An infrared search for massive galactic envelopes

Astronomy and Astrophysics – Astronomy

Scientific paper

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Disk Galaxies, Galactic Structure, Infrared Astronomy, Intergalactic Media, Late Stars, Main Sequence Stars, Astronomical Photometry, Brightness, Dark Matter, Dwarf Stars, Stellar Envelopes

Scientific paper

Point photometry was performed in the infrared J (1.25 microns) and K (2.2 microns) bands on four disk galaxies: two edge-on S0 galaxies (NGC 2768 and NGC 4762), a nearly face-on S0 (NGC 4203), and an edge-on SAb (NGC 4565). The objective was to determine if the massive envelopes (or halos) which are thought to surround disk galaxies might be composed of late-type main sequence stars. The observations are consistent with the hypothesis that most of the dark matter surrounding visible galactic disks is not in the form of late-type stars. On the basis of B-J and V-J colors, it is found that main sequence stars of spectral type M5 and later cannot be an important constituent of the outer region of these disks.

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