Radial variation of attenuation and star formation in the largest late-type disks observed with Galex

S. Boissier, A. Gil De Paz, A. Boselli, B.F. F. Madore, V. Buat, Luca Cortese, D. Burgarella, J.C.M. C.M. Mateos, T.A. A. Barlow, K. Forster, P.G. G. Friedman, D. Christopher Martin, P. Morrissey, S.G. G. Neff, D. Schiminovich, M. Seibert, T. Small, T.K. K. Wyder, L. Bianchi, J. DonasT.M. M. Heckman, Y.W. W. Lee, B. Milliard, R. Michael Rich, A.S. S. Szalay, B.Y. Y. Welsh, S.K. K. Yi

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173 Citations (Scopus)

Abstract

For a sample of 43 nearby, late-type galaxies, we have investigated the radial variation of both the current star formation rate and the dust-induced UV light attenuation. To do this we have cross-correlated IRAS images and GALEX observations for each of these galaxies and compiled observations of the gas (CO and H I) and metal-abundance gradients found in the literature. We find that attenuation correlates with metallicity. We then use the UV profiles, corrected for attenuation, to study several variants of the Schmidt law and conclude that our results are compatible with a simple law similar to the one of Kennicutt extending smoothly to lower surface densities, but with considerable scatter. We do not detect an abrupt break in the UV light at the threshold radius derived from Ha data (at which the Ha profile shows a break and beyond which only a few H n regions are usually found). We interpret the Ha sudden break not as a change in the star formation regime (as often suggested), but as the vanishingly small number of ionizing stars corresponding to low levels of star formation. © 2007. The American Astronomical Society. All rights reserved.
Original languageEnglish
Pages (from-to)524-537
Number of pages14
JournalAstrophysical Journal, Supplement Series
Volume173
Issue number2
DOIs
Publication statusPublished - 2007

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