Lack of influence of the environment in the earliest stages of massive galaxy formation



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Annunziatella, Marianna and Pérez González, Pablo Guillermo and García Argumánez, Ángela and Barro, Guillermo and Alcalde Pampliega, Belén and Constantin, Luca and Koekemoer, Anton M. and Mérida, Rosa M. (2022) Lack of influence of the environment in the earliest stages of massive galaxy formation. Monthly notices of The Royal Astronomical Society, 519 (1). pp. 1476-1493. ISSN 0035-8711

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We investigate how the environment affects the assembly history of massive galaxies. For that purpose, we make use of SHARDS and HST spectro-photometric data, whose depth, spectral resolution, and wavelength coverage allow to perform a detailed analysis of the stellar emission as well as obtaining unprecedentedly accurate photometric redshifts. This expedites a sufficiently accurate estimate of the local environment and a robust derivation of the star formation histories of a complete sample of 332 massive galaxies (> 10^(10)Mꙩ) at redshift 1 ≤ z ≤ 1.5 in the GOODS-N field. We find that massive galaxies in this redshift range avoid the lowest density environments. Moreover, we observed that the oldest galaxies in our sample with with mass-weighted formation redshift z_(M−w) ≥ 2.5, avoid the highest density regions, preferring intermediate environments. Younger galaxies, including those with active star formation, tend to live in denser environments (Σ = 5.0^(24.8)_(1.1) × 10^(10)MꙩMpc^(−2)). This behavior could be expected if those massive galaxies starting their formation first would merge with neighbors and sweep their environment earlier. On the other hand, galaxies formed more recently (z_(M−w) < 2.5) are accreted into large scale structures at later times and we are observing them before sweeping their environment or, alternatively, they are less likely to affect their environment. However, given that both number and mass surface densities of neighbor galaxies is relatively low for the oldest galaxies, our results reveal a very weak correlation between environment and the first formation stages of the earliest massive galaxies.

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© 2022 The Author(s). MA acknowledges financial support from Comunidad de Madrid under Atracción de Talento grant 2020-T2/TIC19971. MA and PGPG acknowledge support from Spanish Ministerio de Ciencia, Innovación y Universidades through grant PGC2018-093499-B-I00. A. García-Argumánez acknowledges the support of the Universidad Complutense de Madrid through the predoctoral grant CT17/17-CT18/17. This work has made use of the Rainbow Cosmological Surveys Database, which is operated by the Centro de Astrobiología (CAB/INTA), partnered with the University of California Observatories at Santa Cruz (UCO/Lick,UCSC).

Uncontrolled Keywords:Star-formation histories; Similar-to 2; Stellar mass; Quiescent galaxies; Photometric redshifts; Spectroscopic survey; Assembly histories; Forming galaxies; Dark-matter; Evolution
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:77951
Deposited On:11 May 2023 12:05
Last Modified:11 May 2023 12:05

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