Two Distinct Ancient Components in the Sculptor Dwarf Spheroidal Galaxy: First Results from the Dwarf Abundances and Radial Velocities Team

By E. Tolstoy, M. Irwin, A. Helmi, G. Battaglia, P. Jablonka, V. Hill, K. Venn, M. Shetrone, B. Letarte, A. Cole and 7 more. 2004

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Subfields: Astronomy and Astrophysics, Instrumentation

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Citations in the corpus

Exploring Halo Substructure with Giant Stars. XI. The Tidal Tails of the Carina Dwarf Spheroidal Galaxy and the Discovery of Magellanic Cloud Stars in the Carina Foreground (2006, background): “…have provided RVs of hundreds of dwarf members to beyond 0.75rlim in several systems (Mateo 1997; Kleyna et al. 2002, 2004; Wilkinson et al. 2004; Tolstoy et al. 2004; Westfall et al. 2006; Muñoz et al. 2005; Walker et al. 2005; Sohn et al. 2006), we are apparently no closer to a consensus view…”
The Observed Properties of Dark Matter on Small Spatial Scales (2007, background): “It can be shown, however, that younger and/ormoremetal-rich populations aremore centrally concentrated (e.g., Harbeck et al. 2001) and that these populations also tend to exhibit lower velocity dispersions (Tolstoy et al. 2004).”
MULTI-ELEMENT ABUNDANCE MEASUREMENTS FROM MEDIUM-RESOLUTION SPECTRA. III. METALLICITY DISTRIBUTIONS OF MILKY WAY DWARF SATELLITE GALAXIES (2010, background): “Tolstoy et al. (2004) recognized this possibility in their finding of two distinct kinematic and metallicity components in Sculptor.”
Redefining the Missing Satellites Problem (2007, background): “Some dSphs show evidence for multiple, dynamically distinct stellar populations, with each population described by its own surface density and velocity dispersion (Harbeck et al. 2001; Tolstoy et al. 2004; Westfall et al. 2006; McConnachie et al. 2006; Ibata et al. 2006).”
Dark matter cores and cusps: the case of multiple stellar populations in dwarf spheroidals (2011, background): “The last decade has also seen the growing real- ⋆ E-mail: amorisco@ast.cam.ac.uk,nwe@ast.cam.ac.uk ization that the stellar content of dSphs is complex (e.g., Majewski et al. 1999; Kleyna et al. 2004; Tolstoy et al. 2004; Koch et al. 2008; Battaglia et al. 2008a; Ural et al. 2010).”
The Kinematic Status and Mass Content of the Sculptor Dwarf Spheroidal Galaxy (2008, background): “…of metallicity ([Fe/H]) and kinematic information have unveiled the presence of multiple stellar components in the Sculptor (Scl) and Fornax dSphs (Tolstoy et al. 2004, hereafter T04; Battaglia et al. 2006), where the metal rich (MR) stars have a more centrally concentrated, less extended spatial…”
Analysis and calibration of CaII triplet spectroscopy of red giant branch stars from VLT/FLAMES observations (2007, methodology): “11 shows the CaT [Fe/H] derived from the T01 calibration (equation 14), which we used in Tolstoy et al. (2004), Battaglia et al. (2006) and Helmi et al. (2006).”
Resolving the Formation of Protogalaxies. III. Feedback from the First Stars (2007, background): “A subset of dwarf galaxies, dwarf spheroidals (dSph), have the highest mass-to-light ratios (de Blok & McGaugh 1997; Mateo 1998) and contain a population of metal-poor stars that are similar to Galactic halo stars (Tolstoy et al. 2004; Helmi et al. 2006).”
STELLAR VELOCITIES IN THE CARINA, FORNAX, SCULPTOR, AND SEXTANS dSph GALAXIES: DATA FROM THE MAGELLAN/MMFS SURVEY (2008, methodology): “…an extra dimension of information that can be used to study stellar metallicity distributions (e.g., Koch et al. 2006, 2007b) to identify correlations between kinematics and metallicity (Tolstoy et al. 2004; Battaglia et al. 2006), and to help clean samples of contaminating foreground stars.”
Detailed abundances of a large sample of giant stars in M 54 and in the Sagittarius nucleus (2010, methodology): “For Sculptor and Fornax, we obtained the 1σ rms scatter from the FWHM of the histograms of metallicities presented by Tolstoy et al. (2004) and Battaglia et al. (2006), respectively.”
The DART Imaging And CaT Survey of the Fornax Dwarf Spheroidal Galaxy (2006, methodology): “Population gradients have been detected in several other dwarf spheroidal galaxies in the Local Group from imaging (e.g., Harbeck et al. 2001), and spectroscopy (e.g., Tolstoy et al. 2004).”
Chemical Abundance Distributions of Galactic Halos and Their Satellite Systems in a ΛCDM Universe (2005, background): “In contrast, metallicity data for dwarf galaxies in the Local Group (both satellites and in the field) are still sparse (see Grebel et al. 2003; Venn et al. 2004, and references therein), but recent and upcoming observations are aiming to bridge that gap (Kaufer et al. 2004; Tolstoy et al. 2004).”
One Law to Rule Them All: The Radial Acceleration Relation of Galaxies (2016, background): “Some dSphs, however, show chemo-dynamically distinct stellar components (Tolstoy et al. 2004; Battaglia et al. 2006): one can distinguish between a metal-rich (MR) and a metal-poor (MP) component with the former more centrally concentrated and kinematically colder than the latter.”
THE SAGITTARIUS DWARF GALAXY: A MODEL FOR EVOLUTION IN A TRIAXIAL MILKY WAY HALO (2010, background): “Motivated by the presence of such population gradients within other Galactic dSphs (e.g., Tolstoy et al. 2004) for which the more metal-rich populations are more centrally concentrated and have lower velocity dispersion, we tag particles in our best-fit model of the Sgr dwarf to correspond to…”
Velocity Dispersion Profiles of Seven Dwarf Spheroidal Galaxies (2007, background): “…Geha, M. 2007, astro-ph/0706.0516, 706 Strigari, L. E., Bullock, J. S., Kaplinghat, M., Diemand, J., Kuhlen, M., & Madau, P. 2007, ArXiv e-prints, 704 Tolstoy et al. 2004, ApJ, 617, L119 Vogt, S. S., Mateo, M., Olszewski, E. W., & Keane, M. J. 1995, AJ, 109, 151 Walker, M. G., Mateo, M.,…”
The Dynamical and Chemical Evolution of Dwarf Spheroidal Galaxies with GEAR (2009, methodology): “Evidence of stellar population segregation has been reported in Sculptor (Tolstoy et al. 2004), Fornax (Battaglia et al. 2006), and Sextans (Battaglia et al. 2011).”