Self-consistent simulations of nuclear cluster formation through globular cluster orbital decay and merging

Capuzzo–Dolcetta, R.; Miocchi, P.

doi:10.1111/j.1745-3933.2008.00501.x

Cited by 83 publications

(53 citation statements)

References 31 publications

(47 reference statements)

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“…This size appears to be obtained by the simulations regardless of the presence or absence of a central massive black hole (CapuzzoDolcetta 1993;Capuzzo-Dolcetta & Miocchi 2008;CapuzzoDolcetta & Mastrobuono-Battisti 2009;Antonini et al 2012;Antonini 2014).…”

Section: Introductionmentioning

confidence: 66%

Discovery of Rr Lyrae Stars in the Nuclear Bulge of the Milky Way

Minniti

Ramos

Zoccali

et al. 2016

ApJL

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Galactic nuclei, such as that of the Milky Way, are extreme regions with high stellar densities, and in most cases, the hosts of a supermassive black hole. One of the scenarios proposed for the formation of the Galactic nucleus is merging of primordial globular clusters. An implication of this model is that this region should host stars that are characteristically found in old Milky Way globular clusters. RR Lyrae stars are primary distance indicators, well known representatives of old and metal-poor stellar populations, and therefore are regularly found in globular clusters. Here we report the discovery of a dozen RR Lyrae type ab stars in the vicinity of the Galactic center, i.e., in the so-called nuclear stellar bulge of the Milky Way. This discovery provides the first direct observational evidence that the Galactic nuclear stellar bulge contains ancient stars (>10 Gyr old). Based on this we conclude that merging globular clusters likely contributed to the build-up of the high stellar density in the nuclear stellar bulge of the Milky Way.

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Section: Introductionmentioning

confidence: 66%

Discovery of Rr Lyrae Stars in the Nuclear Bulge of the Milky Way

Minniti

Ramos

Zoccali

et al. 2016

ApJL

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“…Our model supports the view that gas can be fed to such small radii to fuel ongoing episodic star formation (Pfuhl et al 2011). Though it is clear that the merger of globular clusters at the centre is a plausible process for growing nuclear star clusters (Tremaine, Ostriker & Spitzer 1975;Capuzzo-Dolcetta 1993;Capuzzo-Dolcetta & Miocchi 2008;Antonini et al 2012;Antonini 2013;Gnedin, Ostriker & Tremaine 2014), helping explain some kinematic kinematic anomalies, (Hartmann et al 2011;De Lorenzi et al 2013), it is likely that insitu star formation plays a more significant role.…”

Section: Implications For Nuclear Star Clustersmentioning

confidence: 99%

The formation of stellar nuclear discs in bar-induced gas inflows

Cole

Debattista

Erwin

et al. 2014

Monthly Notices of the Royal Astronomical Society

123

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The role of gas in the mass assembly at the nuclei of galaxies is still subject to some uncertainty. Stellar nuclear discs bridge the gap between the large-scale galaxy and the central massive objects that reside there. Using a high resolution simulation of a galaxy forming out of gas cooling and settling into a disc, we study the formation and properties of nuclear discs. Gas, driven to the centre by a bar, settles into a rotating star-forming nuclear disc (ND). This ND is thinner, younger, kinematically cooler, and more metal-rich than the surrounding bar. The ND is elliptical and orthogonal to the bar. The complex kinematics in the region of the ND are a result of the superposition of older stars streaming along the bar and younger stars circulating within the ND. The signature of the ND is therefore subtle in the kinematics. Instead the ND stands out clearly in metallicity and age maps. We compare the model to the density and kinematics of real galaxies with NDs finding qualitative similarities. Our results suggest that gas dissipation is very important for forming nuclear structures.

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“…It is tempting to speculate that the stellar nuclei are the merger products of globular clusters (GCs) by dynamical friction (e.g., Tremaine et al 1975;Oh & Lin 2000;Lotz et al 2001;Capuzzo-Dolcetta & Miocchi 2008;Agarwal & Milosavljević 2010). The VCC 1422, VCC 856, VCC 1087, VCC 1545, VCC 1407, and VCC 1539's stellar nuclei clearly show comparatively larger sizes than that of their GCs within them (Fig.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

The Properties of the Stellar Nuclei With the Host Galaxy Morphology in the Acsvcs

Lee

2011

Journal of The Korean Astronomical Society

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We have revisited the ACS Virgo Cluster Survey (ACSVCS), a Hubble Space Telescope program to obtain ACS/WFC g and z bands imaging for a sample of 100 early-type galaxies in the Virgo Cluster. In this study, we examine 51 nucleated early-type galaxies in the ACSVCS in order to look into the relationship between the photometric and structural properties of stellar nuclei and their host galaxies. We morphologically dissect galaxies into five classes. We note that (1) the stellar nuclei of dwarf earlytype galaxies (dS0, dE, and dE,N) are generally fainter and bluer with g > 18.95 and (g − z) < 1.40 compared to some brighter and redder counterparts of the ellipticals (E) and lenticular galaxies (S0), (2) the g-band half-light radii of stellar nuclei of all dwarf early-type galaxies (dS0, dE, and dE,N) are smaller than 20 pc and their average is about 4 pc, and (3) the colors of red stellar nuclei with (g − z) > 1.40 in bright ellipticals and lenticular galaxies are bluer than their host galaxies colors. We also show that most of the unusually "red" stellar nuclei with (g − z) > 1.54 in the ACSVCS are the central parts of bright ellipticals and lenticular galaxies. Furthermore, we present multi photometric band color -color plots that can be used to break the age-metallicity degeneracy particularly by inclusion of the thermally pulsing-asymptotic giant branch (TP-AGB) phases of stellar evolution in the stellar population models.

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Self-consistent simulations of nuclear cluster formation through globular cluster orbital decay and merging

Cited by 83 publications

References 31 publications

Discovery of Rr Lyrae Stars in the Nuclear Bulge of the Milky Way

Discovery of Rr Lyrae Stars in the Nuclear Bulge of the Milky Way

The formation of stellar nuclear discs in bar-induced gas inflows

The Properties of the Stellar Nuclei With the Host Galaxy Morphology in the Acsvcs

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