{'fraction_non_alphanumeric': 0.018378378378378378, 'fraction_numerical': 0.005405405405405406, 'mean_word_length': 4.680981595092025, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
The shapes and ages of elliptical galaxies

In this paper we investigate the relation between the detailed isophotal shape of el- liptical galaxies and the strength of the Habsorption in their spectra. We find that disky galaxies have higher Hindices. Stellar population synthesis models show that the Hline is a good age indicator, hence disky galaxies tend to have younger mean ages than boxy galaxies. We show that the observed trend can be brought about by a contaminating young population, which we associate with the disky component. This population need only account for a small fraction of the total mass, for example if a contaminating population of age of 2Gyrs is superimposed on an old (12Gyr) ellipti- cal galaxy, then the observed trend can be explained if it contributes only 10% to the total mass. The size of this effect is consistent with the estimates of disk-to-total light ratios from surface photometry.