Bibcode
Laine, S.; Knapen, J. H.; Pérez-Ramírez, D.; Doyon, R.; Nadeau, D.
Referencia bibliográfica
Astrophysics and Space Science, v. 276, Issue 2/4, p. 475-482 (2001).
Fecha de publicación:
3
2001
Revista
Número de citas
0
Número de citas referidas
0
Descripción
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 H_α 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.