EDP Sciences
Free access
Volume 392, Number 2, September III 2002
Page(s) 501 - 503
Section Galactic structure and dynamics
DOI http://dx.doi.org/10.1051/0004-6361:20021059

A&A 392, 501-503 (2002)
DOI: 10.1051/0004-6361:20021059

Research Note

The ISO Galactic metallicity gradient revisited

U. Giveon1, C. Morisset2 and A. Sternberg1

1  School of Physics and Astronomy and the Wise Observatory, The Beverly and Raymond Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
2  Institut d'Astrophysique de Marseille, CNRS & Univ. de Provence, BP 8, 13376 Marseille Cedex 12, France

(Received 7 May 2002 / Accepted 16 July 2002)

Two independent groups (Giveon et al. 2002; Martín-Hernández et al. 2002) have recently investigated the Galactic metallicty gradient as probed by ISO observations of mid-infrared emission-lines from HII regions. We show that the different gradients inferred by the two groups are due to differing source selection and differing extinction corrections. We show that both data sets in fact provide consistent results if identical assumptions are made in the analysis. We present a consistent set of gradients in which we account for extinction and variation in electron temperature across the Galactic disk.

Key words: Galaxy: abundances -- ISM: HII regions

Offprint request: A. Sternberg, amiel@wise.tau.ac.il

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