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Date and Time of the Query: 2019-07-22 T22:24:12 PDT
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For refcode 2010ApJ...723.1359M:
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Copyright by American Astronomical Society. Reproduced by permission
2010ApJ...723.1359M The Arecibo Legacy Fast ALFA Survey. X. The H I Mass Function and {OMEGA}_HI_ from the 40% ALFALFA Survey Martin, Ann M.; Papastergis, Emmanouil; Giovanelli, Riccardo; Haynes, Martha P.; Springob, Christopher M.; Stierwalt, Sabrina Abstract. The Arecibo Legacy Fast ALFA (ALFALFA) survey has completed source extraction for 40% of its total sky area, resulting in the largest sample of H I-selected galaxies to date. We measure the H I mass function from a sample of 10,119 galaxies with 6.2 < log (M_HI_/M_{sun}_) < 11.0 and with well-described mass errors that accurately reflect our knowledge of low-mass systems. We characterize the survey sensitivity and its dependence on profile velocity width, the effect of large-scale structure, and the impact of radio frequency interference in order to calculate the H I mass function with both the 1/V_max_ and 2DSWML methods. We also assess a flux-limited sample to test the robustness of the methods applied to the full sample. These measurements are in excellent agreement with one another; the derived Schechter function parameters are {phi}_*_ (h ^3^_70_ Mpc^--3^ dex^--1^) = 4.8 +/- 0.3 x 10^--3^, log (M_*_/M_sun_) + 2 log h_70_ = 9.96 +/- 0.02, and {alpha} = --1.33 +/- 0.02. We find {OMEGA}_HI_ = 4.3 +/- 0.3 x10^--4^ h ^--1^_70_, 16% larger than the 2005 HIPASS result, and our Schechter function fit extrapolated to log (M_HI_/M_{sun}_) = 11.0 predicts an order of magnitude more galaxies than HIPASS. The larger values of {OMEGA}_HI_ and of M* imply an upward adjustment for estimates of the detection rate of future large-scale H I line surveys with, e.g., the Square Kilometer Array. A comparison with simulated galaxies from the Millennium Run and a treatment of photoheating as a method of baryon removal from H I-selected halos indicate that the disagreement between dark matter mass functions and baryonic mass functions may soon be resolved. Key words: galaxies: distances and redshifts, galaxies: dwarf, galaxies: luminosity function, mass function, radio lines: galaxies, surveys
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