Globular Clusters in the Galactic Bulge

Bica, E.; Ortolani, S.; Barbuy, B.

doi:10.1017/pasa.2015.47

Cited by 88 publications

(97 citation statements)

References 120 publications

(211 reference statements)

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“…The distinction between halo/disc and bulge GC candidates is supported by their estimated metallicities. As can be seen, MW bulge GCs are more metal-rich objects in comparison to those placed in the MW halo/disc (Minniti 1995;Côté 1999;Bica et al 2016). The present GC candidates spatial distribution is more consistent with their physical nature as MW bulge GCs -except those located out of the bulge -than that that comes from considering the heliocentric distances estimated by M17.…”

Section: Analysis and Discussionsupporting

confidence: 71%

On the physical nature of globular cluster candidates in the Milky Way bulge

Piatti

2018

Monthly Notices of the Royal Astronomical Society

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We present results from 2MASS JK s photometry on the physical reality of recently reported globular cluster (GC) candidates in the Milky Way (MW) bulge. We relied our analysis on photometric membership probabilities that allowed us to distinguish real stellar aggregates from the composite field star population. When building colourmagnitude diagrams and stellar density maps for stars at different membership probability levels, the genuine GC candidate populations are clearly highlighted. We then used the tip of the red giant branch (RGB) as distance estimator, resulting heliocentric distances that place many of the objects in regions near of the MW bulge where no GC had been previously recognised. Some few GC candidates resulted to be MW halo/disc objects. Metallicities estimated from the standard RGB method are in agreement with the values expected according to the position of the GC candidates in the Galaxy. Finally, we derived from the first time their structural parameters. We found that the studied objects have core, half-light and tidal radii in the ranges spanned by the population of known MW GCs. Their internal dynamical evolutionary stages will be described properly when their masses are estimated.

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Section: Analysis and Discussionsupporting

confidence: 71%

On the physical nature of globular cluster candidates in the Milky Way bulge

Piatti

2018

Monthly Notices of the Royal Astronomical Society

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“…In fact, the simulated star clusters and star cluster escapers have a slightly higher value of the velocity dispersion ( 110-150 km s −1 ) than the observed bulge cluster system ( 80-100 km s −1 ). On a side note, we found much better agreement between the velocity dispersion profiles if we also included in our sample of bulge clusters the objects that have been excluded by Bica et al (2016) as suspected halo intruders. Finally, the radial velocity and velocity dispersion profiles of our simulations are in good agreement with the data for the old spheroidal component identified in the Galactic bulge ( fig.…”

Section: The Datamentioning

confidence: 64%

“…The catalogue compiled by Harris (Harris 1996, 2010 edition) contains data on the kinematic, photometric, and dynamical properties of 157 objects classified as globular clusters in the Galaxy. More recently Bica, Ortolani & Barbuy (2016) presented a catalogue of candidate genuine bulge clusters. In this work, we consider the sample of candidate bulge clusters included within the inner 4.5 kpc of the Galaxy, excluding the probable halo intruders identified by the authors.…”

Section: The Datamentioning

confidence: 99%

The impact of an evolving bar on the kinematics of a primordial hot population of star clusters in the bulge

Rossi

Hurley

Ortolani

2018

Monthly Notices of the Royal Astronomical Society

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We present a numerical study of the effect of an evolving bar on the kinematics of a primordial hot star cluster population in the bulge, as well as on bulge field stars originating within dissolved star clusters. We confirm that an evolving bar is able to transfer a small amount of angular momentum to the star cluster system, in good agreement with observations for Galactic bulge clusters. In the case of a realistic mass model, in which the bar slows down and grows in size, the star cluster escapers evolve in a configuration consistent with that expected for a classical bulge and share comparable kinematic properties with the spheroidal metal-poor component identified within the bulge of the Milky Way. Our results are consistent with a scenario in which the bulge of the Milky Way has a composite nature, with the star clusters belonging and contributing to a primordial pressure-supported component.

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“…The consideration of the thin plus thick disk in the process is needed, recalling that Snaith et al (2014) proposed that the thick disk stellar population would involve as much mass as the thin disc. Bica et al (2016) select a sample of globular clusters, and report their properties: metallicity, reddening, space velocity, distance, and abundances. Nataf (2016b) reviews bulge reddening derivation from different indicators, which have implications on distances.…”

Section: Morphology and Simulationsmentioning

confidence: 99%

The Galactic Bulge

Barbuy

2016

Publ. Astron. Soc. Aust.

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The Galactic bulge is the least studied component of our Galaxy. Yet, its formation and evolution are key to understand the formation of the Galaxy itself. Studies on the Galactic bulge have increased significantly in the last years, but still there are many points of controversy. This volume contains several contributions from experts in different aspects of the bulge. Issues discussed include the following: the presence of an old spheroidal bulge, or identification of its old stellar population with the thick disk or halo; fraction of stars younger than 10 Gyr is estimated to be of < 5 to 22% depending on method and authors; multiple populations or only a metal-poor and a metal-rich ones; spheroidal or ellipsoidal distribution of RR Lyrae; formation of the bulge from early mergers or from secular evolution of the bar; different methods of mapping extinction; selection and identification of bulge globular clusters.

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Globular Clusters in the Galactic Bulge

Cited by 88 publications

References 120 publications

On the physical nature of globular cluster candidates in the Milky Way bulge

On the physical nature of globular cluster candidates in the Milky Way bulge

The impact of an evolving bar on the kinematics of a primordial hot population of star clusters in the bulge

The Galactic Bulge

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