Grand-Design Spirals in the Core of NGC 5248 |
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| Authors: | S Laine JH Knapen D Pérez-Ramírez R Doyon D Nadeau |
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| Institution: | (1) Department of Physical Sciences, University of Hertfordshire, College Lane, Hatfield, Herts., AL10 9AB, United Kingdom;(2) Observatoire du Mont Mégantic and Département de Physique, Université de Montréal, C.P. 6128, Succursale Centre Ville, Montréal, QC, H3C 3J7, Canada |
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| Abstract: | We report the detection of a bisymmetric nuclear spiral structure in the spiral galaxy NGC 5248.The two red spiral arms can
be followed for about 3 arcsec, before they appear to end inside the radius of the circumnuclear starburst `ring' at about
5.5 arcsec or 400 pc distance from the nucleus. We combine our near-infrared Canada–France–Hawaii Telescope adaptive optics
images with traditional near-infrared and optical images and show that spiral structure is present in this galaxy at spatial
scales reaching from a hundred parsecs to 15 kpc. Comparison with a Hubble Space Telescope ultraviolet image shows how the
starburst ring is related to the nuclear spiral structure. We also show a two-dimensional Hα velocity field that reveals no evidence for systematic streaming motions near the nuclear spiral or the starburst ring, nor
for a rapidly rising rotation curve.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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