G2C2 – I. Homogeneous photometry for Galactic globular clusters in SDSS passbands

Vanderbeke, Joachim; West, Michael J.; Propris, Roberto De; Peng, Eric W.; Blakeslee, John P.; Jordán, Andrés; Côté, Patrick; Gregg, Michael D.; Ferrarese, Laura; Takamiya, M.; Baes, M.

doi:10.1093/mnras/stt2002

Cited by 11 publications

(8 citation statements)

References 37 publications

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“…Our CMDs are derived from data observed with small groundbased telescopes (both Sloan Digital Sky Survey (SDSS) and Cerro Tololo Inter-American Observatory (CTIO) 0.9m telescope), as presented in Vanderbeke et al (2014a). Therefore, these suffer from incompleteness, especially close to the cluster centre.…”

Section: Sample Selection and Methodologymentioning

confidence: 99%

“…Here we use our Galactic Globular Cluster Catalog (G2C2) photometry (Vanderbeke et al 2014a,b, see Vanderbeke et al 2015, in preparation, for a discussion of the colour-magnitude diagrams of all clusters in the G2C2 sample) to address this issue. Our large and homogeneous photometry is sufficiently deep that we can trace the HB to the level of the main sequence turnoff in almost all clusters and allow us to study the radial distributions of stars at distances beyond several core radii from the cluster centre in many instances (the CTIO FOV is 13.6 on the side and has a resolution of 0.396 per pixel).…”

Section: Introductionmentioning

confidence: 99%

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G2C2 – IV. A novel approach to study the radial distributions of multiple populations in Galactic globular clusters

Vanderbeke

Propris

Rijcke

et al. 2015

Monthly Notices of the Royal Astronomical Society

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We use the HB morphology of 48 Galactic GCs to study the radial distributions of the different stellar populations known to exist in globular clusters. Assuming that the (extremely) blue HB stars correspond to stars enriched in Helium and light elements, we compare the radial distributions of stars selected according to colour on the HB to trace the distribution of the secondary stellar populations in globular clusters. Unlike other cases, our data show that the populations are well mixed in 80% of the cases studied. This provides some constraints on the mechanisms proposed to pollute the interstellar medium in young globular clusters.

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Section: Sample Selection and Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

G2C2 – IV. A novel approach to study the radial distributions of multiple populations in Galactic globular clusters

Vanderbeke

Propris

Rijcke

et al. 2015

Monthly Notices of the Royal Astronomical Society

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“…Because they dominate the SSS population in the galaxy core, we focus in particular on GCs, making use of statistical decontamination of background sources. To have a better statistics for the background subtraction, we used the entire VEGAS-SSS catalog of g and i matched sources (∼47 000 objects), and selected good GC candidate sources a) in the color range for 0.4 ≤ (g−i) ≤ 1.25 mag (e.g., Faifer et al 2011;Kartha et al 2014;Vanderbeke et al 2014); b) maximum photometric error Δ(g−i) = 0.15 mag for color analysis (Δm g = 0.5 mag for magnitude analysis); c) SExtractor star-galaxy CS ≥ 0.2, to avoid contamination from sources that are trivial background galaxies; d) and m g ≥ 18 mag, that is, sources ∼4 σ TOM brighter than m TOM g…”

Section: Gc Population Properties As a Function Of Galactocentric Dismentioning

confidence: 99%

VEGAS-SSS. A VST early-type galaxy survey: analysis of small stellar systems

Cantiello¹,

Capaccioli

Napolitano

et al. 2015

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We present a study of globular clusters (GCs) and other small stellar systems (SSSs) in the field of NGC 3115, observed as part of the ongoing wide-field imaging survey VEGAS, carried out with the 2.6 m VST telescope. We used deep g and i observations of NGC 3115, a well-studied lenticular galaxy that is covered excellently well in the scientific literature. This is fundamental to test the methodologies, verify the results, and probe the capabilities of the VEGAS-SSS. Leveraging the large field of view of the VST allowed us to accurately study the distribution and properties of SSSs as a function of galactocentric distance, well beyond ∼20 galaxy effective radii, in a way that is rarely possible. Our analysis of colors, magnitudes, and sizes of SSS candidates confirms the results from existing studies, some of which were carried out with 8-10 m class telescopes, and further extends them to previously unreached galactocentric distances with similar accuracy. In particular, we find a color bimodality for the GC population and a de Vaucouleurs r 1/4 profile for the surface density of GCs similar to the galaxy light profile. The radial color gradient of blue and red GCs previously found, for instance, by the SLUGGS survey with Subaru and Keck data, is further extended out to the largest galactocentric radii inspected, ∼65 kpc. In addition, the surface density profiles of blue and red GCs taken separately are well approximated by a r 1/4 density profile, with the fraction of blue GCs being slightly larger at larger radii. We do not find hints of a trend for the red GC subpopulation and for the GC turnover magnitude to vary with radius, but we observe a ∼0.2 mag difference in the turnover magnitude of the blue and red GC subpopulations. Finally, from inspecting SSS sizes and colors, we obtain a list of ultracompact dwarf galaxies and GC candidates suitable for future spectroscopic follow-up. In conclusion, our study shows i) the reliability of the methodologies developed to study SSSs in the field of bright early-type galaxies; and ii) the great potential of the VEGAS survey to produce original results on SSSs science, mainly thanks to the wide-field imaging adopted.

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“…Previous measurements of the total magnitudes of Galactic globular clusters were either based on aperture photometry (e.g. Hanes & Brodie 1985;Peterson 1986;Vanderbeke et al 2014) or were derived by integrating the surface brightness profile of a cluster (e.g. McLaughlin & van der Marel 2005).…”

Section: Introductionmentioning

confidence: 99%

Absolute -band magnitudes and mass-to-light ratios of Galactic globular clusters

Baumgardt

Sollima

Hilker

2020

Publ. Astron. Soc. Aust.

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We have used Hubble Space Telescope and ground-based photometry to determine total V-band magnitudes and mass-to-light ratios of more than 150 Galactic globular clusters. We do this by summing up the magnitudes of their individual member stars, using colour-magnitude information, Gaia DR2 proper motions, and radial velocities to distinguish cluster stars from background stars. Our new magnitudes confirm literature estimates for bright clusters with $V<8$ , but can deviate by up to two magnitudes from literature values for fainter clusters. They lead to absolute mass-to-light ratios that are confined to the narrow range $1.4<M/L_V<2.5$ , significantly smaller than what was found before. We also find a correlation between a cluster’s $M/L_V$ value and its age, in agreement with theoretical predictions. The $M/L_V$ ratios of globular clusters are also in good agreement with those predicted by stellar isochrones, arguing against a significant amount of dark matter inside globular clusters. We finally find that, in agreement with what has been seen in M 31, the magnitude distribution of outer halo globular clusters has a tail towards faint clusters that is absent in the inner parts of the Milky Way.

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G2C2 – I. Homogeneous photometry for Galactic globular clusters in SDSS passbands

Cited by 11 publications

References 37 publications

G2C2 – IV. A novel approach to study the radial distributions of multiple populations in Galactic globular clusters

G2C2 – IV. A novel approach to study the radial distributions of multiple populations in Galactic globular clusters

VEGAS-SSS. A VST early-type galaxy survey: analysis of small stellar systems

Absolute -band magnitudes and mass-to-light ratios of Galactic globular clusters

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