Abstract
We present a high-resolution, SparsePak two-dimensional velocity field
for the center of the low surface brightness (LSB) galaxy DDO 39. These
data are a significant improvement on previous H I or Hα long-slit
data, yet the inner rotation curve is still uncertain due to significant
noncircular and random motions. These intrinsic uncertainties, probably
present in other LSB galaxies too, result in a wide range of inner
slopes being consistent with the data, including those expected in cold
dark matter (CDM) simulations. The halo concentration parameter provides
a more useful test of cosmological models than the inner slope, as it is
more tightly constrained by observations. DDO 39's halo concentration
parameter is consistent with, but on the low end of, the distribution
predicted by CDM.
Original language | English |
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Pages (from-to) | L19-L22 |
Journal | The Astrophysical Journal |
Volume | 587 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1-Apr-2003 |
Externally published | Yes |
Keywords
- Galaxies: Dwarf
- Galaxies: Halos
- Galaxies: Kinematics and Dynamics