Advanced search
1 file | 2.01 MB

G2C2, II : integrated colour-metallicity relations for Galactic globular clusters in SDSS passbands

Author
Organization
Abstract
We use our integrated Sloan Digital Sky Survey (SDSS) photometry for 96 globular clusters in g and z, as well as r and i photometry for a subset of 56 clusters, to derive the integrated colour-metallicity relation (CMR) for Galactic globular clusters. We compare this relation to previous work, including extragalactic clusters, and examine the influence of age, present-day mass function variations, structural parameters and the morphology of the horizontal branch on the relation. Moreover, we scrutinize the scatter introduced by foreground extinction (including differential reddening) and show that the scatter in the CMR can be significantly reduced combining two reddening laws from the literature. In all CMRs, we find some low-reddening young GCs that are offset to the CMR. Most of these outliers are associated with the Sagittarius system. Simulations show that this is due to less age than to a different enrichment history. Finally, we introduce CMRs based on the infrared calcium triplet, which are clearly non-linear when compared to (g' - i') and (g' - z') colours.
Keywords
HUBBLE-SPACE-TELESCOPE, EARLY-TYPE GALAXIES, SAGITTARIUS DWARF GALAXY, RR LYRAE STARS, MILKY-WAY, HORIZONTAL-BRANCH, MAGNITUDE DIAGRAM, MASS FUNCTION, OPTICAL/NIR SURVEY, LOCAL GROUP, Galactic globular clusters

Downloads

  • Vanderbeke et al. 2014b.pdf
    • full text
    • |
    • open access
    • |
    • PDF
    • |
    • 2.01 MB

Citation

Please use this url to cite or link to this publication:

Chicago
Vanderbeke, Joachim, Michael J West, Roberto De Propris, Eric W Peng, John Blakeslee, Andrés Jordán, Patrick Côté, et al. 2014. “G2C2, II : Integrated Colour-metallicity Relations for Galactic Globular Clusters in SDSS Passbands.” Monthly Notices of the Royal Astronomical Society 437 (2): 1734–1749.
APA
Vanderbeke, J., West, M. J., De Propris, R., Peng, E. W., Blakeslee, J., Jordán, A., Côté, P., et al. (2014). G2C2, II : integrated colour-metallicity relations for Galactic globular clusters in SDSS passbands. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 437(2), 1734–1749.
Vancouver
1.
Vanderbeke J, West MJ, De Propris R, Peng EW, Blakeslee J, Jordán A, et al. G2C2, II : integrated colour-metallicity relations for Galactic globular clusters in SDSS passbands. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2014;437(2):1734–49.
MLA
Vanderbeke, Joachim, Michael J West, Roberto De Propris, et al. “G2C2, II : Integrated Colour-metallicity Relations for Galactic Globular Clusters in SDSS Passbands.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 437.2 (2014): 1734–1749. Print.
@article{4306375,
  abstract     = {We use our integrated Sloan Digital Sky Survey (SDSS) photometry for 96 globular clusters in g and z, as well as r and i photometry for a subset of 56 clusters, to derive the integrated colour-metallicity relation (CMR) for Galactic globular clusters. We compare this relation to previous work, including extragalactic clusters, and examine the influence of age, present-day mass function variations, structural parameters and the morphology of the horizontal branch on the relation. Moreover, we scrutinize the scatter introduced by foreground extinction (including differential reddening) and show that the scatter in the CMR can be significantly reduced combining two reddening laws from the literature. In all CMRs, we find some low-reddening young GCs that are offset to the CMR. Most of these outliers are associated with the Sagittarius system. Simulations show that this is due to less age than to a different enrichment history. Finally, we introduce CMRs based on the infrared calcium triplet, which are clearly non-linear when compared to (g' - i') and (g' - z') colours.},
  author       = {Vanderbeke, Joachim and West, Michael J and De Propris, Roberto and Peng, Eric W and Blakeslee, John and Jordán, Andrés and Côté, Patrick and Gregg, Michael and Ferrarese, Laura and Takamiya, Marianne and Baes, Maarten},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keywords     = {HUBBLE-SPACE-TELESCOPE,EARLY-TYPE GALAXIES,SAGITTARIUS DWARF GALAXY,RR LYRAE STARS,MILKY-WAY,HORIZONTAL-BRANCH,MAGNITUDE DIAGRAM,MASS FUNCTION,OPTICAL/NIR SURVEY,LOCAL GROUP,Galactic globular clusters},
  language     = {eng},
  number       = {2},
  pages        = {1734--1749},
  title        = {G2C2, II : integrated colour-metallicity relations for Galactic globular clusters in SDSS passbands},
  url          = {http://dx.doi.org/10.1093/mnras/stt2012},
  volume       = {437},
  year         = {2014},
}

Altmetric
View in Altmetric
Web of Science
Times cited: