Charles Beichman 1, George Helou 1, Dave Van Buren 1, Ken Ganga 1, & F.X. Désert 2
1 Infrared Processing and Analysis Center California Institute of Technology, Jet Propulsion Laboratory 2 Laboratoire d'Astrophysique de l'Observatoire de Grenoble, France
We present deep ISOCAM observations taken at 4.5 
(LW1) in
search of a faint halo surrounding the edge-on spiral galaxy NGC4565.
Such a halo might exist if the massive halo needed to explain the flat
rotation curve of this galaxy were attributable to a population of
faint, red objects. The upper limit, 8.1 kJy/sr (3 sigma), reported here
excludes a halo consisting of late M dwarfs but not of cooler, lower
luminosity brown dwarf stars.