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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We have analysed a sample of 25 extremely red H-[4.5]>4 galaxies, selectedusing 4.5 micron data from the Spitzer SEDS survey and deep H-band data fromthe Hubble Space Telescope (HST) CANDELS survey, over ~180 square arcmin of theUKIDSS Ultra Deep Survey (UDS) field. Our aim is to investigate the nature ofthis rare population of mid-infrared (mid-IR) sources that display such extremenear-to-mid-IR colours. Using up to 17-band photometry (U through 8.0 microns),we have studied in detail their spectral energy distributions, includingpossible degeneracies in the photometric redshift/internal extinction(zphot-Av) plane. Our sample appears to include sources of very differentnature. Between 45% and 75% of them are dust-obscured, massive galaxies at3<zphot<5. All of the 24 micron-detected sources in our sample are in thiscategory. Two of these have S(24 micron)>300 microJy, which at 3<zphot<5suggests that they probably host a dust-obscured active galactic nucleus (AGN).Our sample also contains four highly obscured (Av>5) sources at zphot<1.Finally, we analyse in detail two zphot~6 galaxy candidates, and discuss theirplausibility and implications. Overall, our red galaxy sample contains the tipof the iceberg of a larger population of z>3 galaxies to be discovered with thefuture James Webb Space Telescope.

The Nature of Extremely Red H-[4.5]>4 Galaxies revealed with SEDS and CANDELS