Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.273..945s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 273, Issue 4, pp. 945-957.
Astronomy and Astrophysics
Astronomy
16
Galaxies: Elliptical And Lenticular, Cd, Galaxies: Evolution, Galaxies: Starburst, Galaxies: Stellar Content
Scientific paper
In order to gain a better understanding of starburst and merger events, we have extended to dwarf galaxies our previous spectral simulations of burst evolution over 3 Gyr, superimposed on an old underlying stellar population. We have used a library of star cluster and galaxy integrated spectra in the 3700-9700 A wavelength range. Two kinds of galaxy spectra representing the underlying red stellar populations have been considered: (i) an average spectrum of the central regions of NGC 3056 and 4476, for which previous population syntheses have shown a maximum metallicity of [Z/Z_solar]=-0.5, and (ii) a combination of globular cluster spectra in the range -2<=[Z/Z_solar]<=-1, which could represent the old stellar population in the transition between dwarf ellipticals and dwarf spheroidals. These spectra were combined with those of Large Magellanic Cloud (LMC) and Galactic disc star clusters in the 3-Myr to 3-Gyr age range, in order to simulate starburst events in dwarf galaxies and model the subsequent spectral evolution on the composite system. The star cluster spectra have been properly scaled to represent starburst-to-galaxy mass fractions of 10, 1 and 0.1 per cent. The resulting models form a spectral atlas for comparisons with observations. Rest-frame BVRI magnitudes and the related colours have been derived from these models, as well as the equivalent widths for a set of metallic and Balmer features. The behaviour of these indices is analysed as a function of the burst age and strength. The results can be used to study the properties of star-forming events in galaxies.
Alloin Danielle
Bica Eduardo
Schmidt Alex A.
No associations
LandOfFree
Simulations of starburst spectral evolution superimposed on old populations: extension to dwarf ellipticals does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Simulations of starburst spectral evolution superimposed on old populations: extension to dwarf ellipticals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Simulations of starburst spectral evolution superimposed on old populations: extension to dwarf ellipticals will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1830382