Other
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.4002b&link_type=abstract
American Astronomical Society Meeting 204, #40.02; Bulletin of the American Astronomical Society, Vol. 36, p.716
Other
Scientific paper
We have used H- and K-band spectroscopy to investigate the nuclear stellar populations and star formation histories of a subsample of 41 bright spiral galaxies from an optically-selected sample (the ISO Atlas of Bright Spiral Galaxies). ˜80% of the sample have spectra that are essentially identical and that exhibit only absorption features characteristic of the atmospheres of late-type stars. We present a composite near-infrared spectrum that characterizes these "quiescent" galaxies. In the other ˜20% of the sample, we detect both this quiescent continuum and emission lines from HI (Brackett γ ), H2, and [FeII] that are indicative of recent bursts of star formation. The starbursts were detected only in Sbc and later-type galaxies, and most are barred or show evidence of recent interactions. The stellar populations are most consistent with instantaneous starbursts. While only ˜2% of the total nuclear stellar mass in these galaxies is due to these starbursts, we show how the nuclear stellar populations of normal spiral galaxies can be built up through a series of these bursts.
Bendo George J.
Joseph Robert D.
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