Seeing-Sorted Large Binocular Camera U-band Imaging of the Extended Groth Strip

Creators: Redshaw, Caleb; McCabe, Tyler; Otteson, Lillian; Windhorst, Rogier A.; Jansen, Rolf A.; Cohen, Seth H.; Carleton, Timothy; Ashcraft, Teresa A.; Nonino, Mario; Paris, Diego; Grazian, Andrea; Fontana, Adriano; Giallongo, Emanuele; Speziali, Roberto; Testa, Vincenzo; Boutsia, Konstantina; Koekemoer, Anton; O'Connell, Robert W.; Rutkowski, Michael J.; Ryan, Russell E.; Scarlata, Claudia; Teplitz, Harry I.; Wang, Xin; Rafelski, Marc; Grogin, Norman A.

Abstract

We present the results of deep ground-based U-band imaging of the Extended Groth Strip (EGS) field, and the creation of a best resolution mosaic and a best depth mosaic following the seeing-sorted stacking method of Ashcraft et al. The analysis uses 324 images taken from 2012 March to 2021 June using the Large Binocular Camera. The best resolution mosaic includes the 16.4% of images with FWHM ≤ 0.″9, while the best depth mosaic includes the 73.5% of images with FWHM ≤ 1.″6. Each image's zero-point was matched to SDSS u, to account for transparency variations. Images with stellar ellipticity (1 − b/a) ≥ 0.08 were omitted. We find that the galaxy counts turn over at U_(AB) ∼ 25.75 mag in the best resolution mosaic and at ∼26 mag in the best depth mosaic. The EGS field is the final UVCANDELS field analyzed using the seeing-sorted stacking method.

Additional Information

© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received March 2022; Accepted March 2022; Published March 2022. We thank the LBT staff for their diligence in scheduling the LBT observations. The list of LBT partners is found here:http://abell.as.arizona.edu/~lbtsci/instruments.html. We acknowledge support from UVCANDELS grant HST-GO-15647 provided by NASA through the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-2655, and from NASA JWST Interdisciplinary Scientist grants NAG5-12460, NNX14AN10G and 80NSSC18K0200 from GSFC.

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