Exploring the Outskirts of Globular Clusters: The Peculiar Kinematics of NGC 3201

Bianchini, P.; Ibata, Rodrigo; Famaey, Benoît

doi:10.3847/2041-8213/ab58d1

Cited by 45 publications

(29 citation statements)

References 61 publications

(70 reference statements)

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“…Since the pioneering work of Leon et al (2000), an ever-increasing list of globular clusters have been found to possess tidal tails (e.g., Odenkirchen et al 2001;Ibata et al 2019a;Palau & Miralda-Escudé 2019;Bianchini et al 2019;Thomas et al 2020;Sollima 2020). The present work reveals that at least 11 clusters have exceedingly long tidal tails with numerous member stars measured with exquisite astrometric precision in the Gaia DR2 and EDR3 catalogs.…”

Section: Discussionsupporting

confidence: 53%

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Charting the Galactic acceleration field I. A search for stellar streams with Gaia DR2 and EDR3 with follow-up from ESPaDOnS and UVES

Ibata,

Malhan,

Martin

et al. 2020

Preprint

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We present maps of the stellar streams detected in the Gaia Data Release 2 (DR2) and Early Data Release 3 (EDR3) catalogs using the STREAMFINDER algorithm. We also report the spectroscopic follow-up of the brighter DR2 stream members obtained with the high-resolution CFHT/ESPaDOnS and VLT/UVES spectrographs as well as with the medium-resolution NTT/EFOSC2 spectrograph. Three new stellar streams that do not have a clear progenitor are detected in DR2 (named Hríd, Víd and Gunnthrá), and seven are detected in EDR3 (named Gaia-6 to Gaia-12). Several candidate streams are also identified. The software finds very long tidal tails associated with the globular clusters

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Section: Discussionsupporting

confidence: 53%

“…NGC 3201 is also a low-latitude globular cluster that is suffering tidal stripping (Bianchini et al 2019). The STREAMFINDER is able to identify a 12 • -long feature in the immediate vicinity of the cluster, as we show in Figure 12.…”

Section: Ngc 3201 and Gjöllmentioning

confidence: 99%

Charting the Galactic acceleration field I. A search for stellar streams with Gaia DR2 and EDR3 with follow-up from ESPaDOnS and UVES

Ibata,

Malhan,

Martin

et al. 2020

Preprint

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“…It could be possible that some remnant of the DM halo is still preserved in the peripheries of present-day GCs (e.g. see Heggie & Hut 1996;Baumgardt et al 2009;Lane et al 2010;Conroy et al 2011;Ibata et al 2013;Penarrubia et al 2017;Bianchini et al 2019).…”

Section: Introductionmentioning

confidence: 99%

The First Billion Years project: Finding infant globular clusters at z = 6

Phipps

Khochfar

Varri

et al. 2020

A&A

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Aims. We aim to conduct an assessment of the demographics of substructures in cosmological simulations to identify low-mass stellar systems at high redshift, with a particular focus on globular cluster (GC) candidates. Methods. We explored a suite of high-resolution cosmological simulations from the First Billion Years Project (FiBY) at z ≥ 6. All substructures within the simulations have been identified with the SUBFIND algorithm. From our analysis, two distinct groups of objects emerge. We hypothesise that the substructures in the first group, which appear to have a high baryon fraction (fb ≥ 0.95), are possible infant GC candidates. Objects belonging to the second group have a high stellar fraction (f* ≥ 0.95) and show a potential resemblance to infant ultra-faint dwarf galaxies. Results. The high baryon fraction objects identified in this study are characterised by a stellar content similar to the one observed in present-day GCs, but they still contain a high gas fraction (fgas ∼ 0.95) and a relatively low amount of dark matter. They are compact systems, with densities higher than the average population of FiBY systems at the same stellar mass. Their sizes are consistent with recent estimates based on the first observations of possible proto-GCs at high redshifts. These types of infant GC candidates appear to be more massive and more abundant in massive host galaxies, indicating that the assembly of galaxies via mergers may play an important role in building several GC-host scaling relations. Specifically, we express the relation between the mass of the most massive infant GC and its host stellar mass as log(Mcl) = (0.31 ± 0.15) log (M*, gal + (4.17 ± 1.06). We also report a new relation between the most massive infant GC and the parent specific star formation rate of the form log(Mcl) = (0.85 ± 0.30) log (sSFR)+α that describes the data at both low and high redshift. Finally, we assess the present-day GC mass (GC number) – halo mass relation offers a satisfactory description of the behaviour of our infant GC candidates at high redshift, suggesting that such a relation may be set at formation.

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“…As we are searching for outlying stars that belong to the cluster, the proper motion for the cluster and extended structure components are assumed to be identical. This is a reasonable assumption since the proper motion should not vary significantly over the area on the sky that we are exploring (e.g., Bovy et al 2016;Bianchini et al 2019). We also fit the dispersion of the MW contaminant and cluster components.…”

Section: The Methodsmentioning

confidence: 99%

Detecting globular cluster tidal extensions with Bayesian inference – I. Analysis of ω Centauri with Gaia EDR3

Kuzma

Ferguson

Peñarrubia

2021

Monthly Notices of the Royal Astronomical Society

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The peripheral regions of globular clusters (GCs) are extremely challenging to study due to their low surface brightness nature and the dominance of Milky Way contaminant populations along their sightlines. We have developed a probabilistic approach to this problem through utilising a mixture model in spatial and proper motion space which separately models the cluster, extra-tidal and contaminant stellar populations. We demonstrate the efficacy of our method through application to Gaia EDR3 photometry and astrometry in the direction of NGC 5139 (ω Cen), a highly challenging target on account of its Galactic latitude (b ≈ 15○) and low proper motion contrast with the surrounding field. We recover the spectacular tidal extensions, spanning the 10○ on the sky explored here, seen in earlier work and quantify the star count profile and ellipticity of the system out to a cluster-centric radius of 4○. We show that both RR Lyrae and blue horizontal branch stars consistent with belonging to ω Cen are found in the tidal tails, and calculate that these extensions contain at least ≈0.1 per cent of the total stellar mass in the system. Our high probability members provide prime targets for future spectroscopic studies of ω Cen out to unprecedented radii.

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Exploring the Outskirts of Globular Clusters: The Peculiar Kinematics of NGC 3201

Cited by 45 publications

References 61 publications

Charting the Galactic acceleration field I. A search for stellar streams with Gaia DR2 and EDR3 with follow-up from ESPaDOnS and UVES

Charting the Galactic acceleration field I. A search for stellar streams with Gaia DR2 and EDR3 with follow-up from ESPaDOnS and UVES

The First Billion Years project: Finding infant globular clusters at z = 6

Detecting globular cluster tidal extensions with Bayesian inference – I. Analysis of ω Centauri with Gaia EDR3

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