Effects of chaos on the detectability of stellar streams

Mestre, Martín Federico; Llinares, Claudio; Carpintero, D. D.

doi:10.1093/mnras/stz3505

Cited by 19 publications

(13 citation statements)

References 81 publications

(82 reference statements)

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“…They explored different structural and kinematical properties and found that globular clusters behave similarly, independently of the presence of tidal tails or any other kind of extra-tidal feature, or the absence thereof. Recently, Mestre et al (2020) compared the behavior of simulated streams embedded in chaotic and non-chaotic regions of the phase-space. They find that typical gravitational potentials of host galaxies can sustain chaotic orbits, which in turn do reduce the time interval during which streams can be detected.…”

Section: Analysis and Discussionmentioning

confidence: 99%

DECam photometry reveals extra-tidal stars around the Milky Way globular cluster NGC 6864 (M75)

Piatti

2021

Preprint

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Globular clusters are prone to lose stars while moving around the Milky Way. These stars escape the clusters and are distributed throughout extended envelopes or tidal tails. However, such extra-tidal structures are not observed in all globular clusters, and yet there is no structural or dynamical parameters that can predict their presence or absence. NGC 6864 is an outer halo globular cluster with reported no observed tidal tails. We used Dark Energy Camera (DECam) photometry reaching ∼ 4 mag underneath its main sequence turnoff to confidently detect an extra-tidal envelope, and stellar debris spread across the cluster outskirts. These features emerged once robust field star filtering techniques were applied to the fainter end of the observed cluster main sequence. NGC 6864 is associated to the Gaia-Enceladus dwarf galaxy, among others 28 globular clusters. Up-to-date, nearly 64% of them have been targeted looking for tidal tails and most of them have been confirmed to exhibit tidal tails. Thus, the present outcomes allow us to speculate on the possibility that Gaia-Enceladus globular clusters share a common pattern of mass loss by tidal disruption.

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Section: Analysis and Discussionmentioning

confidence: 99%

DECam photometry reveals extra-tidal stars around the Milky Way globular cluster NGC 6864 (M75)

Piatti

2021

Preprint

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“…Chaos (or instabilities) inside the barred region may propagate over long time period and further relates with the formations of spiral arms or inner disc rings depending upon the bar strength (strong or weak) 10,25,30,33 . Now for model 1, orbits are escaping and chaotic with high MLE for initial point x 0 = 5, y 0 = 0, p x 0 = 15.…”

Section: Discussionmentioning

confidence: 99%

Role of galactic bars in the formation of spiral arms: a study through orbital and escape dynamics-II

Mondal¹,

Chattopadhyay²

2022

Preprint

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In the present work we have analysed the effect of dark matter haloes on the orbital and escape dynamics of stars in barred galaxies. For that, a three-dimensional gravitational model composed by central bulge, bar, disc and dark matter halo have been studied from the viewpoint of escape in an open Hamiltonian system. In addition this model is investigated for the following dark matter halo profiles viz. oblate and NFW. In both cases, escape mechanism has been observed near the saddle points corresponding to the bar ends.We visualise the nature of stellar orbits in the plane of the bar. Further Poincaré surface section maps in several phase planes for different escape energy values have been plotted to visualise the chaotic and regular domains of motion. Finally the variation of chaos with the dark matter halo parameters viz. mass, size, circular velocity and nature has been investigated. Our result shows that the oblate haloes are preferred to justify the formation of full-fledged spiral arms and extended dark matter distributions in the giant spirals than the NFW haloes, only if they host central super massive black holes (SMBHs). Again, in the absence of SMBHs, the oblate haloes well justify the formation of less prominent or poor spiral arms and dark matter dominated cores in the dwarf and LSB galaxies. We also found that, for the NFW haloes, extreme central baryonic feedback is required to form spiral patterns and such haloes should preferred for the galaxies with extremely energetic centres.

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“…Price-Whelan et al 2016a,b;Pérez-Villegas et al 2018). Recently, Mestre et al (2020) compared the behavior of simulated streams embedded in chaotic and non-chaotic regions of the phase-space. They find that typical gravitational potentials of host galaxies can sustain chaotic orbits, which in turn do reduce the time interval during which streams can be detected.…”

Section: Analysis and Discussionmentioning

confidence: 99%

The surroundings of the Milky Way globular cluster NGC 6809

Piatti

2021

Preprint

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We study the outer regions of the Milky Way globular cluster NGC 6809 based on Dark Energy Camera (DECam) observations, which reach nearly 6 mag below the cluster main sequence (MS) turnoff. In order to unveil its fainter outermost structure, we built stellar density maps using cluster MS stars, once the contamination of field stars was removed from the cluster color-magnitude diagram. We found that only the resulting stellar density map for the lightest stars exhibits some excesses of stars at opposite sides from the cluster centre that diminish soon thereafter at ∼ 0.32 • . Studied globular clusters with apogalactic distances smaller than that of NGC 6809 (5.5 kpc) do not have observed tidal tails. The lack of detection of tidal tails in the studied inner globular cluster sample could be due to the reduced diffusion time of tidal tails by the kinematically chaotic nature of the orbits of these globular clusters, thus shortening the time interval during which the tidal tails can be detected. Further investigations with an enlarged cluster sample are needed to confirm whether chaotic and non-chaotic orbits are responsible for the existence of globular clusters with tidal tails and those with extra-tidal features that are different from tidal tails or without any signatures of extended stellar density profiles.

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Effects of chaos on the detectability of stellar streams

Cited by 19 publications

References 81 publications

DECam photometry reveals extra-tidal stars around the Milky Way globular cluster NGC 6864 (M75)

DECam photometry reveals extra-tidal stars around the Milky Way globular cluster NGC 6864 (M75)

Role of galactic bars in the formation of spiral arms: a study through orbital and escape dynamics-II

The surroundings of the Milky Way globular cluster NGC 6809

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