter extra component on the reconstruction of the degree and angle of polarization at the percent level as a maximum. This result strongly supports the choice by the Planck collaboration of the Crab Nebula emission for performing polarization cross-checks in the range 30 (299 mm) to 353 GHz (0.849 mm).