Recovery of 21 cm intensity maps with sparse component separation - INSPIRE

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Recovery of 21 cm intensity maps with sparse component separation

Jun 10, 2020

16 pages

Published in:

Mon.Not.Roy.Astron.Soc. 499 (2020) 1, 304-319

Published: Oct 22, 2020

e-Print:

2006.05996 [astro-ph.CO]

DOI:

10.1093/mnras/staa2854 (publication)

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Abstract: (Oxford University Press)

21-cm intensity mapping has emerged as a promising technique to map the large-scale structure of the Universe. However, the presence of foregrounds with amplitudes orders of magnitude larger than the cosmological signal constitutes a critical challenge. Here, we test the sparsity-based algorithm generalized morphological component analysis (GMCA) as a blind component separation technique for this class of experiments. We test the GMCA performance against realistic full-sky mock temperature maps that include, besides astrophysical foregrounds, also a fraction of the polarized part of the signal leaked into the unpolarized one, a very troublesome foreground to subtract, usually referred to as polarization leakage. To our knowledge, this is the first time the removal of such component is performed with no prior assumption. We assess the success of the cleaning by comparing the true and recovered power spectra, in the angular and radial directions. In the best scenario looked at, GMCA is able to recover the input angular (radial) power spectrum with an average bias of |

{\sim} 5{{\ \rm per\ cent}}

| for ℓ > 25 (⁠|

20\!-\!30 {{\ \rm per\ cent}}

| for |

k_{\parallel } \gtrsim 0.02 \, h^{-1}

| Mpc), in the presence of polarization leakage. Our results are robust also when up to |

40{{\ \rm per\ cent}}

| of channels are missing, mimicking a radio-frequency interference (RFI) flagging of the data. Having quantified the notable effect of polarization leakage on our results, in perspective we advocate the use of more realistic simulations when testing 21-cm intensity mapping capabilities.

Note:

16 pages and 17 figures. This manuscript matches the published paper. Code and demonstrative notebooks are available at https://github.com/isab3lla/gmca4im and data-set to reproduce our results is available at https://doi.org/10.5281/zenodo.3991818

methods: data analysis
methods: statistical
large-scale structure of Universe
cosmology: observations
radio lines: galaxies
radio lines: ISM

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