A Faint Luminous Halo that May Trace the Dark Matter around Spiral Galaxy NGC~5907

Details A Faint Luminous Halo that May Trace the Dark Matter around Spiral Galaxy NGC~5907 A Faint Luminous Halo that May Trace the Dark Matter around Spiral Galaxy NGC~5907

1994-07-22

arxiv.org/abs/astro-ph/9407068v1

Nature 370 (1994) 441

Astronomy and Astrophysics

Astrophysics

9 pages, uuencoded, compressed, tar file. Institute for Advanced Study number AST 94/35

Scientific paper

10.1038/370441a0

The presence of unseen halos of ``dark matter'' has long been inferred from the high rotation speeds of gas and stars in the outer parts of spiral galaxies$^{1}$. The volume density of this dark matter decreases less quickly from the galactic center than does that of the luminous mass (such as that in stars), meaning that the dark matter dominates the mass far from the center$^{1,2}$. While searching for faint starlight away from the plane of the edge-on disk galaxy \gal$^{3}$, we have found that the galaxy is surrounded by a faint luminous halo. The intensity of light from this halo falls less steeply than any known luminous component of spiral galaxies, but is consistent with the distribution of dark mass inferred from the galaxy's rotation curve.

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