Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915128g&link_type=abstract
American Astronomical Society, AAS Meeting #219, #151.28
Astronomy and Astrophysics
Astronomy
Scientific paper
Observations of the nearby starburst galaxy NGC 4449 taken with the Chandra and Hubble Space Telescopes have led to the discovery of a population of very young (< 10 Myr), massive black-hole x-ray binaries located within or close to star clusters. We ran a suite of N-body simulations to determine whether these very young black-hole binaries could have formed purely through dynamical interactions in the dense cluster cores. Our simulated clusters all contain N=16,384 stars, and span a large range of initial sizes and density profiles, both with and without primordial mass segregation. These parameters cover clusters with properties similar to those of the x-ray binary hosts in NGC 4449, but also include more extreme stellar systems. Our main result is that x-ray binary candidates are only produced by such a young age in clusters with unrealistic initial conditions. Hence, the very young, black-hole x-ray binaries in NGC 4449 cannot have formed dynamically, but must have been present from the clusters' birth.
Chandar Rupali
Converse J.
Garofali Kristen
Rangelov Blagoy
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