Jamie Keen
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on the atlas · 2
- The search for extratidal star candidates around Galactic globular clusters NGC 2808, NGC 6266, and NGC 6397 with Gaia DR2 astrometry | Astronomy & Astrophysics (A&A)1 savers
- Does NGC 6397 contain an intermediate-mass black hole or a more diffuse inner subcluster? | Astronomy & Astrophysics (A&A)1 savers
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lusters. Each cluster was explored in an annulus disk from the tidal radius up to five times the tidal radii. The significance level of the number of selected extratidal stars was determined on the basis of the distribution of Milky Way stars according to the Besançon Galaxy model and Gaia data. To understand the observed ext
The search for extratidal star candidates around Galactic globular clusters NGC 2808, NGC 6266, and NGC 6397 with Gaia DR2 astrometry | Astronomy & Astrophysics (A&A)be the final step of the life of massive stars (≳10 M⊙) after their final gravitational collapse into stellar-mass black holes, with masses in between ∼3 M⊙ (Thompson et al. 2020) and ≈52 M⊙ (Woosley 2017), but also when Hoyle & Fowler (1963) identified the then recently discovered quasars (Schmidt 1963) as SMBHs. This latter class of BHs, which reside in the centers of massive galaxies, are responsible for extremely luminous sources i
Does NGC 6397 contain an intermediate-mass black hole or a more diffuse inner subcluster? | Astronomy & Astrophysics (A&A)MAMPOSST-PM Bayesian mass-modeling code, along with updated estimates of the surface density profile of NGC 6397. We consider different priors on velocity anisotropy and on the size of the central mass, and we also separate the stars into components of different mean mass to allow for mass segregation. The velocity ellipsoid is very isotropic throughout the cluster, as expected in post-core collapsed clusters subject to as strong a Galactic tidal field as NGC 6397. There is strong evidence for a central dark component of 0.8 to 2% of the total
Does NGC 6397 contain an intermediate-mass black hole or a more diffuse inner subcluster? | Astronomy & Astrophysics (A&A)