Galaxies in voids assemble their stars slowly

Jesús Domínguez-Gómez (), Isabel Pérez, Tomás Ruiz-Lara, Reynier F. Peletier, Patricia Sánchez-Blázquez, Ute Lisenfeld, Jesús Falcón-Barroso, Manuel Alcázar-Laynez, María Argudo-Fernández, Guillermo Blázquez-Calero, Hélène Courtois, Salvador Duarte Puertas, Daniel Espada, Estrella Florido, Rubén García-Benito, Andoni Jiménez, Kathryn Kreckel, Mónica Relaño, Laura Sánchez-Menguiano, Thijs Hulst, Rien Weygaert, Simon Verley and Almudena Zurita
Additional contact information
Jesús Domínguez-Gómez: Universidad de Granada
Isabel Pérez: Universidad de Granada
Tomás Ruiz-Lara: Universidad de Granada
Reynier F. Peletier: University of Groningen
Patricia Sánchez-Blázquez: Universidad Complutense de Madrid
Ute Lisenfeld: Universidad de Granada
Jesús Falcón-Barroso: Instituto de Astrofísica de Canarias
Manuel Alcázar-Laynez: Universidad de Granada
María Argudo-Fernández: Universidad de Granada
Guillermo Blázquez-Calero: Instituto de Astrofísica de Andalucía - CSIC
Hélène Courtois: Université Claude Bernard Lyon 1, IUF, IP2I Lyon
Salvador Duarte Puertas: Universidad de Granada
Daniel Espada: Universidad de Granada
Estrella Florido: Universidad de Granada
Rubén García-Benito: Instituto de Astrofísica de Andalucía - CSIC
Andoni Jiménez: Universidad de Granada
Kathryn Kreckel: Universität Heidelberg
Mónica Relaño: Universidad de Granada
Laura Sánchez-Menguiano: Universidad de Granada
Thijs Hulst: University of Groningen
Rien Weygaert: University of Groningen
Simon Verley: Universidad de Granada
Almudena Zurita: Universidad de Granada

Nature, 2023, vol. 619, issue 7969, 269-271

Abstract: Abstract Galaxies in the Universe are distributed in a web-like structure characterized by different large-scale environments: dense clusters, elongated filaments, sheetlike walls and under-dense regions, called voids1–5. The low density in voids is expected to affect the properties of their galaxies. Indeed, previous studies6–14 have shown that galaxies in voids are, on average, bluer and less massive, and have later morphologies and higher current star formation rates than galaxies in denser large-scale environments. However, it has never been observationally proved that the star formation histories (SFHs) in voids are substantially different from those in filaments, walls and clusters. Here we show that void galaxies have had, on average, slower SFHs than galaxies in denser large-scale environments. We also find two main SFH types present in all the environments: ‘short-timescale’ galaxies are not affected by their large-scale environment at early times but only later in their lives; ‘long-timescale’ galaxies have been continuously affected by their environment and stellar mass. Both types have evolved more slowly in voids than in filaments, walls and clusters.

Date: 2023
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DOI: 10.1038/s41586-023-06109-1

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