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The Hα approach<br />
Samples of Hα-selected star-forming galaxies<br />
Hα as an excellent CURRENT SFR tracer, AGN sensible<br />
Same rest-frame selection criteria<br />
Narrow-band Total line fluxes. No aperture corrections<br />
Line selected <br />
‣ Well defined volume<br />
‣ Complete and representative samples<br />
‣ Wide coverage in the parameters space<br />
Known fields<br />
Multi-wavelength complementary data<br />
t<br />
m<br />
2<br />
σ( Hα)<br />
L( Hα) = hνHα<br />
φ( m) ψ( t) dmdt N<br />
Lyman( m)<br />
σ ∫∫<br />
B<br />
t−tm m<br />
1<br />
SFR Hα<br />
(M <br />
yr -1 ) = L Hα<br />
/ 1.27 x 10 34 W (Kennicutt 1998)
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