Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....118..261a&link_type=abstract
The Astronomical Journal, Volume 118, Issue 1, pp. 261-272.
Astronomy and Astrophysics
Astronomy
33
Cosmology: Dark Matter, Galaxies: Halos, Galaxies: Individual: Alphanumeric: Ic 5249, Galaxies: Photometry, Galaxies: Structure, Ism: H I
Scientific paper
Optical photometry and H I synthesis observations of the southern edge-on Sc/Sd galaxy IC 5249 are reported. The rotation curve rises linearly out to a radius of 7 kpc and then appears to flatten out at ~100 km s^-1. The H I mass out to 24.5 kpc is ~6x10^9 M_solar, or 10% of the total mass out to this radius. The color, central surface brightness, scale height, and scale length of the disk of IC 5249 are R-I~0.4, mu=20.6+/-0.1R_C mag arcsec^-2, 600+/-40 pc, and 11+/-2 kpc, respectively. Additional light to that predicted by an exponential disk is present at distances greater than 3 kpc from the disk. At 5 kpc the surface brightness is 27-28R_C mag arcsec^-2. The measured distribution of surface brightness is used to constrain the abundance of low-mass main-sequence stars in the halo of the galaxy. A halo made up entirely of main-sequence stars heavier than 0.13 M_solar is excluded. We also find that less than 20% of the halo can be composed of main-sequence stars heavier than 0.30 M_solar. Further observations are required to determine the rotation curve of IC 5249 to large radii and to determine precisely the abundance of low-mass main-sequence stars in the halo of the galaxy.
Abe FR.
Bond Ian A.
Carter B. S.
Dodd Robert J.
Fujimoto Minoru
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