An improved source-subtracted and destriped 408-MHz all-sky mapCitation formats

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An improved source-subtracted and destriped 408-MHz all-sky map. / Remazeilles, M.; Dickinson, C.; Banday, A.J.; Bigot-Sazy, M.-A.; Ghosh, T.

In: Monthly Notices of the Royal Astronomical Society, Vol. 451, 2015, p. 4311-4327.

Research output: Contribution to journalArticlepeer-review

Harvard

Remazeilles, M, Dickinson, C, Banday, AJ, Bigot-Sazy, M-A & Ghosh, T 2015, 'An improved source-subtracted and destriped 408-MHz all-sky map', Monthly Notices of the Royal Astronomical Society, vol. 451, pp. 4311-4327. https://doi.org/10.1093/mnras/stv1274

APA

Remazeilles, M., Dickinson, C., Banday, A. J., Bigot-Sazy, M-A., & Ghosh, T. (2015). An improved source-subtracted and destriped 408-MHz all-sky map. Monthly Notices of the Royal Astronomical Society, 451, 4311-4327. https://doi.org/10.1093/mnras/stv1274

Vancouver

Remazeilles M, Dickinson C, Banday AJ, Bigot-Sazy M-A, Ghosh T. An improved source-subtracted and destriped 408-MHz all-sky map. Monthly Notices of the Royal Astronomical Society. 2015;451:4311-4327. https://doi.org/10.1093/mnras/stv1274

Author

Remazeilles, M. ; Dickinson, C. ; Banday, A.J. ; Bigot-Sazy, M.-A. ; Ghosh, T. / An improved source-subtracted and destriped 408-MHz all-sky map. In: Monthly Notices of the Royal Astronomical Society. 2015 ; Vol. 451. pp. 4311-4327.

Bibtex

@article{7a1be68718c445b098c2bb3c7045ab22,
title = "An improved source-subtracted and destriped 408-MHz all-sky map",
abstract = "The all-sky 408 MHz map of Haslam et al. is one the most important total-power radio surveys. It has been widely used to study diffuse synchrotron radiation from our Galaxy and as a template to remove foregrounds in cosmic microwave background data. However, there are a number of issues associated with it that must be dealt with, including large-scale striations and contamination from extragalactic radio sources. We have re-evaluated and reprocessed the rawest data available to produce a new and improved 408-MHz all-sky map. We first quantify the positional accuracy (‚{\^a}{\`a}7 arcmin) and effective beam (56.0 ¬± 1.0 arcmin) of the four individual surveys from which it was assembled. Large-scale striations associated with 1/f noise in the scan direction are reduced to a level ‚{\^a}{\texttrademark}1 K using a Fourier-based filtering technique. The most important improvement results from the removal of extragalactic sources. We have used an iterative combination of two techniques - two-dimensional Gaussian fitting and minimum curvature spline surface inpainting - to remove the brightest sources (‚{\^a}≥2 Jy), which provides a significant improvement over previous versions of the map. We quantify the impact with power spectra and a template fitting analysis of foregrounds to the WMAP data. The new map is publicly available and is recommended as the template of choice for large-scale diffuse Galactic synchrotron emission. We also provide a higher resolution map with small-scale fluctuations added, assuming a power-law angular power spectrum down to the pixel scale (1.7 arcmin). This should prove useful in simulations used for studying the feasibility of detecting H I fluctuations from the Epoch of Reionization.",
keywords = "methods: data analysis, techniques: image processing, diffuse radiation, radio continuum: general",
author = "M. Remazeilles and C. Dickinson and A.J. Banday and M.-A. Bigot-Sazy and T. Ghosh",
year = "2015",
doi = "10.1093/mnras/stv1274",
language = "English",
volume = "451",
pages = "4311--4327",
journal = "Royal Astronomical Society. Monthly Notices",
issn = "1365-2966",
publisher = "Oxford University Press",

}

RIS

TY - JOUR

T1 - An improved source-subtracted and destriped 408-MHz all-sky map

AU - Remazeilles, M.

AU - Dickinson, C.

AU - Banday, A.J.

AU - Bigot-Sazy, M.-A.

AU - Ghosh, T.

PY - 2015

Y1 - 2015

N2 - The all-sky 408 MHz map of Haslam et al. is one the most important total-power radio surveys. It has been widely used to study diffuse synchrotron radiation from our Galaxy and as a template to remove foregrounds in cosmic microwave background data. However, there are a number of issues associated with it that must be dealt with, including large-scale striations and contamination from extragalactic radio sources. We have re-evaluated and reprocessed the rawest data available to produce a new and improved 408-MHz all-sky map. We first quantify the positional accuracy (≈7 arcmin) and effective beam (56.0 ± 1.0 arcmin) of the four individual surveys from which it was assembled. Large-scale striations associated with 1/f noise in the scan direction are reduced to a level ≪1 K using a Fourier-based filtering technique. The most important improvement results from the removal of extragalactic sources. We have used an iterative combination of two techniques - two-dimensional Gaussian fitting and minimum curvature spline surface inpainting - to remove the brightest sources (≳2 Jy), which provides a significant improvement over previous versions of the map. We quantify the impact with power spectra and a template fitting analysis of foregrounds to the WMAP data. The new map is publicly available and is recommended as the template of choice for large-scale diffuse Galactic synchrotron emission. We also provide a higher resolution map with small-scale fluctuations added, assuming a power-law angular power spectrum down to the pixel scale (1.7 arcmin). This should prove useful in simulations used for studying the feasibility of detecting H I fluctuations from the Epoch of Reionization.

AB - The all-sky 408 MHz map of Haslam et al. is one the most important total-power radio surveys. It has been widely used to study diffuse synchrotron radiation from our Galaxy and as a template to remove foregrounds in cosmic microwave background data. However, there are a number of issues associated with it that must be dealt with, including large-scale striations and contamination from extragalactic radio sources. We have re-evaluated and reprocessed the rawest data available to produce a new and improved 408-MHz all-sky map. We first quantify the positional accuracy (≈7 arcmin) and effective beam (56.0 ± 1.0 arcmin) of the four individual surveys from which it was assembled. Large-scale striations associated with 1/f noise in the scan direction are reduced to a level ≪1 K using a Fourier-based filtering technique. The most important improvement results from the removal of extragalactic sources. We have used an iterative combination of two techniques - two-dimensional Gaussian fitting and minimum curvature spline surface inpainting - to remove the brightest sources (≳2 Jy), which provides a significant improvement over previous versions of the map. We quantify the impact with power spectra and a template fitting analysis of foregrounds to the WMAP data. The new map is publicly available and is recommended as the template of choice for large-scale diffuse Galactic synchrotron emission. We also provide a higher resolution map with small-scale fluctuations added, assuming a power-law angular power spectrum down to the pixel scale (1.7 arcmin). This should prove useful in simulations used for studying the feasibility of detecting H I fluctuations from the Epoch of Reionization.

KW - methods: data analysis

KW - techniques: image processing

KW - diffuse radiation

KW - radio continuum: general

UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84940116912&partnerID=MN8TOARS

U2 - 10.1093/mnras/stv1274

DO - 10.1093/mnras/stv1274

M3 - Article

VL - 451

SP - 4311

EP - 4327

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

SN - 1365-2966

ER -