Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mnras.415..993m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 415, Issue 2, pp. 993-1001.
Astronomy and Astrophysics
Astronomy
1
Galaxies: Formation, Galaxies: Haloes, Galaxies: Individual: Ngc 5128, Galaxies: Stellar Content
Scientific paper
We present an analysis of the spatial and chemical substructures in a remote halo field in the nearby giant elliptical galaxy Centaurus A (NGC 5128), situated ˜38 kpc from the centre of the galaxy. The observations were taken with the Advanced Camera for Surveys instrument on-board the Hubble Space Telescope, and reach down to the horizontal branch. In this relatively small 3.8 × 3.8 kpc2 field, after correcting for Poisson noise, we do not find any statistically strong evidence for the presence of small-scale substructures in the stellar spatial distribution on scales ≳100 pc. However, we do detect the presence of significant small spatial-scale inhomogeneities in the stellar median metallicity over the surveyed field. We argue that these localized chemical substructures could be associated with not fully mixed debris from the disruption of low-mass systems. NGC 5128 joins the ranks of the late-type spiral galaxies the Milky Way, for which the stellar halo appears to be dominated by small-scale spatial substructures, and NGC 891, where localized metallicity variations have been detected in the inner extraplanar regions. This suggests that the presence of small-scale substructures may be a generic property of stellar haloes of large galaxies. This work was based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.
Ibata Rodrigo
Mouhcine Mustapha
Rejkuba Marina
No associations
LandOfFree
Are small-scale substructures a universal property of galaxy haloes? The case of the giant elliptical NGC 5128 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Are small-scale substructures a universal property of galaxy haloes? The case of the giant elliptical NGC 5128, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Are small-scale substructures a universal property of galaxy haloes? The case of the giant elliptical NGC 5128 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1681693