An HST/ACS view of the inhomogeneous outer halo of M31
Identifieur interne : 007F27 ( Main/Exploration ); précédent : 007F26; suivant : 007F28An HST/ACS view of the inhomogeneous outer halo of M31
Auteurs : J. C. Richardson [Royaume-Uni] ; A. M. N. Ferguson [Royaume-Uni] ; A. D. Mackey [Royaume-Uni] ; M. J. Irwin [Royaume-Uni] ; S. C. Chapman [Royaume-Uni] ; A. Huxor ; R. A. Ibata [France] ; G. F. Lewis [Australie] ; N. R. TanvirSource :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2009-07-11.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
- Abundance mixture, Average metallicity, Besancon model, Cmds, Color-magnitude diagrams, Dartmouth isochrones, Discrete substructures, Dominant peak, Dominant populations, Ec2f, Ec4f, Eld, Faint magnitudes, Foreground, Foreground population, Foreground stars, Fusi pecci, Galaxies, Galaxy, Galaxy evolution, Galaxy formation, Galaxy halo, Galaxy structure, Gc4f, Giant branch, Giant stream progenitor, Globular clusters, Good agreement, Halo, Halo stars, High metallicities, Horizontal branch, Hubble space camera, Ibata, Inner halo, Intermediate metallicities, Irwin, Isochrone, Journal compilation, Koch, Large fraction, Lower limit, Lucia helmi, Mcconnachie, Mdfs, Metal-poor stars, Metallicities, Metallicity, Metallicity determination, Metallicity dispersions, Metallicity distribution functions, Milky Way, Mnras, More metal, Outer halo, Photometric, Photometric depth, Photometric metallicities, Radial distance, Radial gradient, Radial range, Red giant stars, Satellite accretion, Solar abundance, Spectroscopic, Spectroscopic metallicities, Spectroscopic studies, Standard deviation, Star clusters, Star counts, Stellar, Stellar content, Stellar distribution, Stellar halo, Stellar haloes, Stellar population, Stellar populations, Stream debris, Substructure, Tanvir, Theoretical isochrones, Tidal radius, Unbiased probes, Unresolved background galaxies.
- Teeft :
- Abundance mixture, Average metallicity, Besancon model, Cmds, Dartmouth isochrones, Discrete substructures, Dominant peak, Dominant populations, Ec2f, Ec4f, Eld, Faint magnitudes, Foreground, Foreground population, Foreground stars, Fusi pecci, Galaxy, Gc4f, Giant branch, Giant stream progenitor, Good agreement, Halo, Halo stars, High metallicities, Horizontal branch, Hubble space camera, Ibata, Inner halo, Intermediate metallicities, Irwin, Isochrone, Journal compilation, Koch, Large fraction, Lower limit, Lucia helmi, Mcconnachie, Mdfs, Metallicities, Metallicity, Metallicity determination, Metallicity dispersions, Metallicity distribution functions, Mnras, More metal, Outer halo, Photometric, Photometric depth, Photometric metallicities, Radial distance, Radial gradient, Radial range, Satellite accretion, Spectroscopic, Spectroscopic metallicities, Spectroscopic studies, Standard deviation, Star counts, Stellar, Stellar distribution, Stellar halo, Stellar haloes, Stellar populations, Stream debris, Substructure, Tanvir, Theoretical isochrones, Tidal radius, Unbiased probes, Unresolved background galaxies.
Abstract
We present a high precision photometric view of the stellar populations in the outer halo of M31, using data taken with the Hubble Space Telescope/Advanced Camera for Surveys. We analyse the field populations adjacent to 11 luminous globular clusters which sample the galactocentric radial range 18 ≲R≲ 100 kpc and reach a photometric depth of ∼2.5 mag below the horizontal branch (mF814W∼ 27 mag). The colour–magnitude diagrams are well populated out to ∼60 kpc and exhibit relatively metal‐rich red giant branches, with the densest fields also showing evidence for prominent red clumps. We use the Dartmouth isochrones to construct metallicity distribution functions which confirm the presence of dominant populations with 〈[Fe/H]〉≈−0.6 to −1.0 dex and considerable metallicity dispersions of 0.2 to 0.3 dex (assuming a 10 Gyr population and scaled‐solar abundances). The average metallicity over the range 30–60 kpc is [Fe/H]=−0.80 ± 0.14 dex, with no evidence for a significant radial gradient. Metal‐poor stars ([Fe/H]≤−1.3) typically account for ≲10–20 per cent of the population in each field, irrespective of radius. Assuming our fields are unbiased probes of the dominant stellar populations in these parts, we find that the M31 outer halo remains considerably more metal rich than that of the Milky Way out to at least 60 kpc.
Url:
- https://api.istex.fr/document/3DF99DF5C1A2B4C07DFF156E5D3FACFCE23B99AD/fulltext/pdf
- https://api.istex.fr/document/CD2260471060140AF45476D44A32FA041B1175F1/fulltext/pdf
DOI: 10.1111/j.1365-2966.2009.14788.x
Affiliations:
- Australie, France, Royaume-Uni
- Angleterre, Angleterre de l'Est, Nouvelle-Galles du Sud, Écosse
- Cambridge, Sydney, Édimbourg
- Université d'Édimbourg, Université de Cambridge, Université de Sydney
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<front><div type="abstract" xml:lang="en">We present a high precision photometric view of the stellar populations in the outer halo of M31, using data taken with the Hubble Space Telescope/Advanced Camera for Surveys. We analyse the field populations adjacent to 11 luminous globular clusters which sample the galactocentric radial range 18 ≲R≲ 100 kpc and reach a photometric depth of ∼2.5 mag below the horizontal branch (mF814W∼ 27 mag). The colour–magnitude diagrams are well populated out to ∼60 kpc and exhibit relatively metal‐rich red giant branches, with the densest fields also showing evidence for prominent red clumps. We use the Dartmouth isochrones to construct metallicity distribution functions which confirm the presence of dominant populations with 〈[Fe/H]〉≈−0.6 to −1.0 dex and considerable metallicity dispersions of 0.2 to 0.3 dex (assuming a 10 Gyr population and scaled‐solar abundances). The average metallicity over the range 30–60 kpc is [Fe/H]=−0.80 ± 0.14 dex, with no evidence for a significant radial gradient. Metal‐poor stars ([Fe/H]≤−1.3) typically account for ≲10–20 per cent of the population in each field, irrespective of radius. Assuming our fields are unbiased probes of the dominant stellar populations in these parts, we find that the M31 outer halo remains considerably more metal rich than that of the Milky Way out to at least 60 kpc.</div>
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