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Ultra Massive Passive Galaxies at z~1.7

Published online by Cambridge University Press:  17 August 2016

Liz Arcila-Osejo
Affiliation:
Saint Mary's University, 923 Robie Street, Halifax, N.S., Canada
Marcin Sawicki
Affiliation:
Saint Mary's University, 923 Robie Street, Halifax, N.S., Canada
Anneya Golob
Affiliation:
Saint Mary's University, 923 Robie Street, Halifax, N.S., Canada
Stephane Arnouts
Affiliation:
Laboratoire d'Astrophysique de Marseille, Rue Frdric Joliot Curie, 13013 Marseille, France CFHT, 65-1238 Mamalahoa Hwy, Waimea, Kamuela 96743, United States. email: [email protected]
Thibaud Moutard
Affiliation:
Laboratoire d'Astrophysique de Marseille, Rue Frdric Joliot Curie, 13013 Marseille, France CFHT, 65-1238 Mamalahoa Hwy, Waimea, Kamuela 96743, United States. email: [email protected]
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Abstract

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At redshift z~1.7 the Universe was at the peak of its star-formation activity. It is thus a puzzle why some galaxies, many of them very massive (M* ⩾ 1011 M⊙), had already chosen to stop forming stars. These ultra-massive galaxies, guaranteed to be the central galaxies of their host dark matter halos, must have attained very high rates of star formation to assemble their stellar masses in such a short amount of time. Using the largest (to date) K-selected gzKs survey of passive galaxies (in an effective area of ~ 27.5 deg2) we study the demographics of these dead monsters, hoping to help understand the quenching mechanism that shut them down.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2016