Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/1168
Title: Kinematics of two dwarf galaxies in the NGC 6946 group
Authors: Begum, A
Chengalur, J. N
Keywords: galaxies
dwarf -- Galaxy
kinematics and dynamics -- galaxies
individual: KK98 250 -- galaxies
individual: KK98 251 -- radio lines
galaxies -- cosmology
dark matter
Issue Date: 2004
Publisher: EDP Sciences
Citation: Astronomy and Astrophysics, Vol. 424, pp. 509-517
Abstract: We present high velocity resolution (~ 1.6 km s -1) Giant Meterwave Radio Telescope (GMRT) HI 21 cm synthesis images of the dwarf galaxies KK98 250 and KK98 251, as well as optical broad band images of KK98 250. We find that, despite being faint (M/subB/ < -14), both galaxies have regular velocity fields. In both cases the velocity fields are consistent with rigid body rotation. We derive rotation curves for the galaxies and fit mass models to them. For both galaxies, we find acceptable fits using isothermal halos while NFW halos provide a poor fit. Finally, we compile from literature a sample of galaxies with HI synthesis observations and I band magnitudes. From this sample we find, in agreement with earlier studies (which used single dish HI data), that dwarf galaxies tend to lie below the I band Tully-Fisher relation defined by brighter galaxies
URI: http://hdl.handle.net/2248/1168
Appears in Collections:Publications based on data from IAO, Hanle

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