Confirmation of a faint red halo around NGC 5907

Details Confirmation of a faint red halo around NGC 5907 Confirmation of a faint red halo around NGC 5907

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.301..280j&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 301, Issue 1, pp. 280-284.

Astronomy and Astrophysics

Astronomy

17

Stars: Low-Mass, Brown Dwarfs, Galaxies: Haloes, Galaxies: Individual: Ngc 5907, Galaxies: Spiral, Dark Matter, Infrared: Galaxies

Scientific paper

We report the detection of extended infrared emission 5.2kpc above the plane of the edge-on spiral galaxy NGC 5907 in the JK bands. This provides confirmation at two other wavelengths of the R-band result of Sackett et al. The halo J-K colour is found to be 1.3+/-0.3. If we make the assumption that the halo emission is of the form necessary to give a flat rotation curve at large radii, with a power-law index in projection of -1.0, the K surface brightness, M/L_K ratio and R-K colour are found to be 23.0mag arcsec^-2, 100 and 3.5 respectively, at 95-arcsec radius. Adopting a halo index of -2.5 in projection, typical of known stellar haloes but inconsistent with the halo measured by Sackett et al., the K surface brightness at 95 arcsec drops to 24.0mag arcsec^-2 and the J-K colour to 2.5, while the M/L_K ratio is undetermined since such a halo would be unrelated to the dark matter component. If the emission is interpreted as arising from the massive halo, then it is broadly consistent with a population of stars at the very lowest masses, possibly extending into the brown dwarf regime.

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