Document Type

Article

Publication Date

January 2017

Publication Title

Monthly Notices of the Royal Astronomical Society Letters

Volume

464

Issue Number

1

First Page

L26

Last Page

L30

DOI

10.1093/mnrasl/slw176

Keywords

galaxies: elliptical and lenticular, cD, galaxies: evolution, galaxies: haloes, X-rays: galaxies

Disciplines

Astrophysics and Astronomy | External Galaxies

Abstract

Here we utilize recent measures of galaxy total dynamical mass and X-ray gas luminosities (LX,Gas) for a sample of 29 massive early-type galaxies from the SLUGGS survey to probe LX, Gas–mass scaling relations. In particular, we investigate scalings with stellar mass, dynamical mass within 5 effective radii (Re) and total virial mass. We also compare these relations with predictions from Λ cold dark matter simulations. We find a strong linear relationship between LX, Gas and galaxy dynamical mass within 5Re, which is consistent with the recent cosmological simulations of Choi et al. that incorporate mechanical heating from AGN. We conclude that the gas surrounding massive early-type galaxies was shock-heated as it fell into collapsing dark matter haloes so that LX, Gas is primarily driven by the depth of a galaxy's potential well. Heating by an AGN plays an important secondary role in determining LX, Gas.

Comments

This article was originally published in Monthly Notices of the Royal Astronomical Society Letters, volume 464, issue 1. ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
This article can also be found online at the following link: https://doi.org/10.1093/mnrasl/slw176

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