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The MUSE Ultra Deep Field (MUDF). III. Hubble Space Telescope WFC3 Grism Spectroscopy and Imaging

Revalski, Mitchell; Rafelski, Marc; Fumagalli, Michele; Fossati, Matteo; Pirzkal, Norbert; Sunnquist, Ben; Prichard, Laura J.; Henry, Alaina; Bagley, Micaela; Dutta, Rajeshwari; Papini, Giulia; Battaia, Fabrizio Arrigoni; D’Odorico, Valentina; Dayal, Pratika; Estrada-Carpenter, Vicente; Lofthouse, Emma K.; Lusso, Elisabeta; Morris, Simon L.; Nedkova, Kalina V.; Papovich, Casey; Peroux, Celine

The MUSE Ultra Deep Field (MUDF). III. Hubble Space Telescope WFC3 Grism Spectroscopy and Imaging Thumbnail


Mitchell Revalski

Marc Rafelski

Michele Fumagalli

Matteo Fossati

Norbert Pirzkal

Ben Sunnquist

Laura J. Prichard

Alaina Henry

Micaela Bagley

Rajeshwari Dutta

Giulia Papini

Fabrizio Arrigoni Battaia

Valentina D’Odorico

Pratika Dayal

Vicente Estrada-Carpenter

Emma K. Lofthouse

Elisabeta Lusso

Kalina V. Nedkova

Casey Papovich

Celine Peroux


We present extremely deep Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) observations of the MUSE Ultra Deep Field. This unique region of the sky contains two quasars at z ≈ 3.22 that are separated by only ∼500 kpc, providing a stereoscopic view of gas and galaxies in emission and absorption across ∼10 billion years of cosmic time. We have obtained 90 orbits of HST WFC3 G141 near-infrared grism spectroscopy of this field in a single pointing, as well as 142 hr of optical spectroscopy with the Very Large Telescope Multi Unit Spectroscopic Explorer (MUSE). The WFC3 (F140W, F125W, and F336W) and archival WFPC2 (F702W and F450W) imaging provides five-filter photometry that we use to detect 3375 sources between z ≈ 0–6, including 1536 objects in a deep central pointing with both spectroscopic and photometric coverage. The F140W and F336W mosaics reach exceptional depths of mAB ≈ 28 and 29, respectively, providing near-infrared and rest-frame ultraviolet information for 1580 sources, and we reach 5σ continuum detections for objects as faint as mAB ≈ 27 in the grism spectra. The extensive wavelength coverage of MUSE and WFC3 allows us to measure spectroscopic redshifts for 419 sources, down to galaxy stellar masses of log(M/M⊙) ≈7 at z ≈ 1–2. In this publication, we provide the calibrated HST data and source catalogs as High Level Science Products for use by the community, which includes photometry, morphology, and redshift measurements that enable a variety of studies aimed at advancing our models of galaxy formation and evolution in different environments.


Revalski, M., Rafelski, M., Fumagalli, M., Fossati, M., Pirzkal, N., Sunnquist, B., …Peroux, C. (2023). The MUSE Ultra Deep Field (MUDF). III. Hubble Space Telescope WFC3 Grism Spectroscopy and Imaging. Astrophysical Journal Supplement, 265(2), Article 40.

Journal Article Type Article
Acceptance Date Feb 1, 2023
Online Publication Date Mar 16, 2023
Publication Date 2023-04
Deposit Date May 30, 2023
Publicly Available Date May 30, 2023
Journal The Astrophysical Journal Supplement Series
Print ISSN 0067-0049
Electronic ISSN 1538-4365
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 265
Issue 2
Article Number 40


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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.

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