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

Examining a sample of massive galaxies at 1.4<z<2.5 with K_{Vega}<22 from theGreat Observatories Origins Deep Survey, we compare photometry from Spitzer atmid- and far-IR, to submillimeter, radio and rest-frame ultravioletwavelengths, to test the agreement between different tracers of star formationrates (SFRs) and to explore the implications for galaxy assembly. For z~2galaxies with moderate luminosities(L_{8um}<10^{11}L_sun), we find that the SFRcan be estimated consistently from the multiwavelength data based on localluminosity correlations. However,20--30% of massive galaxies, and nearly allthose with L_{8um}>10^{11}L_sun, show a mid-IR excess which is likely due tothe presence of obscured active nuclei, as shown in a companion paper. There isa tight and roughly linear correlation between stellar mass and SFR for24um-detected galaxies. For a given mass, the SFR at z=2 was larger by a factorof ~4 and ~30 relative to that in star forming galaxies at z=1 and z=0,respectively. Typical ultraluminous infrared galaxies (ULIRGs) at z=2 arerelatively 'transparent' to ultraviolet light, and their activity is long lived(~400 Myr), unlike that in local ULIRGs and high redshiftsubmillimeter-selected galaxies. ULIRGs are the common mode of star formationin massive galaxies at z=2, and the high duty cycle suggests that major mergersare not the dominant trigger for this activity.Current galaxy formation modelsunderpredict the normalization of the mass-SFR correlation by about a factor of4, and the space density of ULIRGs by an orderof magnitude, but give betteragreement for z>1.4 quiescent galaxies.

Multiwavelength study of massive galaxies at z~2. I. Star formation and galaxy growth