Effects of chaos on the detectability of stellar streams

Author:

Mestre Martín12,Llinares Claudio34,Carpintero Daniel D12

Affiliation:

1. Instituto de Astrofísica de La Plata (CONICET-UNLP), B1900FWA, Argentina

2. Facultad de Ciencias Astronómicas y Geofísicas de La Plata (UNLP), B1900FWA, Argentina

3. Institute for Computational Cosmology, Department of Physics, Durham University, Durham DH1 3LE, UK

4. Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth PO1 3FX, UK

Abstract

ABSTRACT Observations show that stellar streams originating in satellite dwarf galaxies are frequent in the Universe. While such events are predicted by theory, it is not clear how many of the streams that are generated are washed out afterwards to the point in which it is impossible to detect them. Here, we study how these diffusion times are affected by the fact that typical gravitational potentials of the host galaxies can sustain chaotic orbits. We do this by comparing the behaviour of simulated stellar streams that reside in chaotic or non-chaotic regions of the phase space. We find that chaos does reduce the time interval in which streams can be detected. By analysing detectability criteria in configuration and velocity space, we find that the impact of these results on the observations depends on the quality of both the data and the underlying stellar halo model. For all the stellar streams, we obtain a similar upper limit to the detectable mass.

Funder

Science and Technology Facilities Council

European Research Council

Consejo Nacional de Investigaciones Científicas y Técnicas

Universidad Nacional de La Plata

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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