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Metallicity Gradients in the Halos of Elliptical Galaxies

Published online by Cambridge University Press:  09 May 2016

Jenny E. Greene ,
Chung-Pei Ma ,
Andrew Goulding ,
Nicholas J. McConnell ,
John P. Blakeslee ,
Timothy Davis  and
Jens Thomas
Jenny E. Greene
Affiliation:
Department of Astrophysics, Princeton University, Princeton, NJ 08544, USA
Chung-Pei Ma
Affiliation:
Department of Astronomy, University of California, Berkeley, CA 94720, USA
Andrew Goulding
Affiliation:
Department of Astrophysics, Princeton University, Princeton, NJ 08544, USA
Nicholas J. McConnell
Affiliation:
Dominion Astrophysical Observatory, NRC Herzberg Institute of Astrophysics, Victoria, BC V9E 2E7, Canada
John P. Blakeslee
Affiliation:
Dominion Astrophysical Observatory, NRC Herzberg Institute of Astrophysics, Victoria, BC V9E 2E7, Canada
Timothy Davis
Affiliation:
Centre for Astrophysics Research, University of Hertfordshire, Hatfield, Herts AL10 9AB, UK
Jens Thomas
Affiliation:
Max Planck-Institute for Extraterrestrial Physics, Giessenbachstr. 1, D-85741 Garching, Germany
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Abstract

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We discuss the stellar halos of massive elliptical galaxies, as revealed by our ambitious integral-field spectroscopic survey MASSIVE. We show that metallicity drops smoothly as a function of radius out to ~ 2.5 Re, while the [α/Fe] abundance ratios stay flat. The stars in the outskirts likely formed rapidly (to explain the high ratio of alpha to Fe) but in a relatively shallow potential (to explain the low metallicities). This is consistent with expectations for a two-phase growth of massive galaxies, in which the second phase involves accretion of small satellites. We also show some preliminary study of the gas content of these most MASSIVE galaxies.

Keywords

galaxies: elliptical and lenticularcDgalaxies: evolutiongalaxies: kinematics and dynamicsgalaxies: stellar content
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Issue S317: The General Assembly of Galaxy Halos: Structure, Origin and Evolution , August 2015 , pp. 182 - 189
Copyright
Copyright © International Astronomical Union 2016 

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