A map of diffuse radio emission at 182 MHz to enhance epoch of reionization observations in the Southern hemisphere

被引：17

作者：

Byrne, Ruby ^{[1
,2
]}

Morales, Miguel F. ^{[2
]}

Hazelton, Bryna ^{[2
,3
]}

Sullivan, Ian ^{[4
]}

Barry, Nichole ^{[5
,6
]}

Lynch, Christene ^{[6
,7
]}

Line, Jack L. B. ^{[6
,7
]}

Jacobs, Daniel C. ^{[8
]}

机构：

[1] CALTECH, Astron Dept, 1200 E Calif Blvd, Pasadena, CA 91125 USA

[2] Univ Washington, Phys Dept, 3910 15th Ave NE, Seattle, WA 98195 USA

[3] Univ Washington, eSci Inst, 3910 15th Ave NE, Seattle, WA 98195 USA

[4] Univ Washington, Astron Dept, 3910 15th Ave NE, Seattle, WA 98195 USA

[5] Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia

[6] Australian Res Council Ctr Excellence All Sky Ast, Canberra, ACT, Australia

[7] Curtin Univ, Int Ctr Radio Astron Res, 1 Turner Ave, Bentley, WA 6102, Australia

[8] Arizona State Univ, Sch Earth & Space Explorat, POB 876004, Tempe, AZ 85287 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2022年 / 510卷 / 02期

基金：

美国国家科学基金会; 澳大利亚研究理事会;

关键词：

(cosmology:) dark ages; reionization; first stars; polarization; techniques: interferometric; techniques: polarimetric; 21 CM COSMOLOGY; POLARIZATION LEAKAGE; INTERFEROMETRIC DATA; SELF-CALIBRATION; POWER-SPECTRA; SKY SURVEY; POLARIMETRY; DECONVOLUTION; SIMULATIONS; FRAMEWORK;

D O I：

10.1093/mnras/stab3276

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a broad-band map of polarized diffuse emission at 167-198 MHz developed from data from the Murchison Widefield Array (MWA). The map is designed to improve visibility simulation and precision calibration for 21 cm Epoch of Reionization (EoR) experiments. It covers a large swath - 11 000 sq. deg. - of the Southern hemisphere sky in all four Stokes parameters and captures emission on angular scales of 1-9 degrees. The band-averaged diffuse structure is pre-dominantly unpolarized but has significant linearly polarized structure near RA = 0 h. We evaluate the accuracy of the map by combining it with the GLEAM catalogue and simulating an observation from the MWA, demonstrating that the accuracy of the short baselines (6.1-50 wavelengths) now approaches the accuracy of the longer baselines typically used for EoR calibration. We discuss how to use the map for visibility simulation for a variety of interferometric arrays. The map has potential to improve calibration accuracy for experiments such as the Hydrogen Epoch of Reionization Array and the forthcoming Square Kilometre Array as well as the MWA.

引用

页码：2011 / 2024

页数：14

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