The effect of local and large scale environment on the star formation histories of galaxies

Abstract

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.

7 pages, 4 figures. Accepted for publication in A&A

References in corpus (18)

• Array Programming with NumPy
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
• Galaxy Pairs in the Sloan Digital Sky Survey I: Star Formation, AGN Fraction, and the Luminosity/Mass-Metallicity Relation
• UV-extended E-MILES stellar population models: young components in massive early-type galaxies
• Catalogues of isolated galaxies, isolated pairs, and isolated triplets in the local Universe
• Physical properties of SDSS satellite galaxies in projected phase-space
• Galaxy evolution across environments as probed by the ages, stellar metallicities and [alpha/Fe] of central and satellite galaxies
• Galaxies in voids assemble their stars slowly
• Revealing the properties of void galaxies and their assembly using the EAGLE simulation
• Void Galaxies Follow a Distinct Evolutionary Path in the Environmental COntext Catalog
• Properties of brightest group galaxies in cosmic web filaments
• Local and large-scale effects on the astrophysics of void-galaxies
• The Global Environment of Small Galaxy Systems
• On the nature of Small Galaxy Systems
• Hickson-like compact groups inhabiting different environments
• Understanding the role of morphology and environment on the dynamical evolution of isolated galaxy triplets

Cited by in corpus (1)

• Traces of the evolution of cosmic void galaxies: An Integral Field Spectroscopy based analysis