Journal Article

Mass models from high-resolution H <span class="smallCaps">i</span> data of the dwarf galaxy NGC 1560

G. Gentile, M. Baes, B. Famaey and K. Van Acoleyen

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 406, issue 4, pages 2493-2503
Published in print August 2010 | ISSN: 0035-8711
Published online August 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16838.x
Mass models from high-resolution H i data of the dwarf galaxy NGC 1560

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We present H i observations performed at the Giant Metrewave Radio Telescope (GMRT) of the nearby dwarf galaxy NGC 1560. This Sd galaxy is well known for a distinct ‘wiggle’ in its rotation curve. Our new observations have twice the resolution of the previously published H i data. We derived the rotation curve by taking projection effects into account, and we verified the derived kinematics by creating model data cubes. This new rotation curve is similar to the previously published one: we confirm the presence of a clear wiggle. The main differences are in the innermost ∼100 arcsec of the rotation curve, where we find slightly (≲5 km s−1) higher velocities. Mass modelling of the rotation curve results in good fits using the core-dominated Burkert halo (which however does not reproduce the wiggle), bad fits using the a Navarro, Frenk & White halo, and good fits using Modified Newtonian Dynamics (MOND), which also reproduces the wiggle.

Keywords: gravitation; galaxies: individual: NGC 1560; galaxies: kinematics and dynamics; galaxies: spiral; dark matter

Journal Article.  4901 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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