Comparing IMF-sensitive indices of intermediate-mass quiescent galaxies in various environments
| Autor: | Moein Mosleh, Elham Eftekhari, Alexandre Vazdekis, Saeed Tavasoli |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Initial mass function Stellar population media_common.quotation_subject FOS: Physical sciences Velocity dispersion Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy Redshift Spectral line Space and Planetary Science Sky Astrophysics of Galaxies (astro-ph.GA) Range (statistics) Astrophysics::Galaxy Astrophysics media_common |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 486:3788-3804 |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | Using samples drawn from the Sloan Digital Sky Survey, we study for the first time the relation between large-scale environments (Clusters, Groups and Voids) and the stellar Initial Mass Function (IMF). We perform an observational approach based on the comparison of IMF-sensitive indices of quiescent galaxies with similar mass in varying environments. These galaxies are selected within a narrow redshift interval ($ 0.020 < z < 0.055 $) and spanning a range in velocity dispersion from 100 to 200 kms$^{-1}$. The results of this paper are based upon analysis of composite spectra created by stacking the spectra of galaxies, binned by their velocity dispersion and redshift. The trends of spectral indices as measured from the stacked spectra, with respect to velocity dispersion, are compared in different environments. We find a lack of dependence of the IMF on the environment for intermediate-mass galaxy regime. We verify this finding by providing a more quantitative measurement of the IMF variations among galactic environments using MILES stellar population models with a precision of $\Delta\Gamma_{b}\sim0.2$. Comment: Accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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