A Constraint on Primordial B-modes from the First Flight of the Spider Balloon-borne Telescope
A Constraint on Primordial B-modes from the First Flight of the Spider Balloon-borne Telescope
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DOI：
10.3847/1538-4357/ac20df
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发表时间：
2021-03
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通讯作者：
S. C. P. A. R. Ade;M. Amiri;S. Benton;A. Bergman;R. Bihary;J. Bock;J. Bond;J. A. Bonetti;S. Bryan;H. Chiang;C. Contaldi;O. Dor'e;A. Duivenvoorden;H. Eriksen;M. Farhang;J. Filippini;A. Fraisse;K. Freese;M. Galloway;A. Gambrel;N. Gandilo;K. Ganga;R. Gualtieri;J. Gudmundsson;M. Halpern;J. Hartley;M. Hasselfield;G. Hilton;W. Holmes;V. Hristov;Z. Huang;K. Irwin;W. Jones;A. Karakci;C. Kuo;Z. Kermish;J. S. Leung;S. Li;D. Mak;P. Mason;K. Megerian;L. Moncelsi;T. Morford;J. Nagy;C. Netterfield;M. Nolta;R. O’Brient;B. Osherson;I. Padilla;B. Racine;A. Rahlin;C. Reintsema;J. Ruhl;M. Runyan;T. M. Ruud;J. Shariff;E. C. Shaw;C. Shiu;J. Soler;X. Song;A. Trangsrud;C. Tucker;R. Tucker;A. Turner;J. V. D. List;A. Weber;I. Wehus;S. Wen;D. Wiebe;E. Young
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作者：
S. C. P. A. R. Ade;M. Amiri;S. Benton;A. Bergman;R. Bihary;J. Bock;J. Bond;J. A. Bonetti;S. Bryan;H. Chiang;C. Contaldi;O. Dor'e;A. Duivenvoorden;H. Eriksen;M. Farhang;J. Filippini;A. Fraisse;K. Freese;M. Galloway;A. Gambrel;N. Gandilo;K. Ganga;R. Gualtieri;J. Gudmundsson;M. Halpern;J. Hartley;M. Hasselfield;G. Hilton;W. Holmes;V. Hristov;Z. Huang;K. Irwin;W. Jones;A. Karakci;C. Kuo;Z. Kermish;J. S. Leung;S. Li;D. Mak;P. Mason;K. Megerian;L. Moncelsi;T. Morford;J. Nagy;C. Netterfield;M. Nolta;R. O’Brient;B. Osherson;I. Padilla;B. Racine;A. Rahlin;C. Reintsema;J. Ruhl;M. Runyan;T. M. Ruud;J. Shariff;E. C. Shaw;C. Shiu;J. Soler;X. Song;A. Trangsrud;C. Tucker;R. Tucker;A. Turner;J. V. D. List;A. Weber;I. Wehus;S. Wen;D. Wiebe;E. Young
我们提出了来自2015年蜘蛛长时间气球飞行的第一个线性偏振测量，这是一个旨在绘制宇宙微波背景（CMB）在角度尺度上的偏振的实验。这些测量的结果包括在95和150 GHz观测4.8%天空的地图和角功率谱，沿着对这些数据进行内部一致性测试的结果。虽然来自原始密度扰动的偏振CMB各向异性是该区域天空的主要信号，但也检测到了具有高度意义的银河尘埃发射。银河系同步辐射被发现是可以忽略不计的蜘蛛带。我们采用了两个独立的前景去除技术，探索宇宙学的结果，由每个假设的敏感性。主要的方法是使用来自普朗克数据的尘埃模板来减去银河尘埃信号。第二种方法，它构成了蜘蛛和普朗克数据在谐波域的联合分析，假设一个修改后的黑体模型的光谱能量分布的灰尘，其空间形态没有约束。使用对模板振幅和r参数空间进行联合采样的似然，我们从Feldman-Bayesian和Bayesian构造中推导出原始张量-标量比的95%上限，分别发现r < 0.11和r < 0.19。r中大约一半的不确定性来自与模板减法相关联的噪声。来自蜘蛛第二次飞行的280 GHz的新数据将补充普朗克偏振图，提供极化银河尘埃发射的强大测量。
We present the first linear polarization measurements from the 2015 long-duration balloon flight of Spider, which is an experiment that is designed to map the polarization of the cosmic microwave background (CMB) on degree angular scales. The results from these measurements include maps and angular power spectra from observations of 4.8% of the sky at 95 and 150 GHz, along with the results of internal consistency tests on these data. While the polarized CMB anisotropy from primordial density perturbations is the dominant signal in this region of sky, Galactic dust emission is also detected with high significance. Galactic synchrotron emission is found to be negligible in the Spider bands. We employ two independent foreground-removal techniques to explore the sensitivity of the cosmological result to the assumptions made by each. The primary method uses a dust template derived from Planck data to subtract the Galactic dust signal. A second approach, which constitutes a joint analysis of Spider and Planck data in the harmonic domain, assumes a modified-blackbody model for the spectral energy distribution of the dust with no constraint on its spatial morphology. Using a likelihood that jointly samples the template amplitude and r parameter space, we derive 95% upper limits on the primordial tensor-to-scalar ratio from Feldman–Cousins and Bayesian constructions, finding r < 0.11 and r < 0.19, respectively. Roughly half the uncertainty in r derives from noise associated with the template subtraction. New data at 280 GHz from Spider’s second flight will complement the Planck polarization maps, providing powerful measurements of the polarized Galactic dust emission.