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The lenticular galaxy NGC 3607: stellar population, metallicity,and ionised gas

机译：The lenticular galaxy NGC 3607: stellar population, metallicity,and ionised gas

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Aims. In this work we derive clues to the formation scenario and ionisation source of the lenticular galaxy NGC 3607 by means ofmetallicity gradients, stellar population, and emission lines properties.Methods. We work with long-slit spectroscopy from which we (i) study the radial distribution of the equivalent widths of conspicuousmetallic absorption features; (ii) make inferences about the star formation history (with a stellar population synthesis algorithm); and(iii) investigate the ionisation source responsible for a few strong emission lines.Results. Negative radial gradients are observed for most of the absorption features of NGC 3607. Compared to the external parts,the central region has a deficiency of alpha elements and higher metallicity, which implies different star formation histories in bothregions. At least three star formation episodes are detected, with ages within 1-13 Gyr. The dynamical mass and the Mg2 gradientslope are consistent with mergers being important contributors to the formation mechanism of NGC 3607, a scenario consistent withthe star formation episodes.. Emission-line ratios indicate a LINER at the centre of NGC 3607. Contribution of hot, old stars to thegas ionisation outside the central region is detected.

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