Skip to content
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Dense cores in galaxies out to z = 2.5 in SDSS, UltraVISTA, and the five 3D-HST/candels fields
Astrophysical Journal, Volume 791, No. 1, Article 45, Year 2014
Notification
URL copied to clipboard!
Description
The dense interiors of massive galaxies are among the most intriguing environments in the universe. In this paper,we ask when these dense cores were formed and determine how galaxies gradually assembled around them. We select galaxies that have a stellar mass >3 × 1010 M inside r = 1 kpc out to z = 2.5, using the 3D-HST survey and data at low redshift. Remarkably, the number density of galaxies with dense cores appears to have decreased from z = 2.5 to the present. This decrease is probably mostly due to stellar mass loss and the resulting adiabatic expansion, with some contribution from merging. We infer that dense cores were mostly formed at z > 2.5, consistent with their largely quiescent stellar populations. While the cores appear to form early, the galaxies in which they reside show strong evolution: their total masses increase by a factor of 2-3 from z = 2.5 to z = 0 and their effective radii increase by a factor of 5-6. As a result, the contribution of dense cores to the total mass of the galaxies in which they reside decreases from 50% at z = 2.5 to 15% at z = 0. Because of their early formation, the contribution of dense cores to the total stellar mass budget of the universe is a strong function of redshift. The stars in cores with M 1 kpc > 3 × 1010 M ̇make up 0.1% of the stellar mass density of the universe today but 10%-20% at z 2, depending on their initial mass function. The formation of these cores required the conversion of 1011 M of gas into stars within 1 kpc, while preventing significant star formation at larger radii. © 2014. The American Astronomical Society. All rights reserved..
Authors & Co-Authors
Van Dokkum, Pieter G.
United States, New Haven
Yale University
Bezanson, Rachel S.
United States, Tucson
The University of Arizona
van der Wel, Arjen
Germany, Heidelberg
Max Planck Institute for Astronomy
Nelson, Erica June
United States, New Haven
Yale University
Momcheva, Ivelina G.
United States, New Haven
Yale University
Skelton, Rosalind E.
South Africa, Cape Town
University of Cape Town
Whitaker, Katherine E.
United States, Greenbelt
Nasa Goddard Space Flight Center
Brammer, Gabriel B.
United States, Baltimore
Space Telescope Science Institute
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
Fumagalli, Mattia
Netherlands, Leiden
Sterrewacht Leiden
Kriek, Mariska T.
United States, Berkeley
University of California, Berkeley
Labbé, Ivo
South Africa, Cape Town
University of Cape Town
Leja, Joel
United States, New Haven
Yale University
Marchesini, Danilo M.
United States, Medford
Tufts University
Muzzin, Adam V.
South Africa, Cape Town
University of Cape Town
Oesch, P. A.
United States, New Haven
Yale University
Wuyts, Stijn
Netherlands, Leiden
Sterrewacht Leiden
Statistics
Citations: 96
Authors: 18
Affiliations: 11
Identifiers
Doi:
10.1088/0004-637X/791/1/45
ISSN:
0004637X
e-ISSN:
15384357
Study Design
Cross Sectional Study
Study Approach
Quantitative