Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...490..682t&link_type=abstract
Astrophysical Journal v.490, p.682
Astronomy and Astrophysics
Astronomy
32
Galaxies: Individual Ngc Number: Ngc 4414, Galaxies: Ism, Galaxies: Kinematics And Dynamics, Galaxies: Spiral, Galaxies: Stellar Content, Galaxies: Structure, Infrared: Galaxies
Scientific paper
We present new H alpha , CO, and H I images of the high gas surface density flocculent spiral NGC 4414 and compare them to recently published near-infrared observations that reveal kiloparsec-scale structures in the inner disk. The subtraction of an estimated supergiant contribution confirms that the near-infrared enhancements represent primarily variations in the surface density of the old stellar population. As material structures of kiloparsec extent cannot be maintained in a differentially rotating disk for sufficiently long times to be discernible in the old stellar population, the near-infrared observations suggest that global dynamical processes contribute to the formation of structure in NGC 4414. However, variations in the distribution of CO, H I, and H alpha peaks with respect to near-infrared "arm" structures suggest that stochastic processes are also important.
Mundy Lee G.
Thornley Michele D.
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