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- W2466308755 abstract "Understanding properties of the first sources in the Universe using the redshifted HI ~21-cm signal is one of the major aims of present and upcoming low-frequency experiments. We investigate the possibility of imaging the redshifted 21-cm pattern around the first sources during the cosmic dawn using the SKA1-low. We model the HI ~21-cm image maps, appropriate for the SKA1-low, around the first sources consisting of stars and X-ray sources within galaxies. In addition to the system noise, we account also for the astrophysical foregrounds by adding them to the signal maps. We find that after subtracting the foregrounds using a polynomial fit and suppressing the noise by smoothing the maps over $10^{'} - 30^{'}$ angular scale, the isolated sources at $z sim 15$ are detectable with $sim 4 - 9 , sigma$ confidence level in 2000 h of observation with the SKA1-low. Although the 21-cm profiles around the sources get altered because of the Gaussian smoothing, the images can still be used to extract some of the source properties. We account for overlaps in the patterns of the individual sources by generating realistic HI ~21-cm maps of the cosmic dawn that are based on $N$-body simulations and a one-dimensional radiative transfer code. We find that these sources should be detectable in the SKA1-low images at $z = 15$ with an SNR of $sim 14 (4)$ in 2000 (200) h of observations. One possible observational strategy thus could be to observe multiple fields for shorter observation times, identify fields with SNR $gtrsim 3$ and observe these fields for much longer duration. Such observations are expected to be useful in constraining the parameters related to the first sources." @default.
- W2466308755 created "2016-07-22" @default.
- W2466308755 creator A5025154308 @default.
- W2466308755 creator A5041411426 @default.
- W2466308755 creator A5054131139 @default.
- W2466308755 creator A5081802238 @default.
- W2466308755 date "2016-09-30" @default.
- W2466308755 modified "2023-10-16" @default.
- W2466308755 title "Imaging the redshifted 21 cm pattern around the first sources during the cosmic dawn using the SKA" @default.
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