Population synthesis for the spectrum of NGC5018

Details Population synthesis for the spectrum of NGC5018 Population synthesis for the spectrum of NGC5018

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002acasn..43..264k&link_type=abstract

Acta Astronomica Sinica, vol.43, no.3, p. 264-271

Other

Galaxies: Elliptical, Galaxies: Individual: Ngc5018, Galaxies: Star Cluster, Methods: Numerical, Line: Profiles

Scientific paper

The long-slit spectral observations of NGC5018 in the range ? 3600 - 7500 Å with the BAO 2.16m telescope. Using the population synthesis method based on star cluster, we analyze the nuclear stellar population and star formation history of NGC5018. The results indicates that the continuum flux fraction at 5870 Å owing to an old component is ?64%, and that of very young components (Tx108 yr) is < 1%. A very interesting result is there exist lots of T= 5 × 108 yr young stellar populations in this old elliptical galaxy. It is supported that the cause of the star formation is the influence of tidal interactions and minor mergers with other galaxies. The star formation history of the elliptical galaxies may be very complex. Our results can give the observation characters of NGC5018 a good explanation.

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