Lecture5 - Properties of Elliptical Galaxies I Stellar...

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Properties of Elliptical Galaxies – I. Stellar Populations and the Interstellar Medium Brightest stars are red giants and AGB stars w/ spectral type K, M Very few stars produced in the last 1 – 2 Gyr Stars at the center of E’s have ~solar metallicity (differ from MW’s GCs but like MW bulge) Color of integrated galaxy light correlates with galaxy luminosity Fainter/smaller galaxies are bluer either less massive E’s are younger or metal poor
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Galaxies with more recent SF ( younge r stars) are bluer Spectra of model galaxies show “bluer” E’s – so called E+A galaxies After 10 Gyr, looks like a typical E Galaxies that are more metal poor  are bluer Metal absorption lines are strongest in the biggest Ellipticals which are redde Also, there is a color gradient in Ellipticals Redder toward the center – more metal rich (based on strength of Mg lines) Model of galaxy that makes all stars in 10
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~90,000 galaxies from SDSS – luminous galaxies richer in heavy elements and complete their starbirth earlier Why are less massive galaxies metal poor? Unable to retain most of the metal-rich gas shed by aging stars based on strength of Halpha line and H&K break
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Ellipticals have lots of globular clusters (about twice that of disk galaxies) these fall into two groups based on color
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This note was uploaded on 07/11/2011 for the course AST 6309 taught by Professor Sarajedini during the Spring '11 term at University of Florida.

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Lecture5 - Properties of Elliptical Galaxies I Stellar...

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