The BoRG-JWST Survey: Program Overview and First Confirmations of Luminous Reionization-Era Galaxies from Pure-Parallel Observations
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| Format: | Preprint |
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2024
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| author | Roberts-Borsani, Guido Bagley, Micaela Rojas-Ruiz, Sofía Treu, Tommaso Morishita, Takahiro Finkelstein, Steven L. Trenti, Michele Haro, Pablo Arrabal Bañados, Eduardo Ortiz, Óscar A. Chávez Chworowsky, Katherine Hutchison, Taylor A. Larson, Rebecca L. Leethochawalit, Nicha Leung, Gene C. K. Mason, Charlotte Somerville, Rachel S. Stiavelli, Massimo Yung, L. Y. Aaron Kassin, Susan A. Soto, Christian |
| author_facet | Roberts-Borsani, Guido Bagley, Micaela Rojas-Ruiz, Sofía Treu, Tommaso Morishita, Takahiro Finkelstein, Steven L. Trenti, Michele Haro, Pablo Arrabal Bañados, Eduardo Ortiz, Óscar A. Chávez Chworowsky, Katherine Hutchison, Taylor A. Larson, Rebecca L. Leethochawalit, Nicha Leung, Gene C. K. Mason, Charlotte Somerville, Rachel S. Stiavelli, Massimo Yung, L. Y. Aaron Kassin, Susan A. Soto, Christian |
| contents | We present the BoRG-JWST survey, a combination of two JWST Cycle 1 programs aimed at obtaining NIRSpec spectroscopy of representative, UV-bright $7<z<10$ galaxy candidates across 22 independent sight lines selected from Hubble/WFC3 pure-parallel observations. We confirm the high-$z$ nature of 10 out of 19 observed primary targets through low-resolution prism observations, with the rest revealing themselves unsurprisingly to be $z\sim1-3$ interlopers, brown dwarfs, or yielding inconclusive results. From the MSA observations, we confirm an additional 9 filler sources at $z>5$, highlighting the large abundance of high-redshift galaxies even in individual WFC3 pointings. The primary sample span an absolute magnitude range $-20.4<M_{\rm UV}<-22.4$ mag and harbour UV continuum slopes of $β\simeq-2.5$ to $-2.0$, representing some of the most luminous $z>7$ sources currently known and comparable to the brightest sources at $z>10$. Prominent [O III]+H$β$ lines are found across the full sample, while a stack of sources reveals a plethora of other rest-optical lines and additional rest-UV C III]1909 Å emission. Despite their luminosities, none of the low-resolution spectra display evidence for Type 1 AGN activity based on a search for broad-line emission. Lastly, we present a spectroscopic data release of 188 confirmed $0.5\lesssim z\lesssim5.0$ sources from filler MSA observations, highlighting the legacy value of the survey and a representative benchmark for comparisons to deep field observations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_17551 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The BoRG-JWST Survey: Program Overview and First Confirmations of Luminous Reionization-Era Galaxies from Pure-Parallel Observations Roberts-Borsani, Guido Bagley, Micaela Rojas-Ruiz, Sofía Treu, Tommaso Morishita, Takahiro Finkelstein, Steven L. Trenti, Michele Haro, Pablo Arrabal Bañados, Eduardo Ortiz, Óscar A. Chávez Chworowsky, Katherine Hutchison, Taylor A. Larson, Rebecca L. Leethochawalit, Nicha Leung, Gene C. K. Mason, Charlotte Somerville, Rachel S. Stiavelli, Massimo Yung, L. Y. Aaron Kassin, Susan A. Soto, Christian Astrophysics of Galaxies We present the BoRG-JWST survey, a combination of two JWST Cycle 1 programs aimed at obtaining NIRSpec spectroscopy of representative, UV-bright $7<z<10$ galaxy candidates across 22 independent sight lines selected from Hubble/WFC3 pure-parallel observations. We confirm the high-$z$ nature of 10 out of 19 observed primary targets through low-resolution prism observations, with the rest revealing themselves unsurprisingly to be $z\sim1-3$ interlopers, brown dwarfs, or yielding inconclusive results. From the MSA observations, we confirm an additional 9 filler sources at $z>5$, highlighting the large abundance of high-redshift galaxies even in individual WFC3 pointings. The primary sample span an absolute magnitude range $-20.4<M_{\rm UV}<-22.4$ mag and harbour UV continuum slopes of $β\simeq-2.5$ to $-2.0$, representing some of the most luminous $z>7$ sources currently known and comparable to the brightest sources at $z>10$. Prominent [O III]+H$β$ lines are found across the full sample, while a stack of sources reveals a plethora of other rest-optical lines and additional rest-UV C III]1909 Å emission. Despite their luminosities, none of the low-resolution spectra display evidence for Type 1 AGN activity based on a search for broad-line emission. Lastly, we present a spectroscopic data release of 188 confirmed $0.5\lesssim z\lesssim5.0$ sources from filler MSA observations, highlighting the legacy value of the survey and a representative benchmark for comparisons to deep field observations. |
| title | The BoRG-JWST Survey: Program Overview and First Confirmations of Luminous Reionization-Era Galaxies from Pure-Parallel Observations |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2407.17551 |