High-latitude galactic dust emission in the BOOMERANG maps

We present millimeter-wave observations obtained by the BOOMERANG (Balloon Observations Of Millimetric Extragalactic Radiation ANd Geophysics) experim ent of Galactic emission at intermediate and high (b < -20<degrees>) Galact ic latitudes. We find that this emission is well correlated with extrapolat ed dust maps and is spectrally consistent with thermal emission from inters tellar dust (ISD). The ISD brightness in the 410 GHz map has an angular pow er spectrum c(l) similar to l(-beta) with 2 less than or similar to beta le ss than or similar to 3. At 150 GHz and at multipoles l similar to 200, the angular power spectrum of the IRAS- correlated dust signal is estimated to be l/(l + 1)c(l)/2 pi = 3.7 +/- 2.9 muK(2). This is negligible with respec t to the cosmic microwave background (CMB) signal measured by the same expe riment l(l + 1)c(l)/2 pi = 4700 +/- 540 muK(2). For the uncorrelated dust s ignal, we set an upper limit to the contribution to the CMB power at 150 GH z and of l similar to 200 l(l + l)c(l)/2 pi < 3 <mu>K-2 at 95% CL.