A test of arm-induced star formation in spiral galaxies from near-IR and H$α$ imaging

Details A test of arm-induced star formation in spiral galaxies from near-IR and H$α$ imaging A test of arm-induced star formation in spiral galaxies from near-IR and H$α$ imaging

2002-08-21

arxiv.org/abs/astro-ph/0208401v1

Mon.Not.Roy.Astron.Soc. 337 (2002) 1113

Astronomy and Astrophysics

Astrophysics

6 pages, 1 figure, accpeted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.2002.06007.x

We have imaged a sample of 20 spiral galaxies in H$\alpha$ and in the near-infrared K band (2.2 um), in order to determine the location and strength of star formation in these objects with respect to perturbations in the old stellar population. We have found that star formation rates are significantly enhanced in the vicinity of K band arms. We have also found that this enhancement in star formation rate in arm regions correlates well with a quantity that measures the relative strengths of shocks in arms. Assuming that the K band light is dominated by emission from the old stellar population, this shows that density waves trigger star formation in the vicinity of spiral arms.

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