Large-scale modulation of star formation in void walls

CECCARELLI, L.; PADILLA, N.; LAMBAS, D.G.

Monthly Notices of the Royal Astronomical Society: Letters

Blackwell Publishing

Año: 2008 vol. 390 p. 9 - 13

1745-3933

We perform a statistical study of the characteristics of galaxies in voidsand void walls in the SDSS and 2dFGRS catalogues. We investigate dependencies of the distribution of galaxy spectral types and colours as a function position to void centres for different luminosity and local density ranges.  We find a trend towards bluer, star forming galaxies in void walls beyond the local density dependence. These results indicate that luminosity and local density do not entirely determine the distribution of galaxy properties such as colours and spectral types, andpoint towards a large scale modulation of star formation.  We argue  that this effect is due to the lower accretion rate and merger histories of galaxies that arriving at void walls from the emptier inner void regions.