Signatures of star streams in the phase space distribution of nearby halo stars

TL;DR

This study analyzes the phase space distribution of nearby low-metallicity stars to identify star streams, recovering known streams and discovering three new potential halo streams in the Milky Way.

Contribution

It introduces a method to detect star streams in phase space, revealing three new halo streams among local stars.

Findings

Recovered all known thick disk star streams

Identified four significant phase space overdensities among halo stars

Discovered three novel halo star streams

Abstract

We have analyzed the phase space distribution of a sample of about 900 non--kinematically selected low metallicity stars in the solar vicinity. The stars primarily represent the thick disk and halo populations of the Milky Way. We aim to identify overdensely populated regions in phase space, which we interpret as signatures of star streams passing close to the Sun. The search was conducted in a space constructed from the angular momenta and eccentricities of the stellar orbits. Besides recovering all well known star streams in the thick disk, we isolated four statistically significant phase space overdensities amongst halo stars. One of them is associated with a previously known halo star stream, but three of them are novel features, which we propose be also considered as genuine halo streams.