J/ApJ/910/135 RELICS 6<~z<=8 galaxies with Spitzer & HST obs. (Strait+, 2021) ================================================================================ RELICS: Properties of z>=5.5 galaxies inferred from Spitzer and Hubble imaging, including a candidate z~6.8 strong [OIII] emitter. Strait V., Bradac M., Coe D., Lemaux B.C., Carnall A.C., Bradley L., Pelliccia D., Sharon K., Zitrin A., Acebron A., Neufeld C., Andrade-Santos F., Avila R.J., Frye B.L., Mahler G., Nonino M., Ogaz S., Oguri M., Ouchi M., Paterno-Mahler R., Stark D.P., Mainali R., Oesch P.A., Trenti M., Carrasco D., Dawson W.A., Jones C., Umetsu K., Vulcani B. =2021ApJ...910..135S ================================================================================ ADC_Keywords: Galaxies, photometry; Photometry, HST; Optical; Infrared; Redshifts; Surveys; Gravitational lensing; Magnitudes, absolute; Clusters, galaxy Keywords: High-redshift galaxies ; Galaxies Abstract: We present constraints on the physical properties (including stellar mass, age, and star formation rate) of 207 6<=z<=8 galaxy candidates from the Reionization Lensing Cluster Survey (RELICS) and Spitzer-RELICS surveys. We measure photometry using T-PHOT and perform spectral energy distribution fitting using EAzY and BAGPIPES. Of the 207 candidates for which we could successfully measure (or place limits on) Spitzer fluxes, 23 were demoted to likely z<4. Among the high-z candidates, we find intrinsic stellar masses between 1x10^6^M_{sun}_ and 4x10^9^M_{sun}_, and rest-frame UV absolute magnitudes between -22.6 and -14.5mag. While our sample is mostly comprised of L_mUV_/L_mUV_^*^<1 galaxies, it extends to L_mUV_/L_mUV_^*^~2. Our sample spans ~4 orders of magnitude in stellar mass and star formation rates, and exhibits ages that range from maximally young to maximally old. We highlight 11 z>=6.5 galaxies with detections in Spitzer/IRAC imaging, several of which show evidence for some combination of evolved stellar populations, large contributions of nebular emission lines, and/or dust. Among these is PLCKG287+32-2013, one of the brightest z~7 candidates known (AB mag 24.9 at 1.6{mu}m) with a Spitzer 3.6{mu}m flux excess suggesting strong [OIII]+H-{beta} emission (~1000{AA} rest-frame equivalent width). We discuss the possible uses and limits of our sample and present a public catalog of Hubble + Spitzer photometry along with physical property estimates for all objects in the sample. Description: All imaging data used for this analysis were obtained through a combination of RELICS and archival data. Each cluster was observed with HST and Spitzer. Here we briefly summarize the observing strategy of the survey, but in-depth information about observations can be found on the RELICS website (http://relics.stsci.edu/) and in the RELICS overview paper (Coe+ 2019, J/ApJ/884/85). Each cluster was observed with two orbits of Wide Field Camera 3 (WFC3)/IR imaging split among the F105W, F125W, F140W, and F160W filters, and three orbits of Advanced Camera for Surveys (ACS) split among F435W, F606W, and F814W (minus archival optical imaging), for a total of 188 HST orbits. Several clusters had archival ACS and/or WFC3 imaging in other filters (F390W, F475W, F555W, F625W, F775W, F850LP, F110W) and some clusters that received additional data from a subsequent proposal. Spitzer/IRAC images for all clusters come from S-RELICS (Spitzer-RELICS, PI Bradac #12005, 13165, 13210, Director's Discretionary Time, PI Soifer #12123), for a total of over 1000hr of exposure time, and additional archival data. See Section 2.2. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 87 41 Exposure times and programs of Spitzer data relics-z.dat 1828 207 RELICS high-z catalog -------------------------------------------------------------------------------- See also: J/ApJ/738/69 : SEDs of galaxies at 3.8