VI photometry of sources in the halo of NGC253 Virtual Observatory Resource

Authors
  1. Bailin J.
  2. Bell E.F.
  3. Chappell S.N.
  4. Radburn-Smith D.J.
  5. de Jong R.S.
  6. Published by
    CDS
Abstract

We have obtained Magellan/IMACS and HST/ACS imaging data that resolve red giant branch stars in the stellar halo of the starburst galaxy NGC 253. The HST data cover a small area, and allow us to accurately interpret the ground-based data, which cover 30% of the halo to a distance of 30kpc, allowing us to make detailed quantitative measurements of the global properties and structure of a stellar halo outside of the Local Group. The geometry of the halo is significantly flattened in the same sense as the disk, with a projected axis ratio of b/a~0.35+/-0.1. The total stellar mass of the halo is estimated to be M_halo ~2.5+/-1.5x10^9^M_{sun}_, or 6% of the total stellar mass of the galaxy, and has a projected radial dependence that follows a power law of index -2.8+/-0.6, corresponding to a three-dimensional power law index of ~-4. The total luminosity and profile shape that we measure for NGC 253 are somewhat larger and steeper than the equivalent values for the Milky Way and M31, but are well within the scatter of model predictions for the properties of stellar halos built up in a cosmological context. Structure within the halo is seen at a variety of scales: there is small kpc-scale density variation and a large shelf-like feature near the middle of the field. The techniques that have been developed will be essential for quantitatively comparing our upcoming larger sample of observed stellar halos to models of halo formation.

Keywords
  1. Galaxies
  2. Photometry
  3. Infrared photometry
  4. Optical astronomy
  5. Giant stars
  6. Hertzsprung Russell diagram
Bibliographic source Bibcode
2011ApJ...736...24B
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/736/24
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/736/24
Document Object Identifer DOI
doi:10.26093/cds/vizier.17360024

Access

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https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/736/24
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/736/24
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https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/736/24/starcat?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/736/24/starcat?

History

2011-07-05T07:43:05Z
Resource record created
2011-07-05T07:43:05Z
Created
2011-07-05T07:43:27Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr