12
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: not found
      • Article: not found

      The distribution of stars around the Milky Way’s central black hole : III. Comparison with simulations

      , ,
      Astronomy & Astrophysics
      EDP Sciences

      Read this article at

      ScienceOpenPublisher
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Related collections

          Most cited references58

          • Record: found
          • Abstract: not found
          • Article: not found

          The structure of star clusters. III. Some simple dvriamical models

          Ivan King (1966)
            Bookmark
            • Record: found
            • Abstract: not found
            • Article: not found

            Star distribution around a massive black hole in a globular cluster

              Bookmark
              • Record: found
              • Abstract: found
              • Article: found
              Is Open Access

              On the variation of the Initial Mass Function

              (shortened) In this contribution an average or Galactic-field IMF is defined, stressing that there is evidence for a change in the power-law index at only two masses: near 0.5 Msun and 0.08 Msun. Using this supposed universal IMF, the uncertainty inherent to any observational estimate of the IMF is investigated, by studying the scatter introduced by Poisson noise and the dynamical evolution of star clusters. It is found that this apparent scatter reproduces quite well the observed scatter in power-law index determinations, thus defining the fundamental limit within which any true variation becomes undetectable. Determinations of the power-law indices alpha are subject to systematic errors arising mostly from unresolved binaries. The systematic bias is quantified here, with the result that the single-star IMFs for young star-clusters are systematically steeper by d_alpha=0.5 between 0.1 and 1 Msun than the Galactic-field IMF, which is populated by, on average, about 5 Gyr old stars. The MFs in globular clusters appear to be, on average, systematically flatter than the Galactic-field IMF, and the recent detection of ancient white-dwarf candidates in the Galactic halo and absence of associated low-mass stars suggests a radically different IMF for this ancient population. Star-formation in higher-metallicity environments thus appears to produce relatively more low-mass stars.
                Bookmark

                Author and article information

                Journal
                Astronomy & Astrophysics
                A&A
                EDP Sciences
                0004-6361
                1432-0746
                January 2018
                December 22 2017
                January 2018
                : 609
                : A28
                Article
                10.1051/0004-6361/201730462
                9230d6f3-e005-4a70-9f51-b26abf239d8c
                © 2018
                History

                Comments

                Comment on this article