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A MegaCam Survey of Outer Halo Satellites. VII. A Single Sérsic Index versus Effective Radius Relation for Milky Way Outer Halo Satellites

Marchi-Lasch, Sebastián and Muñoz, Ricardo R. and Santana, Felipe A. and Carballo-Bello, Julio A. and Chanamé, Julio and Geha, Marla and Simon, Joshua D. and Stetson, Peter B. and Djorgovski, S. G. (2019) A MegaCam Survey of Outer Halo Satellites. VII. A Single Sérsic Index versus Effective Radius Relation for Milky Way Outer Halo Satellites. Astrophysical Journal, 874 (1). Art. No. 29. ISSN 1538-4357. doi:10.3847/1538-4357/ab089c.

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In this work, we use structural properties of the Milky Way's outer halo (R_G > 25 kpc) satellites (dwarf spheroidal galaxies, ultra-faint dwarf (UFD) galaxies and globular clusters (GCs)) derived from deep, wide-field, and homogeneous data to present evidence of a correlation in the Sérsic index versus effective radius plane followed by a large fraction of outer halo GCs and satellite dwarf galaxies. We show that this correlation can be entirely reproduced by fitting empirical relations in the central surface brightness versus absolute magnitude and Sérsic index versus absolute magnitude parameter spaces, and by assuming the existence of two types of outer halo GCs: one of high surface brightness (HSB group), with properties similar to those of inner halo clusters; and another of low surface brightness (LSB group), which share characteristics with dwarf spheroidal and UFD galaxies. Given the similarities of LSB clusters with dwarf spheroidal and UFD galaxies, we discuss the possibility that outer halo clusters also originated inside dark matter halos and that tidal forces from different host galaxy potentials are responsible for the different properties between HSB and LSB clusters.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Marchi-Lasch, Sebastián0000-0002-4368-9835
Santana, Felipe A.0000-0002-4023-7649
Geha, Marla0000-0002-7007-9725
Stetson, Peter B.0000-0001-6074-6830
Djorgovski, S. G.0000-0002-0603-3087
Additional Information:© 2019 The American Astronomical Society. Received 2018 November 8; revised 2019 February 14; accepted 2019 February 18; published 2019 March 19. Based on observations obtained at the Canada–France–Hawaii Telescope (CFHT), which is operated by the National Research Council of Canada, the Institut National des Sciences de l'Univers of the Centre National de la Recherche Scientifique of France, and the University of Hawaii. This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. S.M-L. acknowledges support from CONICYT/Doctorado Nacional/2013-21130655. J.A.C-B. acknowledges financial support from CAS-CONICYT 17003. R.R.M. acknowledges partial support from BASAL Project AFB-170002 as well as FONDECYT project N°1170364.
Funding AgencyGrant Number
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)2013-21130655
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)17003
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1170364
Subject Keywords:galaxies: dwarf – Galaxy: halo – globular clusters: general
Issue or Number:1
Record Number:CaltechAUTHORS:20190320-074508464
Persistent URL:
Official Citation:Sebastián Marchi-Lasch et al 2019 ApJ 874 29
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:93977
Deposited By: Tony Diaz
Deposited On:20 Mar 2019 15:17
Last Modified:16 Nov 2021 17:02

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