A dusty proto-cluster surrounding the binary galaxy HerBS-70 at $z = 2.3$
| Autor: | Bakx, Tom J. L. C., Berta, S., Dannerbauer, H., Cox, P., Butler, K. M., Hagimoto, M., Hughes, D. H., Riechers, D. A., van der Werf, P. P., Yang, C., Baker, A. J., Beelen, A., Bendo, G. J., Borsato, E., Buat, V., Cooray, A. R., Dunne, L., Dye, S., Eales, S., Gavazzi, R., Harris, A. I., Ismail, D., Ivison, R. J., Jones, B., Krips, M., Lehnert, M. D., Marchetti, L., Messias, H., Negrello, M., Neri, R., Omont, A., Perez-Fournon, I., Nanni, A., Chartab, N., Serjeant, S., Stanley, F., Tamura, Y., Urquhart, S. A., Vlahakis, C., Weiß, A., Young, A. J. |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | We report on deep SCUBA-2 observations at 850$\mu$m and NOEMA spectroscopic measurements at 2 mm of the environment surrounding the luminous, massive ($M_{*} \approx 2 \times 10^{11}$ M$_{\odot}$) Herschel-selected source HerBS-70. This source was revealed by previous NOEMA observations to be a binary system of dusty star-forming galaxies at $z= 2.3$, with the East component (HerBS-70E) hosting an Active Galactic Nucleus (AGN). The SCUBA-2 observations detected, in addition to the binary system, twenty-one sources at $> 3.5 \sigma$ over an area of $\sim 25$ square comoving Mpc with a sensitivity of $\sigma_{850} = 0.75$ mJy. The surface density of continuum sources around HerBS-70 is three times higher than for field galaxies. The NOEMA spectroscopic measurements confirm the protocluster membership of three of the nine brightest sources through their CO(4 - 3) line emission, yielding a volume density 36 times higher than for field galaxies. All five confirmed sub-mm galaxies in the HerBS-70 system have relatively short gas depletion times ($80 - 500$ Myr), indicating the onset of quenching for this protocluster core due to the depletion of gas. The dark matter halo mass of the HerBS-70 system is estimated around $5 \times{} 10^{13}$ M$_{\odot}$, with a projected current-day mass of $10^{15}$ M$_{\odot}$, similar to the local Virgo and Coma clusters. These observations support the claim that DSFGs, in particular the ones with observed multiplicity, can trace cosmic overdensities. Comment: 19 pages, 13 figures, accepted for publication in MNRAS |
| Databáze: | arXiv |
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