Infrared photometry of the halo of M87

Details Infrared photometry of the halo of M87 Infrared photometry of the halo of M87

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265l..55b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 265, Feb. 15, 1983, p. L55-L59. NSF-supported research.

Astronomy and Astrophysics

Astrophysics

17

Astronomical Photometry, Elliptical Galaxies, Galactic Structure, Infrared Photometry, Infrared Spectroscopy, Star Distribution, Dark Matter, Data Processing, Density Distribution, Luminous Intensity, Main Sequence Stars, Mass To Light Ratios, Stellar Luminosity, X Ray Spectra

Scientific paper

K band (2.2 micron) photometry is reported for selected positions near the east-west axis of the giant elliptical galaxy M87. The data are consistent with B band profiles. The luminosity profile is compared with the density profile derived from X-ray measurements. If a correction is made for the light of the known stellar component, the remaining 'dark matter' has a mass-to-light ratio of M/L greater than 100 (2 sigma lower limit) in solar K band units. For comparison, the faintest known main-sequence star, VB 10, has a K band mass-to-light ratio of M/L = 34 and a visual band mass-to-light ratio of about 36,000.

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