Science with ALFALFA, etc.Science with ALFALFA, etc.

Riccardo GiovanelliRiccardo Giovanelli

May 2004

Credit: M. Steinmetz

Credit: Virgo collaboration (MPIfAp)

Here: place a Lyman alpha absorption spectrum in the l.o.s to3C273 (Weyman et al.)

xexxd

dnx 1*)10(ln

)(log)(

*/MMx HIwhere

Zwaan et al. 97: Zwaan et al. 97: Rosenberg & Schneider 02:Rosenberg & Schneider 02:370

* 0048.0 h 370

* 0041.0 h70

* log286.9/log hMM sun 70* log294.9/log hMM sun

20.1 53.1

[Mpc-3 dex-1]

HIMFHIMF

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

Survey Beam Area rms min MHI Ndet ts Nlos arcmin sq. deg. (@ 13 km/s) @ 1 Mpc sec

AHISS 3.3 13 0.8 1.0x105 66 var 6,000ADBS 3.3 430 3.5 4.2x105 265 12 140,000HIPASS 15. 30,000 14 1.9x106 ~5000 460 500,000HIJASS 12. (13,000) 14 1.9x106 (?) 3500 (380,000)J-Virgo 12 32 14 1.9x106 31 3500 900HIDEEP 15 32 3.2 4.4x105 173 9000 670

AO-DEEP 3.5 0.4 0.05 0.7x104 40? 252,000 105

ALFALFA 3.5 12,000 3.0 4.0x105 12,000? 12 106

VAVA 3.5 900 1.3 1.3x105 3,000? 12x5 300,000

ZOA 3.5 1000 0.5 0.7x105 8,000? 300 330,000

HI Mass FunctionHI Mass Functionin the local Universein the local Universe

Parkes HIPASS survey: Zwaan et al. 2003