Science with ALFALFA, etc. Riccardo Giovanelli May 2004.

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Presentation transcript:

Science with ALFALFA, etc. Riccardo Giovanelli May 2004

Credit: M. Steinmetz

Credit: Virgo collaboration (MPIfAp)

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

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

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 M HI N det t s N los arcmin sq. deg Mpc sec AHISS x var 6,000 ADBS x ,000 HIPASS , x10 6 ~ ,000 HIJASS 12. (13,000) x10 6 (?) 3500 (380,000) J-Virgo x HIDEEP x AO-DEEP x ? 252, ALFALFA , x ,000? VAVA x10 5 3,000? 12x5 300,000 ZOA x10 5 8,000? ,000

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