A new polarization amplitude bias reduction method
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In this article, a known-angle estimator was proposed to correct the positive noise bias in the case of additional information about the polarisation angle, where the uncertainties in the Q,U Stokes parameters are not symmetric.Abstract:
Polarisation amplitude estimation is affected by a positive noise bias, particularly important in regions with low signal-to-noise ratio (SNR). We present a new approach to correct for this bias in the case there is additional information about the polarisation angle. We develop the 'known-angle estimator' that works in the special case when there is an independent and high signal-to-noise ratio ($\gtrsim 2\sigma$) measurement of the polarisation angle. It is derived for the general case where the uncertainties in the Q,U Stokes parameters are not symmetric. This estimator completely corrects for the polarisation bias if the polarisation angle is perfectly known. In the realistic case, where the angle template has uncertainties, a small residual bias remains, but that is shown to be much smaller that the one left by other classical estimators. We also test our method with more realistic data, using the noise properties of the three lower frequency maps of WMAP. In this case, the known-angle estimator also produces better results than methods that do not include the angle information. This estimator is therefore useful in the case where the polarisation angle is expected to be constant over different data sets with different SNR.read more
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Journal ArticleDOI
JCMT BISTRO Survey Observations of the Ophiuchus Molecular Cloud: Dust Grain Alignment Properties Inferred Using a Ricean Noise Model
Kate Pattle,Kate Pattle,Shih-Ping Lai,Shih-Ping Lai,Tetsuo Hasegawa,Jia-Wei Wang,Ray S. Furuya,Derek Ward-Thompson,Pierre Bastien,Simon Coudé,Chakali Eswaraiah,Lapo Fanciullo,James Di Francesco,Thiem Hoang,Thiem Hoang,Gwanjeong Kim,Woojin Kwon,Woojin Kwon,Chang Won Lee,Chang Won Lee,Sheng-Yuan Liu,Tie Liu,Masafumi Matsumura,Takashi Onaka,Takashi Onaka,Sarah Sadavoy,Archana Soam +26 more
TL;DR: In this paper, the dependence of the polarization fraction p on total intensity I in polarized submillimeter emission measurements is typically parameterized as p ∝ I −α (α ≤ 1), with an index α = 1 indicating near-total lack of alignment of grains with the magnetic field.
Journal ArticleDOI
Polarization measurements analysis II. Best estimators of polarization fraction and angle
L. A. Montier,L. A. Montier,Stéphane Plaszczynski,François Levrier,Matthieu Tristram,D. Alina,D. Alina,I. Ristorcelli,I. Ristorcelli,J.-P. Bernard,J.-P. Bernard,Vincent Guillet +11 more
TL;DR: In this article, the authors compare the performance of the traditional frequentist estimators of the polarization fraction and angle with two recent estimators: one inspired by a Bayesian analysis and a second following an asymptotic method, and evaluate the statistical bias on the angle that appears when the covariance matrix exhibits effective ellipticity.
Journal ArticleDOI
The JCMT BISTRO survey: the magnetic field of the Barnard 1 star-forming region
Simon Coudé,Pierre Bastien,Martin Houde,Sarah Sadavoy,Rachel Friesen,James Di Francesco,Doug Johnstone,Steve Mairs,Tetsuo Hasegawa,Woojin Kwon,Woojin Kwon,Shih-Ping Lai,Shih-Ping Lai,Keping Qiu,Derek Ward-Thompson,David Berry,Michael Chun-Yuan Chen,Jason Fiege,Erica Franzmann,Jennifer Hatchell,Kevin Lacaille,Kevin Lacaille,Brenda C. Matthews,Gerald H. Moriarty-Schieven,Andy Pon,Philippe André,Doris Arzoumanian,Yusuke Aso,Do-Young Byun,Do-Young Byun,Chakali Eswaraiah,Huei-Ru Chen,Huei-Ru Chen,Wen Ping Chen,Tao-Chung Ching,Tao-Chung Ching,Jungyeon Cho,Minho Choi,Antonio Chrysostomou,Eun Jung Chung,Yasuo Doi,Emily Drabek-Maunder,C. Darren Dowell,S. P. S. Eyres,Sam Falle,Per Friberg,Gary A. Fuller,Ray S. Furuya,Tim Gledhill,Sarah Graves,Jane Greaves,Matthew Joseph Griffin,Qilao Gu,Saeko S. Hayashi,Thiem Hoang,Wayne S. Holland,Tsuyoshi Inoue,Shu-ichiro Inutsuka,Kazunari Iwasaki,Il-Gyo Jeong,Yoshihiro Kanamori,Akimasa Kataoka,Ji-hyun Kang,Miju Kang,Sung-ju Kang,Koji S. Kawabata,Francisca Kemper,Gwanjeong Kim,Gwanjeong Kim,Gwanjeong Kim,Jongsoo Kim,Jongsoo Kim,Kee-Tae Kim,Kyoung Hee Kim,Mi-Ryang Kim,Shinyoung Kim,Shinyoung Kim,Jason M. Kirk,Masato I. N. Kobayashi,Patrick M. Koch,Jungmi Kwon,Jeong-Eun Lee,Chang Won Lee,Chang Won Lee,Sang-Sung Lee,Sang-Sung Lee,Dalei Li,Di Li,Hua-bai Li,Hong-Li Liu,Junhao Liu,Sheng-Yuan Liu,Tie Liu,Sven Van Loo,A-Ran Lyo,Masafumi Matsumura,Tetsuya Nagata,Fumitaka Nakamura,Hiroyuki Nakanishi,Nagayoshi Ohashi,Takashi Onaka,Harriet Parsons,Kate Pattle,Nicolas Peretto,Tae-Soo Pyo,Tae-Soo Pyo,Lei Qian,Ramprasad Rao,Mark G. Rawlings,Brendan Retter,J. S. Richer,Andrew Rigby,Jean-François Robitaille,Hiro Saito,Giorgio Savini,Anna M. M. Scaife,Masumichi Seta,H. Shinnaga,Archana Soam,Archana Soam,Motohide Tamura,Ya-Wen Tang,Kohji Tomisaka,Yusuke Tsukamoto,Hongchi Wang,Jia-Wei Wang,Anthony Peter Whitworth,Hsi-Wei Yen,Hsi-Wei Yen,Hyunju Yoo,Jinghua Yuan,Tetsuya Zenko,Chuan-Peng Zhang,Guoyin Zhang,Jianjun Zhou,Lei Zhu +135 more
TL;DR: In this article, the authors present the POL-2 850 μm linear polarization map of the Barnard 1 clump in the Perseus molecular cloud complex from the B-fields In STar-forming Region Observations survey at the James Clerk Maxwell Telescope.
Journal ArticleDOI
Statistics of the fractional polarization of compact radio sources in Planck maps
TL;DR: In this paper, the authors applied the stacking technique to estimate the average fractional polarisation from 30 to 353 GHz of a primary sample of 1560 compact sources - essentially all radio sources - detected in the 30 GHz Planck all-sky map and listed in the second version of the Planck Catalogue of Compact Sources (PCCS2).
Journal ArticleDOI
Fractional polarization of extragalactic sources in the 500 deg2 SPTpol survey
Nikhel Gupta,Christian L. Reichardt,Peter A. R. Ade,Adam Anderson,M. Archipley,Jason E. Austermann,Jessica Avva,J. A. Beall,Andreas Bender,Bradford Benson,Bradford Benson,Federico Bianchini,Lindsey Bleem,John E. Carlstrom,John E. Carlstrom,Chihway Chang,Chihway Chang,H. C. Chiang,Robert I. Citron,C. Corbett Moran,T. M. Crawford,A. T. Crites,A. T. Crites,T. de Haan,T. de Haan,M. A. Dobbs,M. A. Dobbs,W. B. Everett,Chang Feng,Jason Gallicchio,Elizabeth George,Elizabeth George,A. J. Gilbert,N. W. Halverson,N. L. Harrington,Jason W. Henning,Gene C. Hilton,G. P. Holder,G. P. Holder,W. L. Holzapfel,Zhen Hou,J. D. Hrubes,N. Huang,Johannes Hubmayr,Kent D. Irwin,Lloyd Knox,Adrian T. Lee,Adrian T. Lee,Dale Li,Dale Li,A. E. Lowitz,D. Luong-Van,Daniel P. Marrone,Jeff McMahon,S. S. Meyer,L. M. Mocanu,Joseph J. Mohr,Joseph J. Mohr,Joshua Montgomery,Andrew Nadolski,T. Natoli,T. Natoli,John P. Nibarger,G. I. Noble,V. Novosad,S. Padin,S. Padin,S. Patil,C. Pryke,J. E. Ruhl,Benjamin Saliwanchik,J. T. Sayre,K. K. Schaffer,K. K. Schaffer,Erik Shirokoff,Erik Shirokoff,C. Sievers,Graeme Smecher,Z. K. Staniszewski,Z. K. Staniszewski,A. A. Stark,K. T. Story,Eric R. Switzer,Carole Tucker,K. Vanderlinde,T. Veach,Joaquin Vieira,Gensheng Wang,Nathan Whitehorn,R. Williamson,R. Williamson,W. L. K. Wu,V. G. Yefremenko,L. Zhang +93 more
TL;DR: Gupta et al. as mentioned in this paper studied the polarization properties of extragalactic sources at 95 and 150 GHz in the SPTpol 500 deg2 survey and found that the polarization fraction depends on the source flux or observing frequency.
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TL;DR: The European Space Agency's Planck satellite, dedicated to studying the early Universe and its subsequent evolution, was launched 14 May 2009 and has been scanning the microwave and submillimetre sky continuously since 12 August 2009 as discussed by the authors.
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