Subjects: Astronomy >> Astrophysical processes submitted time 2023-02-19
John R. Weaver
Sam E. Cutler
Richard Pan
Katherine E. Whitaker
Ivo Labbe
Sedona H. Price
Rachel Bezanson
Gabriel Brammer
Danilo Marchesini
Joel Leja
Bingjie Wang
Lukas J. Furtak
Adi Zitrin
Hakim Atek
Dan Coe
Pratika Dayal
Pieter van Dokkum
Robert Feldmann
Natascha Forster Schreiber
Marijn Franx
Abstract： In November 2022, the James Webb Space Telescope (JWST) returned deep near-infrared images of Abell~2744 -- a powerful lensing cluster capable of magnifying distant, incipient galaxies beyond it. Together with the existing Hubble Space Telescope (HST) imaging, this publicly available dataset opens a fundamentally new discovery space to understand the remaining mysteries of the formation and evolution of galaxies across cosmic time. In this work, we detect and measure some 50,000 objects across the 45 arcmin$^2$ JWST footprint down to a $5\,\sigma$ limiting magnitude of $\sim$29.9\,mag in 0.32" apertures. Photometry is performed using circular apertures on images matched to the point spread function of the reddest NIRCam band, F444W, and cleaned of bright cluster galaxies and the related intra-cluster light. To give an impression of the photometric performance, we measure photometric redshifts and achieve a $\sigma_{\rm NMAD}\approx0.03$ based on known, but relatively small, spectroscopic samples. With this paper, we publicly release HST and JWST PSF-matched photometric catalogs optimized for bright and extended sources (0.7" apertures) and compact and faint sources (0.32" apertures) along with basic photometric redshifts, rest-frame colors, and individual magnification estimates. These catalogs will set the stage for efficient and deep spectroscopic follow-up of the first JWST-selected samples in Summer 2023.
Peer Review Status:
Awaiting Review
Subjects: Astronomy >> Astrophysical processes submitted time 2023-02-19
Rachel Bezanson
Ivo Labbe
Katherine E. Whitaker
Joel Leja
Sedona H. Price
Marijn Franx
Gabe Brammer
Danilo Marchesini
Adi Zitrin
Bingjie Wang
John R. Weaver
Lukas J. Furtak
Hakim Atek
Dan Coe
Sam E. Cutler
Pratika Dayal
Pieter van Dokkum
Robert Feldmann
Natascha Forster Schreiber
Seiji Fujimoto
Abstract： In this paper we describe the survey design for the Ultradeep NIRSpec and NIRCam ObserVations before the Epoch of Reionization (UNCOVER) Cycle 1 JWST Treasury program, which executed its early imaging component in November 2022. The UNCOVER survey includes ultradeep ($\sim29-30\mathrm{AB}$) imaging of $\sim$45 arcmin$^2$ on and around the well-studied Abell 2744 galaxy cluster at $z=0.308$ and will follow-up ${\sim}500$ galaxies with extremely deep low-resolution spectroscopy with the NIRSpec/PRISM during the summer of 2023. We describe the science goals, survey design, target selection, and planned data releases. We also present and characterize the depths of the first NIRCam imaging mosaic, highlighting previously unparalleled resolved and ultradeep 2-4 micron imaging of known objects in the field. The UNCOVER primary NIRCam mosaic spans 28.8 arcmin$^2$ in seven filters (F115W, F150W, F200W, F277W, F356W, F410M, F444W) and 16.8 arcmin$^2$ in our NIRISS parallel (F115W, F150W, F200W, F356W, and F444W). To maximize early community use of the Treasury data set, we publicly release full reduced mosaics of public JWST imaging including 45 arcmin$^2$ NIRCam and 17 arcmin$^2$ NIRISS mosaics on and around the Abell 2744 cluster, including the Hubble Frontier Field primary and parallel footprints.
Peer Review Status:Awaiting Review
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