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 identify 4 unusually bright (H < 25.5) galaxies from HST and SpitzerCANDELS data with probable redshifts z ~ 7-9. These identifications include thebrightest-known galaxies to date at z > 7.5. As Y-band observations are notavailable over the full CANDELS program to perform a standard Lyman-breakselection of z > 7 galaxies, we employ an alternate strategy using deepSpitzer/IRAC data. We identify z ~ 7.1 - 9.1 galaxies by selecting z >~ 6galaxies from the HST CANDELS data that show quite red IRAC [3.6]-[4.5] colors,indicating strong [OIII]+Hbeta lines in the 4.5 micron band. This selectionstrategy was validated using a modest sample for which we have deep Y-bandcoverage, and subsequently used to select the brightest z > 7 sources. Applyingthe IRAC criteria to all HST-selected optical-dropout galaxies over the full~900 arcmin**2 of the CANDELS survey revealed four unusually bright z ~ 7.1,7.6, 7.9 and 8.6 candidates. The median [3.6]-[4.5] color of our selected z ~7.1-9.1 sample is consistent with rest-frame [OIII]+Hbeta EWs of ~1500A, in the[4.5] band. Keck/MOSFIRE spectroscopy has been independently reported for twoof our selected sources, showing Ly-alpha at redshifts of 7.7302+/-0.0006 and8.683^+0.001_-0.004, respectively. We present similar Keck/MOSFIRE spectroscopyfor a third selected galaxy with a probable 4.7sigma Ly-alpha line atz_spec=7.4770+/-0.0008. All three have H-band magnitudes of ~25 mag and are~0.5 mag more luminous (M(UV) ~ -22.0) than any previously discovered z ~ 8galaxy, with important implications for the UV LF. Our 3 brightest, highestredshift z > 7 galaxies all lie within the CANDELS EGS field, providing adramatic illustration of the potential impact of field-to-field variance.

astrophysical journal/the astrophysical journal

Z > 7 galaxies with red Spitzer/IRAC [3.6]-[4.5] colors in the full  CANDELS data set: the brightest-known galaxies at Z ~ 7-9 and a probable  spectroscopic confirmation at Z=7.48