A Possible Protocluster of Galaxies Serendipitously Discovered in the Field of an Intermediate-Redshift Post-starburst Galaxy
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arXiv
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| Format: | Preprint |
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2026
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| author | Knowlton, Mary C. Spilker, Justin S. Bezanson, Rachel D'Onofrio, Vincenzo R. Kumar, Anika Setton, David J. Suess, Katherine A. |
| author_facet | Knowlton, Mary C. Spilker, Justin S. Bezanson, Rachel D'Onofrio, Vincenzo R. Kumar, Anika Setton, David J. Suess, Katherine A. |
| contents | We present the serendipitous discovery of an overdensity of submillimeter galaxies (SMGs) in the field of SDSSJ0909-0108, a massive z~0.7 post-starburst galaxy from the SQuIGGLE survey. ALMA observations at 870um and 2mm reveal six galaxies within a 35'' region with flux ratios consistent with emission from dust. Given the rarity of 870um sources and the small field-of-view of ALMA, we speculate that some of these sources are physically associated. None of the sources are at the same redshift as the post-starburst, and four do not have spectroscopic redshifts. We suggest that follow-up optical and/or ALMA observations be carried out to measure redshifts for the galaxies in this potential protocluster environment. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_19651 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A Possible Protocluster of Galaxies Serendipitously Discovered in the Field of an Intermediate-Redshift Post-starburst Galaxy Knowlton, Mary C. Spilker, Justin S. Bezanson, Rachel D'Onofrio, Vincenzo R. Kumar, Anika Setton, David J. Suess, Katherine A. Astrophysics of Galaxies We present the serendipitous discovery of an overdensity of submillimeter galaxies (SMGs) in the field of SDSSJ0909-0108, a massive z~0.7 post-starburst galaxy from the SQuIGGLE survey. ALMA observations at 870um and 2mm reveal six galaxies within a 35'' region with flux ratios consistent with emission from dust. Given the rarity of 870um sources and the small field-of-view of ALMA, we speculate that some of these sources are physically associated. None of the sources are at the same redshift as the post-starburst, and four do not have spectroscopic redshifts. We suggest that follow-up optical and/or ALMA observations be carried out to measure redshifts for the galaxies in this potential protocluster environment. |
| title | A Possible Protocluster of Galaxies Serendipitously Discovered in the Field of an Intermediate-Redshift Post-starburst Galaxy |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2604.19651 |