Journal article
RELICS-DP7: Spectroscopic Confirmation of a Dichromatic Primeval Galaxy at z 7
D Pelliccia, V Strait, BC Lemaux, M Bradač, D Coe, P Bolan, LD Bradley, B Frye, PJ Gandhi, R Mainali, C Mason, M Ouchi, K Sharon, M Trenti, A Zitrin
Astrophysical Journal Letters | IOP Publishing Ltd | Published : 2021
Abstract
We report the discovery of a spectroscopically confirmed strong Ly emitter at z = 7.0281 ± 0.0003, observed as part of the Reionization Lensing Cluster Survey (RELICS). This galaxy, dubbed "Dichromatic Primeval Galaxy"at z 7 (DP7), shows two distinct components. While fairly unremarkable in terms of its ultraviolet (UV) luminosity, where is the characteristic luminosity), DP7 has one of the highest observed Ly equivalent widths (EWs) among Ly emitters at z > 6 (>200 Å in the rest frame). The strong Ly emission generally suggests a young metal-poor, low-dust galaxy; however, we find that the UV slope β of the galaxy as a whole is redder than typical star-forming galaxies at these redshifts,-1..
View full abstractGrants
Awarded by National Science Foundation
Funding Acknowledgements
Support for this work was provided by NASA through NSF grant AST 1815458, NASA ADAP grant 80NSSC18K0945, NASA HST grant HST-GO-14096, and through an award issued by JPL/Caltech. V.S. also acknowledges support through Heising-Simons Foundation Grant #2018-1140. Data presented here is part of the RELICS Hubble Treasury Program (GO 14096), which consists of observations obtained by the NASA/ESA Hubble Space Telescope (HST). Hubble is operated by the Association of Universities for Research in Astronomy, Inc. (AURA), under NASA contract NAS5-26555. Data from the NASA/ESA Hubble Space Telescope presented in this Letter were obtained from the Mikulski Archive for Space Telescopes (MAST), operated by the Space Telescope Science Institute (STScI). STScI is operated by the Association of Universities for Research in Astronomy, Inc. (AURA) under NASA contract NAS 5-26555. The Hubble Advanced Camera for Surveys (ACS) was developed under NASA contract NAS 5-32864. Spitzer Space Telescope data presented in this Letter were obtained from the NASA/IPAC Infrared Science Archive (IRSA), operated by the Jet Propulsion Laboratory, California Institute of Technology. Spitzer and IRSA are operated by the Jet Propulsion Laboratory, California Institute of Technology under contract with NASA. The spectroscopic data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation. We thank the indigenous Hawaiian community for allowing us to be guests on their sacred mountain, a privilege, without which, this work would not have been possible. We are most fortunate to be able to conduct observations from this site.