3D-DASH: The Widest Near-infrared Hubble Space Telescope Survey

Lamiya A. Mowla, Sam E. Cutler, Gabriel B. Brammer, Ivelina G. Momcheva, Katherine E. Whitaker, Pieter G. Van Dokkum, Rachel S. Bezanson, Natascha M. Förster Schreiber, Marijn Franx, Kartheik G. Iyer, Danilo Marchesini, Adam Muzzin, Erica J. Nelson, Rosalind E. Skelton, Gregory F. Snyder, David A. Wake, Stijn Wuyts, Arjen Van Der Wel

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The 3D-Drift And SHift(3D-DASH) program is a Hubble Space Telescope(HST) WFC3 F160W imaging and G141 grism survey of the equatorial COSMOS field. 3D-DASH extends the legacy of HST near-infrared imaging and spectroscopy to degree-scale swaths of the sky, enabling the identification and study of distant galaxies(z > 2) that are rare or in short-lived phases of galaxy evolution at rest-frame optical wavelengths. Furthermore, when combined with existing ACS/F814W imaging, the program facilitates spatially resolved studies of the stellar populations and dust content of intermediate redshift(0.5 < z < 2) galaxies. Here we present the reduced F160W imaging mosaic available to the community. Observed with the efficient DASH technique, the mosaic comprises 1256 individual WFC3 pointings, corresponding to an area of 1.35 deg2(1.43 deg2 in 1912 when including archival data). The median 5σ point-source limit in H 160 is 24.74 ± 0.20 mag. We also provide a point-spread function(PSF) generator tool to determine the PSF at any location within the 3D-DASH footprint. 3D-DASH is the widest HST/WFC3 imaging survey in the F160W filter to date, increasing the existing extragalactic survey area in the near-infrared at HST resolution by an order of magnitude.

Original languageEnglish
Article number129
JournalThe Astrophysical Journal
Issue number2
Early online date8 Jul 2022
Publication statusPublished - 10 Jul 2022

Bibliographical note

Funding Information:
This paper is based on observations made with the NASA/ESA HST, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. Support from NASA STScI grants HST-GO-14114, HST-GO-16259, and HST-GO-16443 is gratefully acknowledged. L.M. and K.I. gratefully acknowledge support from the Dunlap Institute for Astronomy and Astrophysics through the Dunlap Postdoctoral Fellowship. The Dunlap Institute is funded through an endowment established by the David Dunlap family and the University of Toronto S.C. and K.W. wish to acknowledge funding from the Alfred P. Sloan Foundation and HST-AR-15027. K.W. acknowledge support under NASA grant No. 80NSSC20K0416. The Cosmic Dawn Center is funded by the Danish National Research Foundation under grant No. 140.

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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