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Dwarf galaxies in the Coma cluster - I. Velocity dispersion measurements

Kourkchi, E and Khosroshahi, HG and Carter, D and Karick, AM and Marmol-Queralto, E and Chiboucas, K and Tully, RB and Mobasher, B and Guzman, R and Matkovic, A and Gruel, N (2012) Dwarf galaxies in the Coma cluster - I. Velocity dispersion measurements. Monthly Notices of the Royal Astronomical Society, 420 (4). pp. 2819-2834. ISSN 0035-8711

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Abstract

We present the study of a large sample of early-type dwarf galaxies in the Coma cluster observed with DEIMOS on the Keck II to determine their internal velocity dispersion. We
focus on a subsample of 41 member dwarf elliptical galaxies for which the velocity dispersion can be reliably measured, 26 of which were studied for the first time. The magnitude range of our sample is -21 < MR < -15 mag. This paper (Paper I) focuses on the measurement of the velocity dispersion and their error estimates. The measurements were performed using penalized pixel fitting (PPXF) and using the
calcium triplet absorption lines.We use Monte Carlo bootstrapping to study various sources of uncertainty in our measurements, namely statistical uncertainty, template mismatch and other systematics.We find that the main source of uncertainty is the template mismatch effect whichis reduced by using templates with a range of spectral types.
Combining our measurements with those from the literature, we study the Faber–Jackson relation (L ? sa) and find that the slope of the relation is a = 1.99 ± 0.14 for galaxies brighter than MR �-16 mag. A comprehensive analysis of the results combined with the photometric properties of these galaxies is reported in Paper II.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2012 The authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 19 Mar 2015 10:19
Last Modified: 08 Sep 2017 05:57
DOI or Identification number: 10.1111/j.1365-2966.2011.19899.x
URI: http://researchonline.ljmu.ac.uk/id/eprint/775

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