Bibcode
Knapen, J. H.; James, P. A.
Bibliographical reference
Pathways Through an Eclectic Universe ASP Conference Series, Vol. 390, proceedings of the conference held 23-27 April, 2007 at Santiago del Teide, Tenerife, Spain. Edited by J. H. Knapen, T. J. Mahoney, and A. Vazdekis San Francisco: Astronomical Society of the Pacific, 2008., p.188
Advertised on:
6
2008
Citations
0
Refereed citations
0
Description
We present results derived from Hα images of 327 local galaxies
from the HaGS (Hα Galaxy Survey), where we have correlated the
star formation rates with the interaction characteristics of the
galaxies. We see a significant increase in the star formation rate in
galaxies with close neighbors, an increase which has probably been
triggered by galaxy-galaxy interactions. But when we analyze the
equivalent width of the Hα emission, which is the Hα flux
normalized by the continuum emission, or a measure of the current
compared to the average past star formation rate, we find that galaxies
with close companions show no significant enhancement at all. Our
conclusion is that although close neighbors and interactions increase
the star formation rate, they do this continuously. When we define a
starburst as a star formation event with a star formation rate that is
currently higher than it has been on average in the past, we must thus
conclude that the presence of a close companion does not lead to
starburst activity.