Using Gaia DR2 to detect extratidal structures around the Galactic globular cluster NGC 362

Carballo‐Bello, J. A.

doi:10.1093/mnras/stz962

Cited by 18 publications

(7 citation statements)

References 49 publications

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“…During the last few years, deep enough wide-sky photometric surveys have allowed to explore the outermost regions of a number of globular clusters, which resulted in the detection of a variety of extra-tidal structures around them. For instance, tidal tails have been very recently identified in NGC 362 (Carballo-Bello 2019), NGC 1851, NGC 2808(Carballo-Bello et al 2018Sollima 2020), 4590 (Palau & Miralda-Escudé 2019), 5139 (Ibata et al 2019), 5904 (Grillmair 2019), among others. These globular clusters are now enlarging the list of nearly 15 globular clusters with detected tidal tails (e.g., Pal 5; Odenkirchen et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Signatures of tidal disruption in the Milky Way globular cluster NGC 6981 (M72)

Piatti

Mestre

Carballo‐Bello

et al. 2021

A&A

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We study the outer regions of the Milky Way globular cluster NGC 6981 based on publicly available BV photometry and new Dark Energy Camera (DECam) observations, both of which reach nearly 4 mag below the cluster main sequence (MS) turnoff. While the BV data sets reveal the present of extra-tidal features around the cluster, the much larger field of view of the DECam observations allowed us to identify some other tidal features, which extend from the cluster toward the opposite direction to the Milky Way center. Such structural features of clusters arise from stellar density maps built using MS stars, following a cleaning of the cluster color-magnitude diagram to remove the contamination of field stars. We also performed N-body simulations in order to help us to understand the spatial distribution of the extra-tidal debris. The outcomes reveal the presence of long trailing and leading tails that are mostly parallel to the direction of the cluster velocity vector. We find that the cluster loses most of its mass by tidal disruption during its perigalactic passages, each of which lasted nearly 20 Myr. Hence, a decrease in the density of escaping stars near the cluster is expected from our N-body simulations, which, in turn, means that stronger extra-tidal features could be found by exploring much larger areas around NGC 6891.

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Section: Introductionmentioning

confidence: 99%

Signatures of tidal disruption in the Milky Way globular cluster NGC 6981 (M72)

Piatti

Mestre

Carballo‐Bello

et al. 2021

A&A

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“…A number of extant star clusters have been found to have extratidal features or streams associated with them (e.g., Odenkirchen et al 2001;Belokurov et al 2006;Olszewski et al 2009;Kuzma et al 2018;Palau & Miralda-Escudé 2019;Carballo-Bello 2019).…”

Section: Introductionmentioning

confidence: 99%

The GALAH Survey: Chemically tagging the Fimbulthul stream to the globular cluster ω Centauri

Simpson

Martell

Costa

et al. 2019

Monthly Notices of the Royal Astronomical Society

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Using kinematics from Gaia and the large elemental abundance space of the second data release of the GALAH survey, we identify two new members of the Fimbulthul stellar stream, and chemically tag them to massive, multi-metallic globular cluster ω Centauri. Recent analysis of the second data release of Gaia had revealed the Fimbulthul stellar stream in the halo of the Milky Way. It had been proposed that the stream is associated with the ω Cen, but this proposition relied exclusively upon the kinematics and metallicities of the stars to make the association. In this work, we find our two new members of the stream to be metal-poor stars that are enhanced in sodium and aluminium, typical of second population globular cluster stars, but not otherwise seen in field stars. Furthermore, the stars share the s-process abundance pattern seen in ω Cen, which is rare in field stars. Apart from one star within 1.5 deg of ω Cen, we find no other stars observed by GALAH spatially near ω Cen or the Fimbulthul stream that could be kinematically and chemically linked to the cluster. Chemically tagging stars in the Fimbulthul stream to ω Cen confirms the earlier work, and further links this tidal feature in the Milky Way halo to ω Cen.

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“…As with many problems in near-field astrophysics, the availability of Gaia astrometry has led to a slew of new discoveries in this area of research, with many globular clusters now known to possess long (but generally extremely faint) tidal tails (e.g., Carballo-Bello 2019;Carballo-Bello et al 2020;Kaderali et al 2019;Sollima 2020;Ibata et al 2019bIbata et al ,a, 2021Palau & Miralda-Escudé 2021;Bonaca et al 2021;Kuzma et al 2021). However, Gaia studies are typically limited to relatively nearby clusters such that traditional groundbased wide-field imaging surveys are still useful for exploring more distant systems.…”

Section: Introductionmentioning

confidence: 99%

A search for stellar structures around nine outer halo globular clusters in the Milky Way

Zhang,

Mackey,

Da Costa

2021

Preprint

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We use deep imaging from the Dark Energy Camera to explore the peripheral regions of nine globular clusters in the outer halo of the Milky Way. Apart from Whiting 1 and NGC 7492, which are projected against the Sagittarius stream, we see no evidence for adjacent stellar populations to indicate any of these clusters is associated with coherent tidal debris from a destroyed host dwarf. We also find no evidence for tidal tails around any of the clusters in our sample; however, both NGC 1904 and 6981 appear to possess outer envelopes. Motivated by a slew of recent Gaia-based discoveries, we compile a sample of clusters with robust detections of extra-tidal structure, and search for correlations with orbital properties. While we observe that clusters with tidal tails are typically on moderately or very eccentric orbits that are highly inclined to the Galactic plane and often retrograde, these are neither necessary nor sufficient conditions for the formation of extra-tidal structure. That many objects with tidal tails appear to be accreted leads us to speculate that this lack of consistency may stem from the inhomogeneous dynamical history of the Milky Way globular cluster system. Finally, we note that clusters with prominent stellar envelopes detected in ground-based imaging (such as NGC 1851 and 7089) are now all known from Gaia to possess long tidal tails -experimental confirmation that the presence of an extended envelope is indicative of tidal erosion.

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Using Gaia DR2 to detect extratidal structures around the Galactic globular cluster NGC 362

Cited by 18 publications

References 49 publications

Signatures of tidal disruption in the Milky Way globular cluster NGC 6981 (M72)

Signatures of tidal disruption in the Milky Way globular cluster NGC 6981 (M72)

The GALAH Survey: Chemically tagging the Fimbulthul stream to the globular cluster ω Centauri

A search for stellar structures around nine outer halo globular clusters in the Milky Way

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