MITEoR: a scalable interferometer for precision 21 cm cosmology

被引：76

作者：

Zheng, H. ^{[1
,2
]}

Tegmark, M. ^{[1
,2
]}

Buza, V. ^{[1
,2
,3
]}

Dillon, J. S. ^{[1
,2
]}

Gharibyan, H. ^{[1
,2
]}

Hickish, J. ^{[4
]}

Kunz, E. ^{[1
,2
]}

Liu, A. ^{[1
,2
,5
,6
,7
]}

Losh, J. ^{[1
,2
]}

Lutomirski, A. ^{[1
,2
]}

Morrison, S. ^{[1
,2
]}

Narayanan, S. ^{[1
,2
]}

Perko, A. ^{[1
,2
,8
]}

Rosner, D. ^{[1
,2
]}

Sanchez, N. ^{[1
,2
]}

Schutz, K. ^{[1
,2
]}

Tribiano, S. M. ^{[1
,2
,9
]}

Valdez, M. ^{[1
,2
,10
]}

Yang, H. ^{[1
,2
]}

Adami, K. Zarb ^{[4
]}

Zelko, I. ^{[1
,2
]}

Zheng, K. ^{[1
,2
]}

Armstrong, R. P. ^{[1
,2
,11
]}

Bradley, R. F. ^{[12
,13
]}

Dexter, M. R. ^{[5
,6
]}

Ewall-Wice, A. ^{[1
,2
]}

Magro, A. ^{[14
]}

Matejek, M. ^{[1
,2
]}

Morgan, E. ^{[1
,2
]}

Neben, A. R. ^{[1
,2
]}

Pan, Q. ^{[1
,2
]}

Penna, R. F. ^{[1
,2
]}

Peterson, C. M. ^{[3
]}

Su, M. ^{[1
,2
]}

Villasenor, J. ^{[1
,2
]}

Williams, C. L. ^{[1
,2
]}

Zhu, Y. ^{[1
,2
,8
]}

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

[2] MIT, Kavli Inst, Cambridge, MA 02139 USA

[3] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[4] Univ Oxford, Dept Phys, Oxford OX1 3RH, England

[5] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[6] Univ Calif Berkeley, Radio Astron Lab, Berkeley, CA 94720 USA

[7] Berkeley Ctr Cosmol Phys, Berkeley, CA 94720 USA

[8] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[9] CUNY, Dept Sci, Borough Manhattan Community Coll, New York, NY 10007 USA

[10] Boston Univ, Dept Astron, Boston, MA 02215 USA

[11] Univ Cape Town, Dept Astron, ZA-7701 Rondebosch, South Africa

[12] Univ Virginia, Dept Elect & Comp Engn, Charlottesville, VA 22904 USA

[13] Natl Radio Astron Observ, Charlottesville, VA 22903 USA

[14] Univ Malta, Dept Phys, MSD-2080 Msida, Malta

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2014年 / 445卷 / 02期

基金：

美国国家科学基金会;

关键词：

instrumentation: interferometers; methods: data analysis; techniques: interferometric; cosmology: observations; dark ages; reionization; first stars; POWER SPECTRUM; REIONIZATION; EPOCH; CALIBRATION; ARRAY; OBSERVATORIES; SENSITIVITY; DESIGN; LIMIT;

D O I：

10.1093/mnras/stu1773

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on the MIT Epoch of Reionization (MITEoR) experiment, a pathfinder low-frequency radio interferometer whose goal is to test technologies that improve the calibration precision and reduce the cost of the high-sensitivity 3D mapping required for 21 cm cosmology. MITEoR accomplishes this by using massive baseline redundancy, which enables both automated precision calibration and correlator cost reduction. We demonstrate and quantify the power and robustness of redundancy for scalability and precision. We find that the calibration parameters precisely describe the effect of the instrument upon our measurements, allowing us to form a model that is consistent with chi(2) per degree of freedom < 1.2 for as much as 80 per cent of the observations. We use these results to develop an optimal estimator of calibration parameters using Wiener filtering, and explore the question of how often and how finely in frequency visibilities must be reliably measured to solve for calibration coefficients. The success of MITEoR with its 64 dual-polarization elements bodes well for the more ambitious Hydrogen Epoch of Reionization Array project and other next-generation instruments, which would incorporate many identical or similar technologies.

引用

页码：1084 / 1103

页数：20

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