Kavli Affiliate: Jing Wang
| First 5 Authors: Wenlin Ma, Hong Guo, Haojie Xu, Michael G. Jones, Chuan-Peng Zhang
| Summary:
We present the first HI mass function (HIMF) measurement for the recent FAST
All Sky HI (FASHI) survey and the most complete measurements of HIMF in the
local universe so far by combining the HI catalogues from HI Parkes All Sky
Survey (HIPASS), Arecibo Legacy Fast ALFA (ALFALFA) and FASHI surveys at
redshift 0 < z < 0.05, covering 76% of the entire sky. We adopt the same
methods to estimate distances, calculate sample completeness, and determine the
HIMF for all three surveys. The best-fitting Schechter function for the total
HIMF has a low-mass slope parameter alpha = -1.30 and a knee mass log(Ms) =
9.86 and a normalization phi_s = 0.00658. This gives the cosmic HI abundance
omega_HI= 0.000454. We find that a double Schechter function with the same
slope alpha better describes our HIMF, and the two different knee masses are
log(Ms1) = 9.96 and log(Ms2) = 9.65. We verify that the measured HIMF is
marginally affected by the choice of distance estimates. The effect of cosmic
variance is significantly suppressed by combining the three surveys and it
provides a unique opportunity to obtain an unbiased estimate of the HIMF in the
local universe.
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