1. Science with ALFALFA, etc. Riccardo Giovanelli May 2004

3. Credit: M. Steinmetz

4. Credit: Virgo collaboration (MPIfAp)

5. Here: place a Lyman alpha absorption spectrum in the l.o.s to 3C273 (Weyman et al.)

6. where Zwaan et al. 97: Rosenberg & Schneider 02: [Mpc -3 dex -1 ] HIMF

7. Science Topics to be addressed byALFALFA: 1 The investigation of the HI Mass Function 2 High Mass HI sources 3 Environmental variations of the HI properties of galaxies 4 The low HI Column density environment of galaxies 5 Environmental differences in the HI Mass function 6 HI absorbers and the link to Lyman  absorbers 7 OH Megamasers at intermediate redshift

8. Survey Beam Area rms min M HI N det t s N los arcmin sq. deg. (@ 13 km/s) @ 1 Mpc sec AHISS 3.3 13 0.8 1.0x10 5 66 var 6,000 ADBS 3.3 430 3.5 4.2x10 5 265 12 140,000 HIPASS 15. 30,000 14 1.9x10 6 ~5000 460 500,000 HIJASS 12. (13,000) 14 1.9x10 6 (?) 3500 (380,000) J-Virgo 12 32 14 1.9x10 6 31 3500 900 HIDEEP 15 32 3.2 4.4x10 5 173 9000 670 AO-DEEP 3.5 0.4 0.05 0.7x10 4 40? 252,000 105 ALFALFA 3.5 12,000 3.0 4.0x10 5 12,000? 12 10 6 VAVA 3.5 900 1.3 1.3x10 5 3,000? 12x5 300,000 ZOA 3.5 1000 0.5 0.7x10 5 8,000? 300 330,000

10. HI Mass Function in the local Universe Parkes HIPASS survey: Zwaan et al. 2003