INVESTIGADORES
CELLONE Sergio Aldo
artículos
Título:
The peculiar morphology of the irregular galaxy NGC 1427A
Autor/es:
CELLONE, S. A.; FORTE, J. C.
Revista:
ASTRONOMICAL JOURNAL
Editorial:
The American Astronomical Society
Referencias:
Año: 1997 vol. 113 p. 1239 - 1249
ISSN:
0004-6256
Resumen:
Multicolor surface photometry and fragmentary low-resolution
spectroscopy of the irregular galaxy NGC 1427A are presented. This
galaxy, a member of the Fornax Cluster, has not been studied in detail
previously. It shows a very distinctive morphology: a low surface
brightness stellar background with several bright knots forming a
distorted ring-like structure. A faint plume and several diffused
filaments connect the northern part of the main body of the galaxy with
an object having elliptical isophotes. The overall aspect of NGC 1427A,
then, resembles that of known interacting galaxies. The very blue colors
of the bright knots show that they are composed by young stars, and
several of them also show emission lines. The northern object, which has
itself a couple of these blue knots, is bluer than the background of the
main body of the galaxy. This fact indicates that the star formation
histories in both objects have been different. Morphologically, the
northern object is similar to the numerous dwarf elliptical or irregular
galaxies that populate the Fornax Cluster. The possibility of an
interaction being the cause of the particular structure of this galaxy
is discussed.