Research

Working on a galaxy formation model that includes cosmic environment.

Feb
2013

How cosmic web detachment drives galaxy quenching.

Posted by Miguel Aragon

In this study we present a new idea on star formation quenching. We followed the logical conclusion based on previous studies that show that galaxies form stars by accretion streams of cold gas. This happened in at a time when the Universe was dinamically young. So what happens to the feeding gas streams when galaxies enter non-linear regions? they detach from their parent galaxy and the galaxy basically starves, ending its star-formation phase.

Read paper
Feb
2013

A geometrical origin of the color-density relation.

Posted by Miguel Aragon

Would it be possible that a galaxy's stellar population is determined in part by its surrounding large-scale geometry? if so what would be the origin of this effect? In this paper (work in progress) we show evidence that points to geometry as an important factor as a regulator of star formation: galaxies that are located deep inside dense regions are surrounded by other galaxies that deplete the available gas around the galaxy, providing a natural mechanism for quenching that is independent of internal processes such as feedback.

Read paper
Feb
2013

The Multum in Parvo (MIP) simulation.

Posted by Miguel Aragon

The MIP simulation is a special kind of ensemble simulation in which all realizations share the same large-scale structure features. A simple way of describing this is as a "parallel universe simulation". The key of the MIP is generating initial conditions that are correlated above a given scale, this ensures that each realization contains the same cosmic web structures defined by a unique halo/galaxy population. The MIP can be used to study statistics of halo properties in cosmic environments where conventional simulations fail such as the interior or voids and walls.

Read the paper

Keywords