A CCD morphological study of the starburst galaxy NGC 7552

Details A CCD morphological study of the starburst galaxy NGC 7552 A CCD morphological study of the starburst galaxy NGC 7552

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...239...90f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 239, no. 1-2, Nov. 1990, p. 90-96. Research supported by CONICET.

Astronomy and Astrophysics

Astrophysics

10

Astronomical Photometry, Charge Coupled Devices, Galactic Structure, Starburst Galaxies, Color, Cosmic Dust, Far Infrared Radiation, Galactic Nuclei, H Ii Regions

Scientific paper

This paper presents a morphological study of the starburst galaxy NGC 7552 based on image filtering and color mapping techniques. The galaxy exhibits the following features: (1) a prominent bar and two dominant outer arms that coexist with faint annular structures (resonance rings), (2) giant H II regions located at the corotation radius, and (3) a conspicuous dust ring that confines the nuclear H II region and emits most of the far infrared flux. The integrated colors of the different sub-systems are analyzed in an attempt to describe the dominant stellar populations. The presence of an extended dust cloud, not aligned with the bar, suggests a probably recent accretion time and that, perhaps, is connected with the feeding mechanism for the observed starburst.

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