Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.215p..37e&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 215, NO.1/JUL01, P. 37P, 1985
Astronomy and Astrophysics
Astronomy
39
Scientific paper
The authors have measured line-strength gradients out to 80 arcsec from the centre of the elliptical galaxy NGC 5813. The line-strength measures include the Mg2 index and the equivalent widths of Hβ and two iron blends at 5270 and 5335 Å. The results show that Mg2 falls from 0.31 in the nucleus to ⪉0.1 in the outer parts of this galaxy and, for the first time, the authors have detected gradients in the iron features. In the halo of NGC 5813 the strengths of all the features considered here, including Hβ and the iron lines, match those of Galactic globular clusters at similar values of Mg2. The results suggest, with little ambiguity, that the metallicity in this galaxy falls from [Fe/H] > 0 in the centre, to [Fe/H] ˜ -0.7 in the outer parts.
Efstathiou George
Gorgas Javier
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