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Kinematic subpopulations in dwarf spheroidal galaxies

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Kinematic subpopulations in dwarf spheroidal galaxies. / Ural, Uğur; Wilkinson, Mark I.; Koch, Andreas et al.
In: Monthly Notices of the Royal Astronomical Society, Vol. 402, No. 2, 18.12.2009, p. 1357-1368.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Ural, U, Wilkinson, MI, Koch, A, Gilmore, G, Beers, TC, Belokurov, V, Wyn Evans, N, Grebel, EK, Vidrih, S & Zucker, DB 2009, 'Kinematic subpopulations in dwarf spheroidal galaxies', Monthly Notices of the Royal Astronomical Society, vol. 402, no. 2, pp. 1357-1368. https://doi.org/10.1111/j.1365-2966.2009.15975.x

APA

Ural, U., Wilkinson, M. I., Koch, A., Gilmore, G., Beers, T. C., Belokurov, V., Wyn Evans, N., Grebel, E. K., Vidrih, S., & Zucker, D. B. (2009). Kinematic subpopulations in dwarf spheroidal galaxies. Monthly Notices of the Royal Astronomical Society, 402(2), 1357-1368. https://doi.org/10.1111/j.1365-2966.2009.15975.x

Vancouver

Ural U, Wilkinson MI, Koch A, Gilmore G, Beers TC, Belokurov V et al. Kinematic subpopulations in dwarf spheroidal galaxies. Monthly Notices of the Royal Astronomical Society. 2009 Dec 18;402(2):1357-1368. doi: 10.1111/j.1365-2966.2009.15975.x

Author

Ural, Uğur ; Wilkinson, Mark I. ; Koch, Andreas et al. / Kinematic subpopulations in dwarf spheroidal galaxies. In: Monthly Notices of the Royal Astronomical Society. 2009 ; Vol. 402, No. 2. pp. 1357-1368.

Bibtex

@article{826d4feead3e47eb9f3f8a55624d5e54,
title = "Kinematic subpopulations in dwarf spheroidal galaxies",
abstract = "We present new spectroscopic data for 26 stars in the recently discovered Canes Venatici I (CVn I) dwarf spheroidal galaxy, obtained with the Gemini Multi-Object Spectrograph North (GMOS-N) on the Gemini North telescope. We use these data to investigate the recent claim of the presence of two dynamically inconsistent stellar populations in this system. While we find no evidence for kinematically distinct subpopulations in our sample, we also show that the available kinematic data set in CVnI is likely too small to draw robust conclusions about its subpopulations. We are, however, able to obtain a mass estimate for CVn I that is consistent with all available data, including previously published data. We discuss possible differences between our sample and the earlier data set, and study the general detectability of subpopulations in small kinematic samples. We conclude that, in the absence of additional supporting observational evidence (e.g. metallicity gradients), subpopulations in small kinematic samples (typically fewer than 100 stars) should be treated with caution, as their identification depends on multiple parameters and rarely produces a signal at a high confidence level. It is therefore essential to explicitly determine the statistical significance of any suggested subpopulation.",
author = "Uğur Ural and Wilkinson, {Mark I.} and Andreas Koch and Gerard Gilmore and Beers, {Timothy C.} and V. Belokurov and {Wyn Evans}, N. and E.K. Grebel and Simon Vidrih and Zucker, {D. B.}",
year = "2009",
month = dec,
day = "18",
doi = "10.1111/j.1365-2966.2009.15975.x",
language = "English",
volume = "402",
pages = "1357--1368",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "OXFORD UNIV PRESS",
number = "2",

}

RIS

TY - JOUR

T1 - Kinematic subpopulations in dwarf spheroidal galaxies

AU - Ural, Uğur

AU - Wilkinson, Mark I.

AU - Koch, Andreas

AU - Gilmore, Gerard

AU - Beers, Timothy C.

AU - Belokurov, V.

AU - Wyn Evans, N.

AU - Grebel, E.K.

AU - Vidrih, Simon

AU - Zucker, D. B.

PY - 2009/12/18

Y1 - 2009/12/18

N2 - We present new spectroscopic data for 26 stars in the recently discovered Canes Venatici I (CVn I) dwarf spheroidal galaxy, obtained with the Gemini Multi-Object Spectrograph North (GMOS-N) on the Gemini North telescope. We use these data to investigate the recent claim of the presence of two dynamically inconsistent stellar populations in this system. While we find no evidence for kinematically distinct subpopulations in our sample, we also show that the available kinematic data set in CVnI is likely too small to draw robust conclusions about its subpopulations. We are, however, able to obtain a mass estimate for CVn I that is consistent with all available data, including previously published data. We discuss possible differences between our sample and the earlier data set, and study the general detectability of subpopulations in small kinematic samples. We conclude that, in the absence of additional supporting observational evidence (e.g. metallicity gradients), subpopulations in small kinematic samples (typically fewer than 100 stars) should be treated with caution, as their identification depends on multiple parameters and rarely produces a signal at a high confidence level. It is therefore essential to explicitly determine the statistical significance of any suggested subpopulation.

AB - We present new spectroscopic data for 26 stars in the recently discovered Canes Venatici I (CVn I) dwarf spheroidal galaxy, obtained with the Gemini Multi-Object Spectrograph North (GMOS-N) on the Gemini North telescope. We use these data to investigate the recent claim of the presence of two dynamically inconsistent stellar populations in this system. While we find no evidence for kinematically distinct subpopulations in our sample, we also show that the available kinematic data set in CVnI is likely too small to draw robust conclusions about its subpopulations. We are, however, able to obtain a mass estimate for CVn I that is consistent with all available data, including previously published data. We discuss possible differences between our sample and the earlier data set, and study the general detectability of subpopulations in small kinematic samples. We conclude that, in the absence of additional supporting observational evidence (e.g. metallicity gradients), subpopulations in small kinematic samples (typically fewer than 100 stars) should be treated with caution, as their identification depends on multiple parameters and rarely produces a signal at a high confidence level. It is therefore essential to explicitly determine the statistical significance of any suggested subpopulation.

U2 - 10.1111/j.1365-2966.2009.15975.x

DO - 10.1111/j.1365-2966.2009.15975.x

M3 - Journal article

VL - 402

SP - 1357

EP - 1368

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 2

ER -