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http://hdl.handle.net/20.500.12386/30849
Titolo: | The initial mass function of a massive relic galaxy | Autori: | Ignacio Martín-Navarro LA BARBERA, Francesco Alexandre Vazdekis Anna Ferré-Mateu Ignacio Trujillo Michael A. Beasley |
Data pubblicazione: | 2015 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 451 | Fascicolo: | 1 | Da pagina:: | 1081 | Abstract: | Massive relic galaxies formed the bulk of their stellar component before z~2 and have remained unaltered since then. Therefore, they represent a unique opportunity to study in great detail the frozen stellar population properties of those galaxies that populated the primitive Universe. We have combined optical to near-infrared line-strength indices in order to infer, out to 1.5 Reff, the IMF of the nearby relic massive galaxy NGC 1277. The IMF of this galaxy is bottom-heavy at all radii, with the fraction of low-mass stars being at least a factor of two larger than that found in the Milky Way. The excess of low-mass stars is present throughout the galaxy, while the velocity dispersion profile shows a strong decrease with radius. This behaviour suggests that local velocity dispersion is not the only driver of the observed IMF variations seen among nearby early-type galaxies. In addition, the excess of low-mass stars shown in NGC 1277 could reflect the effect on the IMF of dramatically different and intense star formation processes at z~2, compared to the less extreme conditions observed in the local Universe. | URI: | http://hdl.handle.net/20.500.12386/30849 | URL: | http://arxiv.org/abs/1505.01485v2 https://academic.oup.com/mnras/article/451/1/1081/1346118 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stv1022 | Bibcode ADS: | 2015MNRAS.451.1081M | Fulltext: | open |
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