English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present a sample of over 50 luminous field bulges (including ellipticals)found in the Groth Strip Survey (GSS), with 0.73< z < 1.04 and with bulgemagnitudes I <= 23. The exponential disk light is removed via decomposition ofHST images using GIM2D. We find that 85% of these bulges are nearly as red aslocal E/S0's and have a shallow slope and a small color dispersion in thecolor-luminosity relation, suggesting roughly coeval formation. The surfacebrightnesses of these bulges are about 1 mag higher than local bulges. Theseresults are explained adopting a "drizzling" scenario where a metal-rich earlyformation is later polluted by small amounts of additional star formation.Almost all disks have the same or bluer colors than their accompanying bulges,regardless of the bulge-disk ratio and bulge luminosity, as expected fromsemi-analytic hierarchical galaxy formation models. We present evidence thatthe few blue bulge candidates are not likely to be genuine blue ellipticals orbulges. Our deeper, more extensive, and less disk-contaminated observationschallenge prior claims that 30% to 50% of field bulges or ellipticals are in ablue, star-forming phase at z < 1. We conclude that field bulges andellipticals at z ~ 1, like luminous early- type cluster galaxies at the sameredshift, are already dominated by metal-rich, old stellar populations thathave been fading from a formation epoch earlier than z ~ 1.5. (abridged)

The DEEP Groth Strip Survey. VIII. The Evolution of Luminous Field Bulges at Redshift z ∼ 1