Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/48858

Title

The spatial distributions of red and blue globular clusters in major dry merger remnants

Author(s)

Shin, Min-Su;  Kawata, Daisuke

Abstract

Using high-resolution N-body simulations, we examine whether a major dry merger mitigates the difference in the radial density distributions between red and blue globular clusters (GCs). To this end, we study the relation between the density slope of the GCs in merger progenitors and that in a merger remnant, when the density distribution is described by n GC vprop r –α. We also study how our results depend on the merger orbit and the size of the core radius of the initial GC density distribution. We find that a major dry merger makes the GC profile flatter, and the steeper initial GC profile leads to more significant flattening, especially if the initial slope is steeper than α ∼ 3.5. Our result suggests that if there is a major dry merger of elliptical galaxies whose red GCs have a steeper radial profile than the blue GCs, as currently observed, and their slopes are steeper than α ∼ 3.5, the difference in the slopes between the two populations becomes smaller after dry mergers. Therefore, the observed slopes of red and blue GCs can be a diagnostic of the importance of dry merger. The current observational data show that the red and blue GCs have more comparable and shallower slopes in some luminous galaxies, which may indicate that they have experienced dry mergers.

Publication type

Journal article

Research centre

Swinburne University of Technology

Source

Astrophysical Journal, Vol. 691, no. 1 (Jan 2009), pp. 83-90

Publication year

2009

FOR Code(s)

0201 Astronomical and Space Sciences;  020103 Cosmology and Extragalactic Astronomy

Keyword(s)

Colours;  Dark-matter;  Density;  Distributions;  Early-type galaxies;  Elliptical galaxies;  Evolution;  Fundamental plane;  Globular clusters;  Interacting galaxies;  Lenticular galaxies;  Massive elliptic galaxies;  Profile;  Simulations;  Star clusters;  Systems

Publisher

Institute of Physics Publishing

ISSN

0004-637X

Publisher URL

http://dx.doi.org/10.1088/0004-637x/691/1/83

Peer reviewed