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Title

5 major upgrades since 1991:

1: The ground screen 2: The Gregorian upgrade 3: Road 22 completed 4: Harris computers in the trash

5: ALFA
G. Gavazzi Universita' di Milano ­ Bicocca


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


SED


http://goldmine.mib.infn.it.
GOLDmine

it


HI normal

HI deficient

Young stars
b = present / past SFR LH / LH

Gavazzi et al. 2002


The total available gas regulates the global star formation

HI def


R+HI

H

NON deficient galaxy

Non def
H extent = disk


R+HI

H

deficient galaxy

truncated H Emission

def


Radii

HI

H

CO


Virgo follow-up
ALFA: HI survey (2005) GALEX: UV survey (this year) AstroF: FIR survey (2005) Two complete samples: E+dE horizontal WFS strip at INT 127 galaxies (m<18) B imaging S+Irr ISO sample 118 galaxies (m<18)


E+dE: horizontal WFS strip

VLT: velocity dispersion NIR imaging XMM: 10 fields

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



H

R

HI

VCC 1987

vcc1987


VIRGO HI

Cayatte
VCC 1615 VCC 307

VCC 1987 VCC1727

0.75 Mpc 1.5 Mpc Cayatte et al. (1990)


title

The Virgo cluster

G. Gavazzi Universita' di Milano ­ Bicocca


HI

Virgo