Star Formation and Dust in the Cosmic Web

PARENTE, MASSIMILIANO; RAGONE-FIGUEROA, C.; LOPEZ, P.; MARTÍNEZ J.; RUIZ, N.A.; CECCARELLI, L.; RODRIGUEZ, F.; GRANATO, G. L.; LAPI, ANDREA; VAN DE WEYGAERT, R.

ASTROPHYSICAL JOURNAL

IOP PUBLISHING LTD

Lugar: Londres; Año: 2024

0004-637X

The large-scale environment of the cosmic web is believed to impact galaxy evolution, but there is stillno consensus regarding the mechanisms. We use a semi-analytic model (SAM) galaxy catalog to studythe star formation and dust content of local galaxies in different cosmic environments of the cosmic web,namely voids, filaments, walls, and nodes. We find a strong impact of the environment only for galaxieswith Mstars ≲ 1010.8 M⊙: the less dense the environment, the larger the star formation rate and dustcontent at fixed stellar mass. This is attributed to the fact that galaxies in less dense environmentstypically feature younger stellar populations, a slower evolution of their stellar mass and a delayedstar formation compared to galaxies in denser environments. As for galaxies with Mstars ≳ 1010.8 M⊙ differences among environments are milder due to the disc instability (DI) driven supermassive black hole (SMBH) growth implemented in the SAM, which makes SMBH growth, and thus galaxy quenching, environment insensitive. We qualitatively test our predictions against observations by identifying environments in the SDSS-DR16 using dust masses derived from the GAMA survey. The agreement is encouraging, particularly at log Mstars/M⊙ ≳ 10.5 − 11, where sSFRs and dust masses appear quite environment-insensitive. This result confirms the importance of in situ growth channels of SMBHs.