Chuan-Peng Zhang

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I am Chuan-Peng Zhang, an astronomer working at the National Astronomical Observatories, Chinese Academy of Sciences (NAOC) as an associate professor now, and was ever at the Max-Planck-Institut für Astronomie (MPIA) as a postdoc.

About me

Current Work

The FAST All Sky H I Survey (FASHI) conducted with the Five-hundred-meter Aperture Spherical radio Telescope (FAST) has mapped ∼19 500 deg² of the sky north of DEC = −14°, detecting 156 411 extragalactic H I sources at z < 0.09 with a median sensitivity of 0.57 mJy beam⁻¹ at a velocity resolution of 6.4 km s⁻¹. The survey achieves unprecedented depth and area coverage, significantly improving upon previous single-dish surveys. Through a detailed completeness analysis that accounts for the survey's non-uniform sensitivity and line-width dependence, we construct a robust H I mass function (HIMF) using a completeness‑corrected sample of over 109 000 sources. The HIMF is robustly constrained down to M_HI ∼ 10^6.2 M_⊙. When systematic uncertainties are included, the HIMF is well described by a single-Schechter function with a characteristic mass log(M_s/h₇₀⁻² M_⊙) = 9.89 ± 0.02, low-mass end slope α = −1.31±0.02 and amplitude φ_s = (6.38±0.49)×10⁻³h₇₀³ Mpc⁻³ dex⁻¹. The derived cosmic H I density is Ω_HI = (4.71 ± 0.03_stat±0.40_sys) × 10⁻⁴ h₇₀⁻¹. FASHI provides the most extensive and sensitive H I catalog to date, establishing an important benchmark for studies of gas accretion, galaxy evolution, and large-scale structure in the local universe.

Astro links