Title

G. Gavazzi

Universita’ di Milano – Bicocca

5 major upgrades since 1991:

2: The Gregorian upgrade

1: The ground screen

3: Road 22 completed

4: Harris computers in the trash

5: ALFA

ALFA full coverage of the Virgo cluster

(800 deg2)

• Detections or 1 mJy limits on 2000 VCC galaxies

• Tully-Fisher distances• Search for intergalactic HI clouds

S E D

GOLDmine

http

://go

ldm

ine.

mib

.infn

.it.it

Young starsHI deficientHI normal

Gavazzi et al. 2002

b = present / past SFR LH / LH

The total available gas regulates the global star formation

HI def

H extent = disk

NON deficient galaxy

Non def

R+HI H

deficient galaxy

truncated H Emission

def

R+HI H

Radii

HI H CO

Virgo follow-upALFA: HI survey (2005)GALEX: UV survey (this year)AstroF: FIR survey (2005)

Two complete samples:

E+dEhorizontal WFS strip at INT127 galaxies (m<18)B imaging

S+IrrISO sample 118 galaxies (m<18)

VLT: velocity dispersionNIR imagingXMM: 10 fields

E+dE: horizontal WFS strip

ISO sample

• Sub-mm• H imaging• HI Arecibo• Visible imag.(Megacam?)• Optical spectr.

VCC 1987

H R

HI

vcc1987

CayatteVIRGO HI

Cayatte et al. (1990)

VCC1727

VCC 1615 VCC 307

VCC 1987

0.75 Mpc

1.5 Mpc

title

G. Gavazzi

Universita’ di Milano – Bicocca

The Virgo cluster

HI Virgo