The HST-Hyperion Survey: Grism Observations of a <i>z</i> ∼ 2.5 Protosupercluster
Abstract We present the first results and catalogs from the HST-Hyperion survey. This survey has collected 50 orbits of WFC3/F160W imaging and WFC3/G141 grism spectroscopy in the most overdense regions of the Hyperion protosupercluster at z ∼ 2.45, which are analyzed in conjunction with the adjacent 56 orbits of WFC3/F140W imaging and WFC3/G141 grism spectroscopy from the 3D-HST survey. Sources were identified and spectra were extracted using grizli , which subsequently fit the combined grism data with object-matched photometric data from the COSMOS2020 catalog to obtain a redshift and best-fit spectral model. Each source was then visually inspected by multiple team members and quality flags were assigned. A total of 12,814 objects with m HST ≤ 25.0 were inspected, of which 5629 (44%) have reliable redshifts from the grism data and are sensitive to emission lines at a level of ∼8.8 × 10 −18 erg s −1 cm −2 (1 σ ). A comparison with high-quality, ground-based spectroscopic redshifts yields a scatter of σ NMAD = 0.0016. The resulting catalogs contain 125 confirmed members of the Hyperion structure within 2.40 < z < 2.53, with an additional 71 confirmed galaxies in projection within 2.35 < z < 2.65. The redshift, stellar population, and line flux catalogs, as well as all grism spectra, are publicly available.
Authors
- Priti Staab (ORCID: https://orcid.org/0000-0002-8877-4320)
- Denise Hung (ORCID: https://orcid.org/0000-0001-7523-140X)
- Lu Shen (ORCID: https://orcid.org/0000-0001-9495-7759)
- Ben Forrest (ORCID: https://orcid.org/0000-0001-6003-0541)
- S. Bardelli (ORCID: https://orcid.org/0000-0002-8900-0298)
- O. Cucciati (ORCID: https://orcid.org/0000-0002-9336-7551)
- Ekta A. Shah (ORCID: https://orcid.org/0000-0001-7811-9042)
- Kaila Ronayne (ORCID: https://orcid.org/0000-0001-5749-5452)
- E. Zucca (ORCID: https://orcid.org/0000-0002-5845-8132)
- Nimish P. Hathi (ORCID: https://orcid.org/0000-0001-6145-5090)
- Russell E. Ryan (ORCID: https://orcid.org/0000-0003-0894-1588)
- G. Zamorani (ORCID: https://orcid.org/0000-0002-2318-301X)
- Lori M. Lubin (ORCID: https://orcid.org/0000-0003-2119-8151)
- R. R. Gal (ORCID: https://orcid.org/0000-0001-8255-6560)
- Debora Pelliccia (ORCID: https://orcid.org/0000-0002-3007-0013)
- B. Garilli (ORCID: https://orcid.org/0000-0001-7455-8750)
- Emmet Golden-Marx (ORCID: https://orcid.org/0000-0001-5160-6713)
- R. Amorín (ORCID: https://orcid.org/0000-0001-5758-1000)
- Weida Hu (ORCID: https://orcid.org/0000-0003-3424-3230)
- Finn Giddings (ORCID: https://orcid.org/0009-0003-2158-1246)
- B. C. Lemaux (ORCID: https://orcid.org/0000-0002-1428-7036)
- Derek Sikorski (ORCID: https://orcid.org/0000-0001-5796-2807)
Publication Details
- Journal
- The Astrophysical Journal
- Published
- 2025-05-14
- DOI
- https://doi.org/10.3847/1538-4357/adc252
- Citations
- 4
- Primary Topic
- Stellar, planetary, and galactic studies
- Type
- article
- Field-Weighted Citation Impact
- 4.62
Funders
- National Aeronautics and Space Administration
- Space Telescope Science Institute