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- W4386044548 abstract "In this work, we report the first result from the investgation of Neutral atomic hydrogen(HI) 21cm absorption line in spectrum of PKS1413+135 as a associated type at redshift $zapprox 0.24670041$ observed by FAST using the observing time of 10 minutes for the absorber and the spectral resolution of the raw data was setted to 10 Hz. The full spectral profile is analysed by fitting the absorption line with single Gaussian function as the resolution of 10kHz in 2MHz bandwidth, eventually intending to illustrate the latest cosmic acceleration by the direct measurement of time evolution of the redshift of HI 21cm absorption line with Hubble flow toward a same background Quasar in the time interval of more than a decade or many years as a detectable signal that produced by the accelerated expansion of the Universe in the era of FAST at low redshift space,namely redshift drift $dot{z}$ or SL effect. The obtained HI gas column density $rm N_{HI} approx 2.2867times 10^{22}/cm^2$ of this DLA system, much equivalent to the originally observed value $rm N_{HI} approx 1.3times 10^{19}times(T_s/f)/cm^2$ within the uncertainties of the spin temperature of a spiral host galaxy, and the signal to noise ratio SNR highly reaching 57.4357 for the resolution of 10kHz evidently validates the opportunities of the HI 21cm absorption lines of DLA systems to enforce the awareness of the physical motivation of dark energy by the probe of $rmdot{z}$ with the enhancement of accuracy in the level of $sim 10^{-10}$ per decade." @default.
- W4386044548 created "2023-08-22" @default.
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- W4386044548 date "2023-08-17" @default.
- W4386044548 modified "2023-10-14" @default.
- W4386044548 title "Toward a direct measurement of the cosmic acceleration: The first observation of HI 21cm absorption line at FAST" @default.
- W4386044548 doi "https://doi.org/10.48550/arxiv.2308.08851" @default.
- W4386044548 hasPublicationYear "2023" @default.
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