Tracing the Mass Assmebly at Large Radii of Massive Quiescent Galaxies

Details Tracing the Mass Assmebly at Large Radii of Massive Quiescent Galaxies Tracing the Mass Assmebly at Large Radii of Massive Quiescent Galaxies

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21832802m&link_type=abstract

American Astronomical Society, AAS Meeting #218, #328.02; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Using high-resolution imaging data from the Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey (CANDELS), we examine the growth of spheroids from z 2.5 to the present. Evidence that massive quiescent galaxies undergo dramatic size evolution since z 2.5 has been steadily increasing. The compact sizes of high-redshift quiescent galaxies imply densities that are up to two orders of magnitude greater than galaxies in the local Universe of similar mass. However, it is unclear whether measurements to-date, many of which have relied on rest-frame near-UV imaging, have been underestimated due to effects such as signal-to-noise and age or metallicity gradients. Recently it has been suggested that these compact galaxies could survive as the cores of massive ellipticals in the local Universe, growing low-surface-brightness halos through dry mergers, thus preserving the central mass density while increasing the effective radii. The depth of CANDELS imaging at both rest-frame near-UV and optical wavelengths allows us to reliably measure sizes and color gradients of passive galaxies for the first time over a large region of the sky, enabling us to determine when early-type galaxies start to grow their halos and how they evolve onto the local size-mass relation.

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