An INFRARED SPACE OBSERVATORY Upper Limit to the Low-Mass Star Halo in the Edge-on Galaxy NGC 4565

Details An INFRARED SPACE OBSERVATORY Upper Limit to the Low-Mass Star Halo in the Edge-on Galaxy NGC 4565 An INFRARED SPACE OBSERVATORY Upper Limit to the Low-Mass Star Halo in the Edge-on Galaxy NGC 4565

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...523..559b&link_type=abstract

The Astrophysical Journal, Volume 523, Issue 2, pp. 559-565.

Astronomy and Astrophysics

Astronomy

5

Galaxies: Halos, Galaxies: Individual (Ngc 4565), Galaxies: Stellar Content, Infrared: Galaxies

Scientific paper

We present deep ISOCAM observations taken at 4.5 μm (LW1) in search of a faint halo surrounding the edge-on spiral galaxy NGC 4565. Such a halo might exist if the massive halo that is needed to explain the flat rotation curve of this galaxy were attributable to a population of faint, red objects. The upper limit, 5.4 kJy sr^-1 (3 sigma) at 20 kpc, reported here excludes a halo consisting of late-M dwarfs distributed in a spherical halo but not of lower luminosity brown dwarf stars.

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