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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
The assembly of milky-way-like galaxies since z ∼ 2.5
Astrophysical Journal Letters, Volume 771, No. 2, Article L35, Year 2013
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Description
Galaxies with the mass of the Milky Way dominate the stellar mass density of the universe but it is uncertain how and when they were assembled. Here we study progenitors of these galaxies out to z = 2.5, using data from the 3D-HST and CANDELS Treasury surveys. We find that galaxies with present-day stellar masses of log (M) ≈ 10.7 built ∼90% of their stellar mass since z = 2.5, with most of the star formation occurring before z = 1. In marked contrast to the assembly history of massive elliptical galaxies, mass growth is not limited to large radii: the mass in the central 2 kpc of the galaxies increased by a factor of between z = 2.5 and z = 1. We therefore rule out simple models in which bulges were fully assembled at high redshift and disks gradually formed around them. Instead, bulges (and black holes) likely formed in lockstep with disks, through bar instabilities, migration, or other processes. We find that after z = 1 the growth in the central regions gradually stopped and the disk continued to be built up, consistent with recent studies of the gas distributions in z ∼ 1 galaxies and the properties of many spiral galaxies today. © 2013. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Van Dokkum, Pieter G.
United States, New Haven
Yale University
Leja, Joel
United States, New Haven
Yale University
Nelson, Erica June
United States, New Haven
Yale University
Patel, Shannon G.
Netherlands, Leiden
Universiteit Leiden
Skelton, Rosalind E.
United States, New Haven
Yale University
Momcheva, Ivelina G.
United States, New Haven
Yale University
Brammer, Gabriel B.
Chile, Santiago
European Southern Observatory Santiago
Whitaker, Katherine E.
United States, Greenbelt
Nasa Goddard Space Flight Center
Lundgren, Britt Fisher
United States, Madison
University of Wisconsin-madison
Fumagalli, Mattia
Netherlands, Leiden
Universiteit Leiden
Conroy, Charlie
United States, Santa Cruz
University of California, Santa Cruz
Förster-Schreiber, Natascha M.F.
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Franx, Marijn
Netherlands, Leiden
Universiteit Leiden
Kriek, Mariska T.
United States, Berkeley
University of California, Berkeley
Labbé, Ivo
Netherlands, Leiden
Universiteit Leiden
Marchesini, Danilo M.
United States, Medford
Tufts University
Rix, Hans Walter R.
Germany, Heidelberg
Max Planck Institute for Astronomy
van der Wel, Arjen
Germany, Heidelberg
Max Planck Institute for Astronomy
Wuyts, Stijn
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Statistics
Citations: 205
Authors: 19
Affiliations: 10
Identifiers
Doi:
10.1088/2041-8205/771/2/L35
ISSN:
20418213
Study Design
Cross Sectional Study