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More Images of M15
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Neutron Star X-ray binary systems in
the globular cluster M15
This Chandra image, with a scale bar, shows two
neutron star X-ray binary systems 2U2127 and M15 X-2 in
the globular cluster M15. Their proximity on the sky
made it impossible for previous X-ray telescopes to
resolve the individual sources.
(Credit: NASA/GSFC/N.White,
L.Angelini )
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Hubble Space Telescope Image of
central region of M15
This Hubble "Wide Field Planetary Camera 2" image
reveals the central region of the globular cluster M15.
Here we see the core, with about a thousand stars
confined within the innermost 1.6 light years of the
cluster. Images in ultraviolet, blue, and visual light
were combined for this picture so that the colors
roughly correspond to the surface temperatures of stars
in M15. Hot stars appear blue, while cooler stars
appear reddish-orange.
(Credit:NASA/HST -- P.
Guhathakurta (UCO/Lick Observatory, UC Santa Cruz), B.
Yanny (Fermi National Accelerator Lab), D. Schneider
(Pennsylvania State Univ.), J. Bahcall (Inst. for
Advanced Study))
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Annotated Hubble Space Telescope
Image of Central Region of M15
The Chandra observation involves two X-ray binary
systems: One contains neutron star 4U2127 orbiting
around normal star AC211, the latter of which can be
seen as a blue star in this Hubble image. The other
binary contains the newly named M15-X2 neutron star,
likely associated with a second, unnamed blue star. The
Hubble image had the necessary resolution to clearly
differentiate between the two optical stars, yet could
not identify neutron star binary systems, which are
visible in X-rays.
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Chandra X-ray Image with Scale
Bar
Scale bar = 5 arcsec
Credit: NASA/GSFC/N.White,
L.Angelini
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Return to M15 (06 Sep 01)
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