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The luminosity function of diverse satellite galaxy systems


Nickerson, S; Stinson, G; Couchman, H M P; Bailin, J; Wadsley, J (2013). The luminosity function of diverse satellite galaxy systems. Monthly Notices of the Royal Astronomical Society, 429(1):452-457.

Abstract

The high-resolution, smoothed particle hydrodynamics galaxies of the McMaster Unbiased Galaxy Survey are used to examine the satellite systems of 16 model host galaxies. Each galaxy has a different mass, angular momentum and merger history that yield a rich set of satellite luminosity functions. With new observations of distant satellite systems, we can compare these luminosity functions to satellite systems beyond the Local Group. We find that the luminosity functions of our simulations compare well to observations when the luminosity functions are scaled according to host mass. We use the recently found relationship between dwarf satellites and host mass in distant satellite systems to normalize a theoretical, complete luminosity function for the Milky Way. The luminosity function of satellites, expressed as a function of the host mass, is given by dN/dM_V=3.5M_host^{0.91}× 10^{0.1M_V-10.2}, where mass is given in Msun. The mass of a host galaxy can be used to predict the number of dwarf satellites and even when considering spiral and elliptical hosts separately this relation holds.

Abstract

The high-resolution, smoothed particle hydrodynamics galaxies of the McMaster Unbiased Galaxy Survey are used to examine the satellite systems of 16 model host galaxies. Each galaxy has a different mass, angular momentum and merger history that yield a rich set of satellite luminosity functions. With new observations of distant satellite systems, we can compare these luminosity functions to satellite systems beyond the Local Group. We find that the luminosity functions of our simulations compare well to observations when the luminosity functions are scaled according to host mass. We use the recently found relationship between dwarf satellites and host mass in distant satellite systems to normalize a theoretical, complete luminosity function for the Milky Way. The luminosity function of satellites, expressed as a function of the host mass, is given by dN/dM_V=3.5M_host^{0.91}× 10^{0.1M_V-10.2}, where mass is given in Msun. The mass of a host galaxy can be used to predict the number of dwarf satellites and even when considering spiral and elliptical hosts separately this relation holds.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:2013
Deposited On:22 Jan 2013 16:12
Last Modified:07 Dec 2017 18:35
Publisher:Wiley-Blackwell
ISSN:0035-8711
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1093/mnras/sts348

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