Signs of environmental effects on star-forming galaxies in the Spiderweb protocluster at z = 2.16
Date Issued
2023
Author(s)
Pérez-Martínez, J. M.
•
Dannerbauer, H.
•
Kodama, T.
•
Koyama, Y.
•
Shimakawa, R.
•
Suzuki, T. L.
•
•
Chen, Z.
•
Daikuhara, K.
•
Hatch, N. A.
•
Laza-Ramos, A.
•
Sobral, D.
•
Stott, J. P.
•
Tanaka, I.
Abstract
We use multi-object near-infrared spectroscopy with VLT/KMOS to investigate the role of the environment in the evolution of the ionized gas properties of narrow-band-selected H α emitters (HAEs) in the Spiderweb protocluster at z = 2.16. Based on rest-frame optical emission lines, H α and [N II]λ6584, we confirm the cluster membership of 39 of our targets (i.e. 93 per cent success rate), and measure their star formation rates (SFR), gas-phase oxygen abundances, and effective radius. We parametrize the environment where our targets reside using local and global density indicators based on previous samples of spectroscopic and narrow-band cluster members. We find that star-forming galaxies embedded in the Spiderweb protocluster display SFRs compatible with those of the main sequence and morphologies comparable to those of late-type galaxies at z = 2.2 in the field. We also report a mild gas-phase metallicity enhancement (0.06 ± 0.03 dex) at intermediate stellar masses. Furthermore, we identify two UVJ-selected quiescent galaxies with residual H α-based star formation and find signs of extreme dust obscuration in a small sample of starbursty submillimetre galaxies based on their FIR and H α emission. Interestingly, the spatial distribution of these objects differs from the rest of HAEs, avoiding the protocluster core. Finally, we explore the gas fraction-gas metallicity diagram for seven galaxies with molecular gas masses measured by ATCA using CO(1-0). In the context of the gas-regulator model, our objects are consistent with relatively low mass-loading factors, suggesting lower outflow activity than field samples at the cosmic noon and thus, hinting at the onset of environmental effects in this massive protocluster.
Volume
518
Issue
2
Start page
1707
Issn Identifier
0035-8711
Ads BibCode
2023MNRAS.518.1707P
Rights
open.access
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