Extinction radial profiles of M83 from galex ultraviolet imaging

Samuel Boissier, Armando Gil De Paz, Barry F. Madore, Alessandro Boselli, Véronique Buat, Denis Burgarella, Peter G. Friedman, Tom A. Barlow, Luciana Bianchi, Yong Ik Byun, José Donas, Karl Forster, Timothy M. Heckman, Patrick N. Jelinsky, Young Wook Lee, Roger F. Malina, D. Christopher Martin, Bruno Milliard, Patrick Morrissey, Susan G. NeffR. Michael Rich, David Schiminovich, Oswarld H.W. Siegmund, Todd Small, Alex S. Szalay, Barry Y. Welsh, Ted K. Wyder

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


We use the far-UV (FUV) and near-UV images of M83 obtained by the Galaxy Evolution Explorer (GALEX) to compute the radial profile of the UV spectral slope in the star-forming disk. We briefly present a model of its chemical evolution, which allows us to obtain realistic intrinsic properties of the stellar populations. Using corollary data, we also compute the profiles of Hα/Hβ and total-IR/FUV ratios. Both the data and model are used to estimate and compare the extinction gradients at the FUV wavelength obtained from these various indicators. We discuss the implications for the determination of the star formation rate.

Original languageEnglish
Pages (from-to)L83-L86
JournalAstrophysical Journal
Issue number1 II
Publication statusPublished - 2005 Jan 20

Bibliographical note

Funding Information:
GALEX (Galaxy Evolution Explorer) is a NASA small explorer launched in 2003 April. We gratefully acknowledge NASA’s support for construction, operation, and science analysis for the GALEX mission, developed in cooperation with the Centre National d’Etudes Spatiales of France and the Korean Ministry of Science and Technology. We thank C. Popescu and R. Tuffs for their comments. S. B. thanks the CNES for its financial support.

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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