| Title: |
The effect of local and large scale environment on the star formation histories of galaxies |
| Authors: |
Torres-Ríos, G., Pérez, I., Verley, S., Domínguez-Gómez, J., Argudo-Fernández, M., Puertas, S. Duarte, Jiménez, A., Ruiz-Lara, T., Zurita, A., Bidaran, B., Conrado, A., Espada, D., García-Benito, R., Delgado, R. M. González, Falcón-Barroso, J., Florido, E., Sánchez-Blázquez, P., Sánchez-Menguiano, L. |
| Source: |
A&A 691, A341 (2024) |
| Publication Year: |
2024 |
| Collection: |
Astrophysics |
| Subject Terms: |
Astrophysics - Astrophysics of Galaxies |
| More Details: |
We aim to investigate how the local environment influences the star formation history (SFH) of galaxies residing in various large-scale environments. We categorise a sample of 9384 galaxies into the three primary large scale structures (voids, walls \& filaments, and clusters) and further classify them based on their local environment (as either "singlets" or group members), through a search of companion galaxies within sky-projected distances $\Delta r_p < 0.45$ Mpc and velocity differences $\Delta v < 160$ $\text{km s}^{-1}$. Subsequently, we explore these subsamples through SFH data from previous works. Throughout the study, galaxies are divided into long-timescale SFH galaxies (LT-SFH), which assemble their mass steadily along cosmic time, and short-timescale SFH galaxies (ST-SFH), which form their stars early. We then compare characteristic mass assembly look-back times. The distributions of mass assembly look-back times in ST-SFH galaxies are statistically different for singlets and groups. These differences are only found in LT-SFH galaxies when studying these distributions in stellar mass bins. Our results indicate that the large-scale environment is related to a delay in mass assembly of up to $\sim$2 Gyr, while this delay is $<$1 Gyr in the case of local environment. The effect of both kinds of environment is more significant in less massive galaxies, and in LT-SFHs. Our results are consistent with galaxies in groups assembling their stellar mass earlier than singlets, especially in voids and lower mass galaxies. Local environment plays a relevant role in stellar mass assembly times, although we find that large-scale structures also cause a delay in mass assembly, more so in the case of cluster galaxies.
Comment: 7 pages, 4 figures. Accepted for publication in A&A |
| Document Type: |
Working Paper |
| DOI: |
10.1051/0004-6361/202450675 |
| Access URL: |
http://arxiv.org/abs/2410.00959 |
| Accession Number: |
edsarx.2410.00959 |
| Database: |
arXiv |
