Kavli Affiliate: Hu Zhan
| First 5 Authors: Haitao Miao, Yan Gong, Xuelei Chen, Zhiqi Huang, Xiao-Dong Li
| Summary:
The spectroscopic survey of the China Space Station Telescope (CSST) is
expected to obtain a huge number of slitless spectra, including more than one
hundred million galaxy spectra and millions of active galactic nuclei (AGN)
spectra. By making use of these spectra, we can measure the Baryon Acoustic
Oscillation (BAO) signals over large redshift ranges with excellent precisions.
In this work, we predict the CSST measurements of the post-reconstruction
galaxy power spectra at 0<z<1.2 and pre-reconstruction AGN power spectra at
0<z<4, and derive the BAO signals at different redshift bins by constraining
the BAO scaling parameters using the Markov Chain Monte Carlo method. Our
result shows that the CSST spectroscopic survey can provide accurate BAO
measurements with precisions higher than 1% and 3% for the galaxy and AGN
surveys, respectively. By comparing with current measurements in the same range
at low redshifts, this can improve the precisions by a factor of $2sim3$, and
similar precisions can be obtained in the pessimistic case. We also investigate
the constraints on the cosmological parameters using the measured BAO data by
the CSST, and obtain stringent constraint results for the energy density of
dark matter, Hubble constant, and equation of state of dark energy.
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