The postcollapse core of M15 imaged with the HST planetary camera

Details The postcollapse core of M15 imaged with the HST planetary camera The postcollapse core of M15 imaged with the HST planetary camera

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...369l..45l&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 369, March 10, 1991, p. L45-L49.

Astronomy and Astrophysics

Astrophysics

73

Astronomical Photometry, Globular Clusters, Gravitational Collapse, Dark Matter, Hubble Space Telescope, Main Sequence Stars, Point Spread Functions, Stellar Evolution

Scientific paper

It is shown here that, despite the severe spherical aberration present in the HST, the Wide Field/Planetary Camera (WFPC) images still present useful high-resolution information on M15, the classic candidate for a cluster with a collapsed core. The stars in M15 have been resolved down to the main-sequence turnoff and have been subtracted from the images. The remaining faint, unresolved stars form a diffuse background with a surprisingly large core with r(c) = 0.13 pc. The existence of a large core interior to the power-law cusp may imply that M15 has evolved well past maximum core collapse and may rule out the presence of a massive central black hole as well.

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