A low surface brightness halo surrounding the globular cluster NGC 5694

M. Correnti, M. Bellazzini, E. Dalessandro, A. Mucciarelli, L. Monaco, M. Catelan

Resultado de la investigación: Article

24 Citas (Scopus)

Resumen

We report on the discovery of an extended stellar halo surrounding the distant Galactic globular cluster NGC 5694, based on new deep (V≃ 24.5) wide-field (24 × 20arcmin2) photometry acquired with the VIMOS at the VLT. Stars with colour and magnitude consistent with the main sequence of the cluster are clearly identified out to r≃ 9arcmin(≃93pc) from the cluster centre, much beyond the tidal radius of the King model that best fits the inner profile (rt= 3.15arcmin). We do not find a clear end of the structure within our field. The overall observed profile cannot be properly fitted with either a King model, an Elson et al. model or a Wilson model; however, it is very smooth and does not show any sign of the break near the tidal radius that is typically observed in stellar systems with tidal tails. The density map we derived does not show evidence of tidal tails, within the considered field. The extra-tidal component contains ≃ 3.5 per cent of the cluster light (mass) and has a surface density profile falling as ~r-3.2. The possible origin of the detected structure is discussed, as a clear-cut conclusion cannot be reached with the available data.

Idioma originalEnglish
Páginas (desde-hasta)2411-2416
Número de páginas6
PublicaciónMonthly Notices of the Royal Astronomical Society
Volumen417
N.º4
DOI
EstadoPublished - nov 2011

Huella dactilar

globular clusters
halos
brightness
profiles
stellar systems
radii
falling
photometry
color
stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Correnti, M. ; Bellazzini, M. ; Dalessandro, E. ; Mucciarelli, A. ; Monaco, L. ; Catelan, M. / A low surface brightness halo surrounding the globular cluster NGC 5694. En: Monthly Notices of the Royal Astronomical Society. 2011 ; Vol. 417, N.º 4. pp. 2411-2416.
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abstract = "We report on the discovery of an extended stellar halo surrounding the distant Galactic globular cluster NGC 5694, based on new deep (V≃ 24.5) wide-field (24 × 20arcmin2) photometry acquired with the VIMOS at the VLT. Stars with colour and magnitude consistent with the main sequence of the cluster are clearly identified out to r≃ 9arcmin(≃93pc) from the cluster centre, much beyond the tidal radius of the King model that best fits the inner profile (rt= 3.15arcmin). We do not find a clear end of the structure within our field. The overall observed profile cannot be properly fitted with either a King model, an Elson et al. model or a Wilson model; however, it is very smooth and does not show any sign of the break near the tidal radius that is typically observed in stellar systems with tidal tails. The density map we derived does not show evidence of tidal tails, within the considered field. The extra-tidal component contains ≃ 3.5 per cent of the cluster light (mass) and has a surface density profile falling as ~r-3.2. The possible origin of the detected structure is discussed, as a clear-cut conclusion cannot be reached with the available data.",
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A low surface brightness halo surrounding the globular cluster NGC 5694. / Correnti, M.; Bellazzini, M.; Dalessandro, E.; Mucciarelli, A.; Monaco, L.; Catelan, M.

En: Monthly Notices of the Royal Astronomical Society, Vol. 417, N.º 4, 11.2011, p. 2411-2416.

Resultado de la investigación: Article

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AU - Bellazzini, M.

AU - Dalessandro, E.

AU - Mucciarelli, A.

AU - Monaco, L.

AU - Catelan, M.

PY - 2011/11

Y1 - 2011/11

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AB - We report on the discovery of an extended stellar halo surrounding the distant Galactic globular cluster NGC 5694, based on new deep (V≃ 24.5) wide-field (24 × 20arcmin2) photometry acquired with the VIMOS at the VLT. Stars with colour and magnitude consistent with the main sequence of the cluster are clearly identified out to r≃ 9arcmin(≃93pc) from the cluster centre, much beyond the tidal radius of the King model that best fits the inner profile (rt= 3.15arcmin). We do not find a clear end of the structure within our field. The overall observed profile cannot be properly fitted with either a King model, an Elson et al. model or a Wilson model; however, it is very smooth and does not show any sign of the break near the tidal radius that is typically observed in stellar systems with tidal tails. The density map we derived does not show evidence of tidal tails, within the considered field. The extra-tidal component contains ≃ 3.5 per cent of the cluster light (mass) and has a surface density profile falling as ~r-3.2. The possible origin of the detected structure is discussed, as a clear-cut conclusion cannot be reached with the available data.

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