Toward First-Principle Simulations of Galaxy Formation: II. Shock-Induced Starburst at a Collision Interface During the First Encounter of Interacting Galaxies

Takayuki R. Saitoh; Hiroshi Daisaka; Eiichiro Kokubo; Junichiro Makino; Takashi Okamoto; Kohji Tomisaka; Keiichi Wada; Naoki Yoshida

doi:10.1093/pasj/61.3.481

paper

Toward First-Principle Simulations of Galaxy Formation: II. Shock-Induced Starburst at a Collision Interface During the First Encounter of Interacting Galaxies

arXiv:0805.0167 · doi:10.1093/pasj/61.3.481

Abstract

We investigated the evolution of interacting disk galaxies using high-resolution $N$ -body/SPH simulations, taking into account the multiphase nature of the interstellar medium (ISM). In our high-resolution simulations, a large-scale starburst occurred naturally at the collision interface between two gas disks at the first encounter, resulting in the formation of star clusters. This is consistent with observations of interacting galaxies. The probability distribution function (PDF) of gas density showed clear change during the galaxy-galaxy encounter. The compression of gas at the collision interface between the gas disks first appears as an excess at $n_{H} \sim 10 c m^{- 3}$ in the PDF, and then the excess moves to higher densities ( $n_{H} ≳ 100 c m^{- 3}$ ) in a few times $1 0^{7}$ years where starburst takes place. After the starburst, the PDF goes back to the quasi-steady state. These results give a simple picture of starburst phenomena in galaxy-galaxy encounters.

6 pages, 6 figures, accepted to PASJ. For high resolution figures, see http://www.cfca.nao.ac.jp/~saitoh/Papers/2009/Saitoh+2009a.pdf

Toward First-Principle Simulations of Galaxy Formation: II. Shock-Induced Starburst at a Collision Interface During the First Encounter of Interacting Galaxies

Abstract

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