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The Mass–Metallicity Relation at Cosmic Noon in Overdense Environments: First Results from the MAMMOTH–Grism HST Slitless Spectroscopic Survey

Wang, Xin and Li, Zihao and Cai, Zheng and Shi, Dong Dong and Fan, Xiaohui and Zheng, Xian Zhong and Bian, Fuyan and Teplitz, Harry I. and Alavi, Anahita and Colbert, James and Henry, Alaina L. and Malkan, Matthew A. (2022) The Mass–Metallicity Relation at Cosmic Noon in Overdense Environments: First Results from the MAMMOTH–Grism HST Slitless Spectroscopic Survey. Astrophysical Journal, 926 (1). Art. No. 70. ISSN 0004-637X. doi:10.3847/1538-4357/ac3974.

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The MAMMOTH–Grism slitless spectroscopic survey is a Hubble Space Telescope (HST) cycle 28 medium program, which is obtaining 45 orbits of WFC3/IR grism spectroscopy in the density peak regions of three massive galaxy protoclusters at z = 2–3 discovered using the MAMMOTH technique. We introduce this survey by presenting the first measurement of the mass–metallicity relation (MZR) at high redshift in overdense environments via grism spectroscopy. From the completed MAMMOTH–Grism observations in the field of the BOSS1244 protocluster at z = 2.24 ± 0.02, we secure a sample of 36 protocluster member galaxies at z ≈ 2.24, showing strong nebular emission lines ([O III], Hβ, and [O II]) in their G141 spectra. Using the multi-wavelength broadband deep imaging from HST and ground-based telescopes, we measure their stellar masses in the range of [10⁹, 10^(10.4)] M_⊙, instantaneous star formation rates (SFR) from 10 to 240 M_⊙ yr⁻¹, and global gas-phase metallicities [1/3, 1] of solar. Compared with similarly selected field-galaxy samples at the same redshift, our galaxies show, on average, increased SFRs by ∼0.06 dex and ∼0.18 dex at ∼10^(10.1) M_⊙ and ∼10^(9.8) M_⊙, respectively. Using the stacked spectra of our sample galaxies, we derive the MZR in the BOSS1244 protocluster core as 12 + log(O/H) = (0.136 ± 0.018) × log (M_★/M_⊙) + (7.082 ± 0.175), showing a significantly shallower slope than that in the field. This shallow MZR slope is likely caused by the combined effects of efficient recycling of feedback-driven winds and cold-mode gas accretion in protocluster environments. The former effect helps low-mass galaxies residing in overdensities retain their metal production, whereas the latter effect dilutes the metal content of high-mass galaxies, making them more metal-poor than their coeval field counterparts.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Wang, Xin0000-0002-9373-3865
Li, Zihao0000-0001-5951-459X
Cai, Zheng0000-0001-8467-6478
Shi, Dong Dong0000-0002-3264-819X
Fan, Xiaohui0000-0003-3310-0131
Zheng, Xian Zhong0000-0003-3728-9912
Bian, Fuyan0000-0002-1620-0897
Teplitz, Harry I.0000-0002-7064-5424
Alavi, Anahita0000-0002-8630-6435
Colbert, James0000-0001-6482-3020
Henry, Alaina L.0000-0002-6586-4446
Malkan, Matthew A.0000-0001-6919-1237
Additional Information:© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2021 August 13; revised 2021 October 26; accepted 2021 November 11; published 2022 February 15. We thank the anonymous referee for a careful read and useful comments that helped improve the clarity of this paper. This work is supported by NASA through HST grant HST-GO-16276. We acknowledge the technical support from Tricia Royle and Norbert Pirzkal in scheduling our observations. X.W. is greatly indebted to Gabriel Brammer for his help in designing the observing strategy of this grism program, and his guidance in reducing the grism data. X.W. thanks Adam Carnall, Ranga-Ram Chary, Tucker Jones, and Ryan Sanders for useful discussion. D.D.S. and X.Z.Z. thank the support from the National Science Foundation of China (11773076 and 12073078), the National Key Research and Development Program of China (2017YFA0402703), and the science research grants from the China Manned Space Project with NO. CMS-CSST-2021-A02, CMS-CSST-2021-A04, and CMS-CSST-2021-A07. Facilities: HST (WFC3) - , LBT (LBC) - , CFHT (WIRCam). - Software: SExtractor (Bertin & Arnouts 1996), Grizli (Brammer & Matharu 2021), BAGPIPES (Carnall et al. 2018), AstroDrizzle (Hack et al. 2021), T-PHOT (Merlin et al. 2016), LMFIT (Newville et al. 2021), Emcee (Foreman-Mackey et al. 2013).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
National Natural Science Foundation of China11773076
National Natural Science Foundation of China12073078
National Key Research and Development Program of China2017YFA0402703
China Manned Space ProjectCMS-CSST-2021-A02
China Manned Space ProjectCMS-CSST-2021-A04
China Manned Space ProjectCMS-CSST-2021-A07
Subject Keywords:Protoclusters; Galaxy evolution; Galaxy abundances; Galaxy formation; High-redshift galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:20211214-190056620
Persistent URL:
Official Citation:Xin Wang et al 2022 ApJ 926 70
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:112428
Deposited By: George Porter
Deposited On:15 Dec 2021 03:04
Last Modified:22 Feb 2022 19:30

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