IMF shape constraints from stellar populations and dynamics from CALIFA
| Autor: | Lyubenova, M., Martín-Navarro, I., van de Ven, G., Falcón-Barroso, J., Galbany, L., Gallazzi, A., García-Benito, R., Delgado, R. González, Husemann, B., La Barbera, F., Marino, R. A., Mast, D., Mendez-Abreu, J., Peletier, R. F. P., Sánchez-Blázquez, P., Sánchez, S. F., Trager, S. C., Bosch, R. C. E. van den, Vazdekis, A., Walcher, C. J., Zhu, L., Zibetti, S., Ziegler, B., Bland-Hawthorn, J., collaboration, the CALIFA |
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| Rok vydání: | 2016 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/stw2434 |
| Popis: | In this letter we describe how we use stellar dynamics information to constrain the shape of the stellar IMF in a sample of 27 early-type galaxies from the CALIFA survey. We obtain dynamical and stellar mass-to-light ratios, $\Upsilon_\mathrm{dyn}$ and $\Upsilon_{\ast}$, over a homogenous aperture of 0.5~$R_{e}$. We use the constraint $\Upsilon_\mathrm{dyn} \ge \Upsilon_{\ast}$ to test two IMF shapes within the framework of the extended MILES stellar population models. We rule out a single power law IMF shape for 75% of the galaxies in our sample. Conversely, we find that a double power law IMF shape with a varying high-mass end slope is compatible (within 1$\sigma$) with 95% of the galaxies. We also show that dynamical and stellar IMF mismatch factors give consistent results for the systematic variation of the IMF in these galaxies. Comment: 6 pages, 3 figures, accepted for publication in MNRAS Letters |
| Databáze: | arXiv |
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