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Title: Comparing IMF-sensitive indices of intermediate-mass quiescent galaxies in various environments

Abstract

ABSTRACT 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 km s−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 ΔΓb ∼ 0.2.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [3]
  1. Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain, Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain
  2. Biruni Observatory, Shiraz University, Shiraz 71454, Iran, Physics Department, Shiraz University, Shiraz 71454, Iran
  3. Faculty of Physics, Kharazmi University, Mofateh Ave., Tehran, Iran
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1510142
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 486 Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Eftekhari, Elham, Mosleh, Moein, Vazdekis, Alexandre, and Tavasoli, Saeed. Comparing IMF-sensitive indices of intermediate-mass quiescent galaxies in various environments. United Kingdom: N. p., 2019. Web. doi:10.1093/mnras/stz1113.
Eftekhari, Elham, Mosleh, Moein, Vazdekis, Alexandre, & Tavasoli, Saeed. Comparing IMF-sensitive indices of intermediate-mass quiescent galaxies in various environments. United Kingdom. doi:10.1093/mnras/stz1113.
Eftekhari, Elham, Mosleh, Moein, Vazdekis, Alexandre, and Tavasoli, Saeed. Thu . "Comparing IMF-sensitive indices of intermediate-mass quiescent galaxies in various environments". United Kingdom. doi:10.1093/mnras/stz1113.
@article{osti_1510142,
title = {Comparing IMF-sensitive indices of intermediate-mass quiescent galaxies in various environments},
author = {Eftekhari, Elham and Mosleh, Moein and Vazdekis, Alexandre and Tavasoli, Saeed},
abstractNote = {ABSTRACT 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 km s−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 ΔΓb ∼ 0.2.},
doi = {10.1093/mnras/stz1113},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 486,
place = {United Kingdom},
year = {2019},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1093/mnras/stz1113

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